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Japanese Bikes, Build Threads & How-To’s Build threads, tech Q&A and conversations centered around custom-built motorcycles from the Land of the Rising Sun

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Old 10-20-2011   #1
 
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GSX 400E -83 chopper buildthread

Finaly, after some troubles and hazzles I become a member of this interesting forum and I can start my buildthread here about my, for now, for me, quite ugly GSX 400 I don't want to offend anybody that likes the appearance of it, I simply just don't.

My journey with this bike began when I was out with a couple of friends photographing them riding their bikes and suddenly I realized that I myself could take this on in my garage. Seeing my friends riding these bikes made it quite easy to fall into the trap.



Actually when I started out looking for a bike I first had to research wikipedia to find out what kind of bike I needed to start choping, the (again for me) ugly bikes that I saw was surprising, but in a good way since they are fairly easy to come by.

After a while of trying to get my hands on an XS650 I gave up and bought a GSX400 instead since the price difference was 3800$ against the cheaper 650$ that I coughed up to get my bike.

When I got it home it looked like this.



As I'll get rid of alot of things, including the airbox and changing the exhaust I started preparing to rejet the carburators, so I tore these down to the bare bones.



Sadly us swedes don't have access to much chemicals so I'll see later on how I'll go about cleaning them up, but something needs to be done here to get them spotless, maybe I'll even buy an ultrasound cleaner just to get it done properly...

As I'll cut down the subframe and hardtail it I figured I needed to build a jig to keep the geometry of the axles. So I bought the material for that and started fetching the old welding skills I never got in school 9 years ago.



After welding the front and rear axle on to the jigg I mounted the bike and it was sitting solid as a rock, even better than I dared to hope!



I welded on some towers for the engine mounts aswell and then cut down the frame. Now the sub frame and the swing is out of there and I can start imagining the final outcome of the new frame for real.



To keep the right angle of the rear plates holding the rear axle I actually welded them onto the jigg. Later I'll weld the new frame on to the cleaned plates and can cut them of the jigg again.



I started cleaning the rear plates and will later have to fill the lower space with a thick plate that I can weld on there and form like I need it.



So now I'm waiting to get help from a guy in my town that will bend the new tubes that will go on my rear frame and until then I will clean up the metal further and prepare for the rest of the frame. Hopefully I'll get the new frame built so that I can mount the tires and roll the bike down in the cellar before the snow comes, I want to get my car into the garage during the winter. Don't worry though, as the snow falls I'll have plenty to do with all the engine parts, so I know exactly what to do with all the enormous free time that I have xD
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Old 10-20-2011   #2
 
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cant waiiiiittttt to see more of this!!!!!!
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Old 10-20-2011   #3
 
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make sure and post this over on GS Resources... They will really get a kick out of it...


lol
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Old 10-20-2011   #4
 
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Allready did, can't say that they are super pleased
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Old 05-01-2012   #5
 
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Well the build has been standing still for quite some time now... Other obligations got in the way. I have gotten the tubes bent for the hard tail. So today I started the work on filling up the plates holding the rear axle so that I will have surfaces purpendicular to the tubes leading from the front of the bike.



The plate will fit in the back plate like so:



After I cut ditches in the back plate and the new plate I cut it off the material I started out with. I took a bit to much out of the piece while doing the ditches though, something to improve on the next one.



From lack of experience I didn't notice right away that the gas started to empty out of the tank in the weld machine so I happened to get some air holes in the weld. Have to grind that out and fill with new weld when I can refill my gas tank. Can't do it today though because of the holidays



Will continue when I have more gas. C ya!
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Old 05-05-2012   #6
 
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Pinesol, palm sander, ratchet strap. BAM instant redneck ultrasonic cleaner
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Old 06-02-2012   #7
 
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So, some welding have been done on the frame this weekend and should continue tomorrow.

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Old 06-03-2012   #8
 
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Frame has a great stance! Those wheels are pretty bitchin too.
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Old 06-03-2012   #9
 
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Quote:
Originally Posted by crush1776 View Post
Frame has a great stance! Those wheels are pretty bitchin too.
Thanks! The wheels are actually original with wider tires from what I can deduct. The tires are 90/110 -18 which would be equal to 3,5/4,25 inch. From what I know the tires on this should be 3,50 inch wide, but I can be wrong maybe.

I am actually looking to get the biggest tires I can get on those wheels, don't really know if there are any bigger to get without going with bigger wheels though...
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Old 06-13-2012   #10
 
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Really love Your bild so far!

Realt love what you done so far!
Have the same plans and same bike but do not have the weldingskills..
Saw your jigg, really smart
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Old 06-13-2012   #11
 
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Quote:
Originally Posted by Mcgyver View Post
Realt love what you done so far!
Have the same plans and same bike but do not have the weldingskills..
Saw your jigg, really smart
Hehe I can't say that I have the welding skills either, at least not yet... :P

So anyways the build goes on! I finished the welding of the frame and took a quick look at how the engine is sitting in the frame, it looks allright to me!



This monday I have an appointment with a guy in the society which handles all the homemade bikes in Sweden to get his word on the status of my welds. I figure he wont like all of the welds and I really only hope that atleast 2 or more of them are ok so that I atleast know that I can get it right some of the time.

