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View Full Version : JRC Carbs. Any Good?



justice66
09-01-2010, 8:57 PM
Thinking about putting a JRC carb on my triumph anyone have any complaints about them? I know its a triumph and came with an amal but my amal is garbage and i dont want to fix it or buy a new one.

justice66
09-01-2010, 8:58 PM
I also dont like ticklers leaking gas on my engine case

Torch
09-01-2010, 9:34 PM
I also dont like ticklers leaking gas on my engine case

and I don't like the PWK carbs.

TigerChris
09-01-2010, 10:30 PM
http://i81.photobucket.com/albums/j204/ceason/Triumph%20Build/DSCN3116.jpg?t=1283401258

You mean these? I hate em too, the only thing good about em is they're $100, my bike starts first kick, they don't leak everywhere, They have a real choke, there easy to tune, easy to balance/stay balanced, they never wear out, they look trick, make great power, idle smooth, they have chrome flatslides, and there the best carbs you can put on your triumph... Other than that, they suck balls.

fozz
09-01-2010, 11:09 PM
if you recomend em tiger , thats good enough fa me to stay well away from em by the way whats your thoughts on drilling holes in your tyre to lighten em, just pullin ya tail

Gepetto
09-01-2010, 11:51 PM
The jrc carbs are just that, a CHEAP carb!! I know that they are cheaper than Amal carbs and they don't wear out after 40 YEARS of use like Amals, and they don't leak gas out of the tickler hell they don't have ticklers they have chokes. But you do give up low end performance, sure you pick some up at the top end but how often are you riding at 6000 rpm? We service/build alot of bikes, at least 30 brit bikes at any given time in the shop, that being said we strongly suggest that customers don't waste there money on them. Even with old Amals on a bike you will notice a loss of torque at the low end, not just hear say but fact! As far as looking trick, they look as out of place as fake tits on a 12 year old.

justice66
09-02-2010, 7:16 AM
Haha sounds like they are pretty easy to set up and use and im not too concerned about the original look because i kinda hardtailed the bike anyways.

Torch
09-02-2010, 8:47 AM
If you are on a budget and can't afford Amals then buy the JRC carbs, if those carbs are defective then JRC will send you another set. think about it, if you paid $100 retail, and everyone connected with them makes the normal markup then somewhere in China they cost about $3.00 to make..... I'm sure you will be fine.
Do some subject searching on PWK or JRC carbs on this and other motorcycle journals and then make your decision.
they are an very affordable alternative carburetor, and like many new products they will need to pass the test of time. Amals only last about 40 years then you will need to replace them.
Note* there is no choke on PWK's, they have "enrichment circuit" for starting, the difference is Amals have a tickler for starting and a choke for cold engine operation.
and PWK's still only cost $100 even after someone hand glues the mounting flange on it.

TigerChris
09-02-2010, 12:04 PM
The jrc carbs are just that, a CHEAP carb!! I know that they are cheaper than Amal carbs and they don't wear out after 40 YEARS of use like Amals, and they don't leak gas out of the tickler hell they don't have ticklers they have chokes. But you do give up low end performance, sure you pick some up at the top end but how often are you riding at 6000 rpm? We service/build alot of bikes, at least 30 brit bikes at any given time in the shop, that being said we strongly suggest that customers don't waste there money on them. Even with old Amals on a bike you will notice a loss of torque at the low end, not just hear say but fact! As far as looking trick, they look as out of place as fake tits on a 12 year old.

I haven't heard that changing the carbs will change torque on any machine, do you have a reference? dyno? I'm interested. I do know that switching from single to twin carbs will reduce throttle response and torque due to pulsation at low rpm's (can be countered by utilizing a large balancing tube) Is that what you meant?

fozz
09-02-2010, 12:55 PM
refer to the the seat of your pants , ya can feel the diff way the bike runs who the hells gonna pay 100 s fa dyno runs to check on a 100 dollar carb , did ya dyno run ya gearbox cam plate mod

CRFyou
09-02-2010, 1:57 PM
As far as looking trick, they look as out of place as fake tits on a 12 year old.

please leave my girlfriend out of this argument. she is young and doesn't have tits yet, so i hooked her up.

as far as carbs go, my monoblock was worn to shit on my '59 and i replaced it with a 41 year old amal 930 and now that shit runs like 3 crotch rockets.

amals are great, simple, easy to tune carbs if they're in shape. there's just a fuel and idle screw for christ's sake.

the only thing easier and sweeter than an amal carb is gepetto's sweet ass.

KT
09-02-2010, 4:24 PM
+5 on amal's ....389's and 930's anyways ...My brother put a set of PWKs on his 79 and hated them ...

Torch
09-02-2010, 10:52 PM
refer to the the seat of your pants , ya can feel the diff way the bike runs who the hells gonna pay 100 s fa dyno runs to check on a 100 dollar carb , did ya dyno run ya gearbox cam plate mod

we actually do have dyno print outs showing the difference in torque readings from Amals over Makuni's, the Mikuni had a little better max RPM HP figure but the torque was down through the most of the pull,
This is one advantage to having a Super Flow Dyno right next door, we get to use the dyno for full speed shake down runs, motor break in's as well as tuning runs.
This has been an on-going argument with Mikunis and Amal's but recently had a customer that bought a bike on Ebay with PWK's on it, it ran well and started easily but he didn't like the way it looked so we removed the PWK's and installed a set of Amals, it made a noticeable difference,
Most old timers (myself included) will tell you just switch out the carbs and you will feel the difference.
the Amal carb is a simple old design that does not have an intermediate fuel circuit like the Makuni or the Kehin-PWK has, It's possible somewhere in there is where torque difference comes from.

Gepetto
09-03-2010, 1:50 AM
the only thing easier and sweeter than an amal carb is gepetto's sweet ass.[/QUOTE]

Awe Brandon that's the sweetest thing you've ever said to me! I wish I knew how to quit you!

TigerChris
09-03-2010, 7:16 PM
Torch is your shop in NJ? (nm i see your in CA) If so i'll get my clutch to stop slipping and we can blow it up on the dyno.
130 MPH last night before the clutch started slipping at 7000 rpm

oh the PWK's are Keihin not mikuni. mikuni's suck, early 1980's design round slide crap.

fozz
09-03-2010, 7:54 PM
im impressed maybe , but whats it do on the road with your ass on it ???????????????? thats the $64000 question

Torch
09-03-2010, 7:54 PM
Torch is your shop in NJ? (nm i see your in CA) If so i'll get my clutch to stop slipping and we can blow it up on the dyno.
130 MPH last night before the clutch started slipping at 7000 rpm

oh the PWK's are Keihin not mikuni. mikuni's suck, early 1980's design round slide crap.

sorry man we only use the flat slide Mikuni's but you know everything don't you.
guess what if you can do a timed 130mph then you are just wipped the asses of decades old engine builders at Bonneville and Murlock dry lakes and on your very first Triumph engine build and with stock valves too.
go put it on a dyno dial in a 15% wind resistance and do a print out like the big boys do
Sorry I ain't buying your wobbly needle speedometer readings

TigerChris
09-03-2010, 9:41 PM
sorry man we only use the flat slide Mikuni's but you know everything don't you.
guess what if you can do a timed 130mph then you are just wipped the asses of decades old engine builders at Bonneville and Murlock dry lakes and on your very first Triumph engine build and with stock valves too.
go put it on a dyno dial in a 15% wind resistance and do a print out like the big boys do
Sorry I ain't buying your wobbly needle speedometer readings

Dude I don't give a fuck what you put on anything, PWK's are Keihin not Mikuni.

I't was wobbling between 140ish and 120ish so i averaged it out

fozz
09-03-2010, 9:59 PM
Dude I don't give a fuck what you put on anything, PWK's are Keihin not Mikuni.

I't was wobbling between 140ish and 120ish so i averaged it out

Hell dude ya got something right PWK s are Keihin i got that by googlin to lets see thats ... now if your bikes standard gearing which is 648 rpm fa 10 mph 7000 rpm is 110 mph not 130 mph , 130 mph is 8500 or close enough

TigerChris
09-03-2010, 10:08 PM
Hell dude ya got something right PWK s are Keihin i got that by googlin to lets see thats ... now if your bikes standard gearing which is 648 rpm fa 10 mph 7000 rpm is 110 mph not 130 mph , 130 mph is 8500 or close enough

Thats good math dude, now bump it up from a 19 to a 22 tooth front sprocket, and i'm not even counting the larger back tire...

Torch
09-03-2010, 10:18 PM
Dude I don't give a fuck what you put on anything, PWK's are Keihin not Mikuni.