While waiting for the days to pass I have been spending my time in Inventor (3D Cad) and am in the process of building a jack that is supposed to lift the bike 800mm the same way a normal jack goes 200mm. It isn't exactly easy since the high lewer ratio puts a big force on the actuated point of my normal jack (I'm currently stressing 40x30x3mm square tubing with 5,5 Tons :P ). But today I got a better idea and will continue to build that in inventor. The budget is on somewhat 140$ which is a hell of a lot better than the retail price for the same function of a meager 700$. I think some planing and hours by the computer are well worth it in this case xD



Here you see the Safety Factor which is WAY below what it should be
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Old 06-13-2012   #12
 
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Snacka om att tänka utanför lådan - GSX400E.. I really like it! Just had a friend put his XS650 hardtailed through SFRO. He's nick is "Hajpojken" here on the board if you want to contact him for any pointers or ideas.. On the other hand, it slooks like you've already got that covered.

Keep it up and keep those pictures coming!
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Old 06-13-2012   #13
 
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Quote:
Originally Posted by Stabler View Post
Snacka om att tänka utanför lådan - GSX400E.. I really like it! Just had a friend put his XS650 hardtailed through SFRO. He's nick is "Hajpojken" here on the board if you want to contact him for any pointers or ideas.. On the other hand, it slooks like you've already got that covered.

Keep it up and keep those pictures coming!
Nice to see a countryman! Yeah I was looking for an XS650 when I started looking for a project, the only one I could find was an -81 running at 3600$ (the damn thing had been standing still in a barn for 7 years as well) and with this one running at 600$ the choice was quite easy :P

Thx for the tip on "Hajpojken", I'll send him a hello later and check out his build.

Actually I have recently realized that my build can be quite jeopardized by my choice of material in the frame pipes... I heard on the swedish forum "sporthoj" that you are only allowed to add up to 20% more material thickness on the new pipes when welding them on the old frame, sadly for me I didn't see this when I read SFRO's manual, instead I read very carefully about their recommendations on material and went with a 3mm thick seamless tube. The frame is originally at 2mm or something like that which breaks those 20% right out the start!

Hopefully this will be ok due to the small size of bike, if it's not I'll probably order a complete set of new pipes and do a completely new frame from scratch since the thicker material is nicer to weld in then that pesky original metal...

Sometimes you have to learn the expensive way!
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Old 06-13-2012   #14
 
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I'm really diggin the "zip-tie" motor mounts...Makes me realize I have a whole bag of motor mounts in the shop...
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Old 06-13-2012   #15
 
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Quote:
Originally Posted by JayDanielz View Post
I'm really diggin the "zip-tie" motor mounts...Makes me realize I have a whole bag of motor mounts in the shop...
Haha no that was just to keep the wiring up of the floor :P I am missing one mount though but the other three are intact
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Old 06-14-2012   #16
 
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Found the thread, great job man! What kind of tank you planning on?

hope you don't have to go do it over. Give sfro a call or send an email! They are quite friendly and will help you in any way they can. fingers crossed.
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Old 06-14-2012   #17
 
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nice work so far. keep it up
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Old 06-15-2012   #18
 
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Quote:
Originally Posted by hajpojken View Post
Found the thread, great job man! What kind of tank you planning on?

hope you don't have to go do it over. Give sfro a call or send an email! They are quite friendly and will help you in any way they can. fingers crossed.
I actually don't have any certain tank planned out just yet, I am hoping the right style will come to mind when I finish the frame, put the motor in and have the sadle on there. The bike should tell me something like *divine singing* "aaaaaaaah peeeeanuuuut" *divine singing* or something similar

Yeah I emailed a Luiggi at SFRO to ask him what he thinks about that problem and he said we will look into it on monday next week when I'll go to him with the frame for consulting. They seem to be a nice bunch of people yes, this I have heard/read in other places as well so I have had a few mails going back and forth with this guy.

If I don't get it approved I will probably start over again with a proper adjustable jigg and a bare steeringpost and do the whole frame myself so I can go 3mm all the way around. Much easier to weld in that than in the thin original frame anyway! Plus I can use the jigg for every other project I might take on in the future which is great!

Quote:
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nice work so far. keep it up
Thanks Townson! I hope this will keep on going in a normal nice rate!
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Old 06-15-2012   #19
 
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Today have been another day in the progress but solely in the computer and by buying some things rather than actually doing anything with my hands...

I have a small mockup of a plan going on in my head about what to do next with the project and I actually will have to put a small pause in the actual building of the bike... I will need a good jack to get the frame up in the air and have it easy to handle, so for that I'm building an oversize jack, picking things from the car jack I have now and will with that solution hopefully have a fully functional "lift table" to use.

In order to build this though I am tired of having all the stuff I'm grinding on the floor, keeping it fixed with one of my feet, resting on my kne and cutting while not actually seeing anything but hoping I will smell burnt rubber before I cut my own toes off, SO I'll build a table and put a vice on it for future things I want to grind/cut.

So to make that quite short story even shorter, I will first build me a table, mount a vice on it, build an oversized car jack and then continue with the build IF it gets approved so far by SFRO. If it wont be approved I will probably also build a new jigg and start over on the frame. Sounds simple right?! Right!

I did take some photos yesterday on the welds btw and thought I could share some of them here today. Depending on the answer from the SFRO dude on monday these pictures will work as a "this is enough" or "don't do this ugly shit" reference to any of you who still havn't build your own frame.







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Old 06-15-2012   #20
 
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So I just finished up sketching a new work table for the garage made out of square tubing 40x40x2mm with a wooden board 2000x800x36 and a metal sheet on top of that 3mm thick. That sheet was more expensive than I thought though and the table would finish at somewhat 160$ Maybe that is cheap already but I will see if I can cut some corners in any way... I need that table though...

Skickat från min GT-I9100 via Tapatalk 2
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