I't was wobbling between 140ish and 120ish so i averaged it out

and in your infinite wisdom you are going to say the Triumph speedo is ok to use for speed certification.... man, you have got to be kidding ..Right?

go to Bonneville someday and see how many Mikuni carbs on bikes you see and then how many PWK's you see. you may see some of the Keihin FCR carbs but not the budget Keihin PWK model.
Next to fuel injection the Flat slide Makuni is about as good as it gets for race bikes.

fozz
09-03-2010, 10:39 PM
Thats good math dude, now bump it up from a 19 to a 22 tooth front sprocket, and i'm not even counting the larger back tire...

maths are spot on 22 tooth 7000 130 mph but from experience 22 tooth youd lucky to go over 6000 rpm on the road , hey im a triumph man from way back but im also a realist ive had my bonnie up to 112 on the road guenuine an its a freaky experience , im not one fa dynos ect to show what a bike can do its the road that counts , you add 80 kg of rider you gonna lose 8 mph top end or so

TigerChris
09-03-2010, 10:48 PM
Torch, so lemmie break down this thread dude cause its gettin messy here
Dude, Are PWK's good?
You, NO
ME, yes
Someone else, amals make better torque
ME, Prove it,
You, I have a dyno Mikunis make mor HP but amals make more torque
ME, we're talking about PWK's right? Cuz I went 130MPH on my pwk's
You, GO TO BONERVILLE N SEE HOW MANY MAKUNIS THERE ARE

Are you fucking senile? no one said a fucking thing about mikunis cept' you
Who gives a fucking shit about mikunis?

Torch
09-03-2010, 11:06 PM
Chris, if you think you already know everything you are never going to learn anything new.

as you get older you will learn that experience is the antidote to theory.

talk to Hoofharted or Wes White or Wink Eller or some of the other motorcycle guys that have experience with going fast and you might learn something.

I test rode a bike this week down a residential street and the speedo was bouncing between 30 mph and 150 mph.... so you say I was doing about 75 right?

fozz
09-03-2010, 11:18 PM
This is getting messy me i think the proofs in the pudding . they told burt munroe his old indian wouldnt do what it did , he didnt listen an did it .
Chris id sugest you go ta speed week an prove us wrong if ya do ill buy ya a beer dont take this personal but over here we got a saying" put up or shut up " now personaly i like to be proven wrong not just told i am

CRFyou
09-04-2010, 5:37 AM
this is like, intelligent, awesome arguing!

i love it!

unit650
09-05-2010, 3:43 PM
just put one on my tiger had a mikuni ,which was to big the jrc is purring like a kitten and it also comes with several jets for fine tuning.

Torch
09-06-2010, 10:18 AM
certainly, if you remove an old set of worn out Amals and put a set of PWK's on there you are going to like the way it runs.
But if you remove a set of PWK's and put a brand new set of Amal's on you will notice an improvement in power at lower rpm.
We have switched brand new Amal's for Both Mikuni's and the PWK's and it is a noticeable difference.
say what ever you want until you do it.

KT
09-06-2010, 11:27 AM
My 650 does 120mph in the 1/4 never mind my speedo ratio is off it still says I did 120 I'm sticking to it =) ...

Seriously we are talking almost 60 year old technology it's only gonna get as good as it gets pretty much anything you can think of is or has been done ....Once when I was about 15 or 16 years old my buddy tried to tell me he invented doggy style ....Just cause it was new to him he thought no one had ever nailed a girl from behind ...this conversation is kind of like that one...

CRFyou
09-06-2010, 11:41 AM
My 650 does 120mph in the 1/4 never mind my speedo ratio is off it still says I did 120 I'm sticking to it =) ...

Seriously we are talking almost 60 year old technology it's only gonna get as good as it gets pretty much anything you can think of is or has been done ....Once when I was about 15 or 16 years old my buddy tried to tell me he invented doggy style ....Just cause it was new to him he thought no one had ever nailed a girl from behind ...this conversation is kind of like that one...

your shit is weak bro. 120 on a triumph isn't shit. i can do that in the 1/8th.

if i had a 1/4 mile, i could do 220 on pump gas with a lightened kicker cover.

Torch
09-06-2010, 12:03 PM
ok, Kelly and Brandon, I thought we were going to let this thread simmer down a bit.

KT
09-06-2010, 3:14 PM
awww it's all in fun ,

Mag shaft won't stay put in my bike still going to have to macgruber something later this week ...Kind of a bummer really put over $700 in something would like to not have to modify it all to hell to use it ...already had to work on the mount plate case it wouldn't lay flat in my timing cover ...Got to cut the bolt off alittle more maybe machine the shaft to fit the taper ...Could have damn near got a mag off a cement mixer and had just as much work in adopting it to the bike ...but that's another thread....

Torch
09-06-2010, 4:31 PM
Kelly: Yea I know it's all fun.
Some of the mounting plates need a little clearancing at about 11 oclock.
I sent you a PM with some fixes for that taper drive, call me after you do that.

justice66
09-08-2010, 10:24 PM
So I am not running at bonneville and ill probably never hit the drag strip so I am going to buy a jrc for my tr6. Seems good enough. I can afford to loose a little bit of power.

ClassicCycles
09-08-2010, 11:16 PM
And there ya have it! Decision made... Glad to see you listened to both sides first. :)

WolfHunter
09-23-2010, 1:33 PM
Not to get off topic but has anyone ever seen the tool that straightens an trues up Amal carb bodies? My local Triumph old timer has one. it has a solid cylinder that goes down where the slide goes and another block that mounts to the flange and twists the carb back into shape? he used it on my amal and the slide no longer stuck and the flange was flat. anyhow Tiger chris did fly by me when i was doing around 100mph so as far as 130 goes i dont know, but he was way up there.

CRFyou
09-23-2010, 1:49 PM
Not to get off topic but has anyone ever seen the tool that straightens an trues up Amal carb bodies? My local Triumph old timer has one. it has a solid cylinder that goes down where the slide goes and another block that mounts to the flange and twists the carb back into shape? he used it on my amal and the slide no longer stuck and the flange was flat. anyhow Tiger chris did fly by me when i was doing around 100mph so as far as 130 goes i dont know, but he was way up there.

that would be awesome. but it straightened the carb as opposed to honing it?

WolfHunter
09-23-2010, 1:54 PM
yeah the two pieces of the tool are actually connected to each other. they connect to the carb at two different spots (inside the slide opening and to the flange?) and are tightened together similar to a vice thus bringing the carb back into shape.

CRFyou
09-23-2010, 2:09 PM
yeah the two pieces of the tool are actually connected to each other. they connect to the carb at two different spots (inside the slide opening and to the flange) and are tightened together similar to a vice thus bringing the carb back into shape.

that sounds crazy. it doesn't require heat? it just smashes the carb back into shape?

lets find this tool.

WolfHunter
09-23-2010, 2:22 PM
that sounds crazy. it doesn't require heat? it just smashes the carb back into shape?

lets find this tool.
yeah i didnt believe it myself until i saw it done in front of me. i like my old amals and this tool saved me from buying a new one. i'll have to ask him where he got it but hes a little bit elusive.

CRFyou
09-23-2010, 2:51 PM
yeah i didnt believe it myself until i saw it done in front of me. i like my old amals and this tool saved me from buying a new one. i'll have to ask him where he got it but hes a little bit elusive.

here's some dudes talking about it with a picture. i think one of the guys said he made one himself. doesn't help us out though, i want one.

http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=220926

WolfHunter
09-23-2010, 9:00 PM
Yes thats it CRF!
http://tioc.org/coventrysparesltd.com/flangeweb.jpg

it helps if you have a handful of old slides that arent too knackered to swap until you find one that has the right fit. easiest way to bring an old Amal back to life. Im sure the knowit alls will have something negative to say about this tool.

cooter
09-24-2010, 5:40 PM
im all fa bush mechanixs. althuogh id heat in the oven sooner than do cold , , looks like a usefull tool

CRFyou
09-24-2010, 10:06 PM
Yes thats it CRF!
http://tioc.org/coventrysparesltd.com/flangeweb.jpg

it helps if you have a handful of old slides that arent too knackered to swap until you find one that has the right fit. easiest way to bring an old Amal back to life. Im sure the knowit alls will have something negative to say about this tool.

the only thing anyone needs to say is to tell us where to get one or two.

KT
09-24-2010, 10:13 PM
I could see trying this on a mono bloc that is a right or left which everyone it is they don't make anymore ...But I can't see the reason for the time and trouble when 930's are $150 new ..Seems to me I would rather buy new carbs and be done with it then go through this procedure and it still maybe not work or still need to buy new slides or whatever and rebuild the carb ...Just my 2

CRFyou
09-24-2010, 10:24 PM
I could see trying this on a mono bloc that is a right or left which everyone it is they don't make anymore ...But I can't see the reason for the time and trouble when 930's are $150 new ..Seems to me I would rather buy new carbs and be done with it then go through this procedure and it still maybe not work or still need to buy new slides or whatever and rebuild the carb ...Just my 2

i've got 3 old triumphs currently. i have bought and customized another 3. new carbs get expensive. especially since i'm not rocking too many tr-6 heads.

KT
09-24-2010, 11:33 PM
I have 4 currently and built 3 plus parted out about 5 more ...Most times carbs need a rebuild but I have seen one or two mucked up beyond help ...I just don't see it as a huge problem for me ...I have bought a total of two new carbs out of all those bikes ..If you grab junkers to build yea I could see it getting expensive but most times you get decent carbs or rebuildable ones anyways ... but everyones ride through life brings different things ...My haunting part is good wheels ..seems like I can hardly ever get a bike that has decent rings and spokes...

There is a part I wish I could fix easy on the cheap ....I just traded a tr6 head for a 69 bonnie head the other day everyone bitches about dual carbs and I don't see the gripe there either so maybe I just have not seen what others have yet...

cooter
09-25-2010, 3:04 PM
Ive owned trumpy for 30 odd yrs an had maybe 20 or more ,
built choped an repaird most of em .

sometimes you can salvage a part , like ive had 60 thou pistons cam ground down to 40 thou ta save money or had pistons expanded an cam ground down to fit
, but if i can buy a part new fa amost the same price as rebuilding it ( carbs wheels ect ) id buy em new,
the carb tool would be great to have if carb was sticking because warped and new carbs not available ,

so yea it would be a handy tool to have around, but for reiablebility id still get the new carb when i had the money

WolfHunter
09-26-2010, 6:12 PM
It took my Triumph guy about 2 minutes to get my carb back from the dead with that tool. And he used it on many of his own carbs & customers too. That sounds like alot of money saved to me. Sometimes buying new is the way to go but saving an original part if you can -is noble in its own right.

He still hasnt got back to me yet weather he bought the tool or made it.

cooter
09-26-2010, 9:15 PM
It took my Triumph guy about 2 minutes to get my carb back from the dead with that tool. And he used it on many of his own carbs & customers too. That sounds like alot of money saved to me. Go spend your money. I have mine to spend on other things now.

He still hasnt got back to me yet weather he bought the tool or made it.

Hey when does the Sheepfucker and those other "post-aholic know it alls who dont ride" chime in about how this tool sux? lets fight

i think your the 1 doesnt ride , the worlds full of loud mouth wannabes, and your just one of them , the day they invented the internet you all crawwled out of the woodwork ,
the real shame of it is you spoil sites like this , i wipe my arse of you and flush you dowm the toilet where you belong . from now on wolf jerker will be ignored by me ,
i would sugest that anybody else who is on here for honest dialog about motorcycles does the same . Stupid childish insults are for children & are not the way of grown men

WolfHunter
09-27-2010, 8:02 AM
relax, im playin with those guys. they started that tone so its fair game anyway. i wish they would chime in how stupid this tool is because I know they've never seen one.

WolfHunter
09-27-2010, 8:07 AM
i think your the 1 doesnt ride , the worlds full of loud mouth wannabes, and your just one of them , the day they invented the internet you all crawwled out of the woodwork ,
the real shame of it is you spoil sites like this , i wipe my arse of you and flush you dowm the toilet where you belong . from now on wolf jerker will be ignored by me ,
i would sugest that anybody else who is on here for honest dialog about motorcycles does the same . Stupid childish insults are for children & are not the way of grown men
I like that name WolfJerker, thanx . keep working on your spelling bro. you'll get it;

KT
09-27-2010, 12:06 PM
I don't think it is stupid or useless ...Anything that takes junk to funk is never bad ... In my personal experiance I have not seen a big call for it .... If I ran a shop or had a problem with never getting decent carbs I would want one too ...Just never been in a pinch for it , Now if we were talking the '05 Triumph I have that I need carbs for and they are $700 a set or more yea I would be looking for that tool pronto ...

Nono
09-29-2010, 9:46 AM
<a href="http://s215.photobucket.com/albums/cc136/BSAchoppa/?action=view&current=LetsFight.jpg" target="_blank"><img src="http://i215.photobucket.com/albums/cc136/BSAchoppa/LetsFight.jpg" border="0" alt="Photobucket"></a>

WolfHunter
10-01-2010, 8:27 AM
haha thats great. How long did it take u to make that graphic?

fatass
10-01-2010, 2:24 PM
That's an old Marine propaganda poster from WW1.

The newspaper said something about the Huns killing a bunch of people, so the guy says, "Tell that to the Marines". Right now's the time to pop him in the face, while he's finger fucking his jacketry.


haha thats great. How long did it take u to make that graphic?

recycler
10-09-2010, 4:51 AM
I just put a 26 mm JRC from Lowbrow on my T100. Works nicely. All I had to do was move the needle one notch and its running great. It will sit and idle forever without dieing. I would recommend to anyone IF you are not concerned with period correctness or originality. It just depends on the bike and the owner. I had to buy a carb anyway so I wanted to try one.

My ONLY complaint is the slide valve spring is a little weak when you are used to an amal.



Brad

cl175dave
01-24-2011, 12:30 AM
I read the bickering going back and forth. Amal vs. Mikuni. The JRC carb is not sold as a racing or High Performance carb. I work for JRC and we've sold several. I'm using a JRC 26 on my '67 T100C .My son has a 26mm JRC on his 67 Cub and his 70 T100C. They do the job. I know that they've been used on Royal Enfields, Urals, BSA's (B50's, A65's, Triples etc.), Triumphs, etc. A friend is running 4 on his CB750 4(Honda- wrong forum/area) and I'm running a pair of 26's on a 71 CL175 cafe racer( again Honda- wrong forum/area). People that I know use them, really like 'em. :D
One problem I heard was were a guy thought that the tickler was broken. After we told him to pull up on the choke, he was reassured and had no other problems.

WolfHunter
01-26-2011, 6:05 PM
Anyone know the correct millimeter JRC and its jetting for a single carb 73 Tiger 750?

66triumph
01-26-2011, 7:20 PM
If you are on a budget and can't afford Amals then buy the JRC carbs, if those carbs are defective then JRC will send you another set. think about it, if you paid $100 retail, and everyone connected with them makes the normal markup then somewhere in China they cost about $3.00 to make..... I'm sure you will be fine.
Do some subject searching on PWK or JRC carbs on this and other motorcycle journals and then make your decision.
they are an very affordable alternative carburetor, and like many new products they will need to pass the test of time. Amals only last about 40 years then you will need to replace them.
Note* there is no choke on PWK's, they have "enrichment circuit" for starting, the difference is Amals have a tickler for starting and a choke for cold engine operation.
and PWK's still only cost $100 even after someone hand glues the mounting flange on it.

My 2 biggest complaints about them were the jankey ass glued flange, and the weak ass slide return springs. After you put them on and get it running, spray some carb cleaner around the mounting flange and listen to the RPM's come up. leaking P.O.S. I personally run mikunis on every bike I have.

-A.

Torch
01-26-2011, 10:02 PM
My 2 biggest complaints about them were the jankey ass glued flange, and the weak ass slide return springs. After you put them on and get it running, spray some carb cleaner around the mounting flange and listen to the RPM's come up. leaking P.O.S. I personally run mikunis on every bike I have.

-A.

The JRC carbs work ok, but the major draw back to them we have found is they do not refill with gas fast enough to keep a larger 650 or 750 C/C bikes running at full throttle for sustained speeds,
several of our customers would say they started easy and idled well but complained about the bike shutting off after running through 3 gears at full throttle. after some test runs what we found is they were running out of gas. that mixture lean out situation during hard acceleration can cause the engine to overheat and damage pistons.
We ended up putting a set of brand new Amals 930's and 932's on those bikes and all was fine.
Maybe a smaller bike they would be fine,
They are an affordable carb, but what if found in life is generally the disappointment factor goes up as the price goes down.

CMA406
01-26-2011, 10:19 PM
The JRC carbs work ok, but the major draw back to them we have found is they do not refill with gas fast enough to keep a larger 650 or 750 C/C bikes running at full throttle for sustained speeds,
several of our customers would say they started easy and idled well but complained about the bike shutting off after running through 3 gears at full throttle. after some test runs what we found is they were running out of gas. that mixture lean out situation during hard acceleration can cause the engine to overheat and damage pistons.
We ended up putting a set of brand new Amals 930's and 932's on those bikes and all was fine.
Maybe a smaller bike they would be fine,
They are an affordable carb, but what if found in life is generally the disappointment factor goes up as the price goes down.

i read this same info on 3 different boards, seems like case and point to me. i got an amal, ill kick the bike a few more times in order to have proper performance when riding...

bellegi
02-12-2011, 11:01 PM
I bought a jrc carb to replace my old amal on my 71 tr6. The bike starts and idles much better but the slide starts sticking open after the bike warms up. Once it cools off the slide works fine. Overall I'm disappointed with the carb. The slide return spring is weak.

UNKLian
02-13-2011, 7:10 PM
the disappointment factor goes up as the price goes down.

Right on.
:clap for you:
:killerjob: