View Full Version : CMX450 makeover... "The Jankster"

04-05-2010, 1:27 AM
I debated starting a "build progress" thread.. thinking I would bore everyone including myself..
but a few of you dudes have shown interest in what Im up to in some of the threads Ive chimed in on so this is probably the best way to help out and get some help myself..

I'll make another post with the whole story when its done, but to sum it up Ive been rolling like this for a couple years...

Finally got some motivation and finances to change it up a couple months ago.. ordered a bunch of shit including a TC Bros hardtail kit I will be tackling soon.
I started by ditching the 12" apes .. and welded up some Z bars using the tubing from the first set of bars this bike had.. Determining the pull back was tough.. my friend Steve decided on a unit of measurement called a "baby turn" when cutting my 45s. When one side was welded up, I measured it and duplicated it on the other side. I have no idea what happened, but these bars turned out awesome and riding position is much improved to boot. I conducted a couple precision strength tests in the front yard including a tug of war to make sure everything was solid. I mounted and wired up a new headlight on the existing bracket and shaved the fender mounts and reflector recesses off the fork legs after I got a few responses on the best way to go at it. Also cut off the mirror mount from my brake fluid res and cleaned a couple things off the trees. The levers and mirror were ebay scores... Im used to riding pit bikes, so I got some little "unbreakable" fold away style levers for 2 finger operation. The brake line is waaaay too long now, will probably have a stainless one made to length. Put a Beston throttle housing from Lowbrow on.. this thing gave me fits. I had to remove the stock cable elbow because of course it wouldnt fit the new housing. Once I finally got the cable to length, soldered on a new barrel nice and solid, I found out the fucking barrel thats meant for the throttle wont fit through the motherfucker, so I got out the hacksaw and cut a passage for the cable to go through the housing. Luckily the grip covers up the hack.
I decided to keep the super narrow seat pan.. put in some high density foam, and covered it with an old bandana. Much better! No more sliding around under the harsh acceleration the 450 is known for! I'll probably keep the seat springs..
The tank is from kustomwerks and is the fruit of Taiwanese child labor. They had the new kid put my tank together...and after I mocked the mounts up to my bike, I determined the tank itself is not straight. Not terrible, but this tank has no business on a bike done right. Luckily its just going on my bike. I relocated the petcock to the back, and welded in the bungs for the sight gauge. 2 days and 4 tries later, I had a tank that wasnt leaking and ready for liner and primer. I only had brown primer.. so now I have a sweet rust brown gas tank with a red seat and a metallic silver fender. My green metalflake helmet really sets it off... nice, huh?

I took the left side cover off and did a quick polish job.. made me realize how much more work is ahead of me once the bike is ready to be taken apart for final finishing.

Heres my strutted swing arm hot garbage looking tail section I cant wait to cut off. Gonna be lots of open space when that crap is gone. Keeping the trailer fender, will probably use the stock drive chain for a fender strut/ sissy bar. If anybody has any helpful advice on that let me know!

04-05-2010, 4:12 PM
looks good man. will it do 100? i popped a rec./reg. trying to do it on my 450.

04-05-2010, 6:07 PM
looks good man. will it do 100? i popped a rec./reg. trying to do it on my 450.

I know itll do over 90, Ive been paced at 85 on the freeway and itll go faster than that.
Downhill with a gust of wind and a healthy fart and it might happen! haha...
I looked into re-gearing it a little while ago but decided to leave it.
JT sprockets makes a 36 tooth rear.. stock is 37.

04-12-2010, 9:10 PM
so I got my clear HKG pegs and toe shifter on... these things fit this bike like 2 week old warm mayonaisse on an ice cream sunday. At least the holes for the clevis pins were close.
But now that theyre on there it was worth it!
I also rolled over to Crown Performance in Vista and had them make me a smoked color stainless steel brake line. Thats one thing done right on my bike... looks and fits great.

04-13-2010, 6:45 PM
haha,, yeah man that things come a long ways,, you rollin it out to hippy killer this weekend?

04-20-2010, 11:19 PM
past the point of no return....as much as i wanted to avoid it, I had to cut off the tubing in front of the crossmember.. it started curving before reaching that point. At this point I realized nothing is straight on this frame... backbone curves right, crossmember is totally off, etc etc etc.

making some progress... had to put the motor back in when welding the stock crossmember since its so crooked. You can see what Im talking about with the backbone too if you look close.

despite the setbacks its turning out well..

04-27-2010, 10:51 PM
progress... came out with about 4" of stretch.. I think itll be a perfect compromise of keepin it short but at the same time giving my long ass legs some room to stretch. If you cant tell from the pics, this bike is tiny.. thats a 15" rear wheel. Seat height will be even lower than it was before. Ive got the chain line centered and will make some wheel spacers tomorrow...

Check out my sweet upper brace..

05-04-2010, 11:17 PM
So its back together for the most part and running again..
It turned out looking a little long.. I think the small wheels and small seat and all the open space make it look longer than it really is. What matters is I fit on this thing a whole lot better now..
Im working on the exhaust right now.. pipes will run the length of the bike on the right side, should fill up some of that open space along with a chain tensioner...
I wasnt going to run a tensioner, but I ended up using 129 links of chain on this thing and the more I look at it, the more I figured I might as well just put one on...



Sissy bar was tedious.. but turned out awesome...

Spacers turned out awesome too... cost me $1.20 in washers for both sides.. used scrap tubing.

I dont know what to do here... but my brake light switch needs to look something like this. I shortened the spring, but, I cant figure out the best way to make a bracket for it or cut up the stock one to make it decent looking.. Suggestions?

05-05-2010, 2:24 PM
That sissy bar is sweet! No kidding about the time it took to make that (lot of spot welding).

05-06-2010, 12:43 AM
That sissy bar is sweet! No kidding about the time it took to make that (lot of spot welding).

Thanks Jason.. I welded the inside links from both sides...its pretty solid..

heres what I came up with for the brake light switch tonight.. decided to ditch the whole factory setup because it just wasnt happening..
Thats a valet switch (momentary) for an alarm I had floating around in my tool box.. made a quick bracket. time will tell if itll stand up to water and abuse..

05-06-2010, 5:23 AM
The first thing I thought of when you asked for suggestions on the switch was a Normally Open momentary switch the other way. So the switch is always pressed until you touch the brakes. The reason I was thinking that, instead of what you have there now, is that any movement of the brake would activate the light. As your is now, you'd have to go full on with the brakes to activate the light.

When I have someone behind me coming to a stop, I'll give it enough brake to light up a good ways before the stop. Even though its not enough braking power to really get me stopped, it back them off enough.

A hood switch for a car alarm would work well for this. I believe they come as NO.

Just a thought.

05-06-2010, 2:31 PM
Good thinking on the valet switch. Bracket could be trimmed down, look real slick. What about a rubber boot or cap going over the switch?

05-20-2010, 12:25 AM
Im gonna knock the corners off that brake light bracket and run it as is.. seems to be working fine.

I finished up the exhaust a couple days ago.. Sounds healthier now.. I think the added backpressure did it some good. Heres how she looks until I put some miles on her and take everything apart for paint and polish.


05-22-2010, 12:37 AM
So how did you relocate the choke? The cable is really annoying on the handlebars. I want to keep the choke because I actually use it but I would like it to be located somewhere around the engine. How did you handle this?

05-22-2010, 12:47 AM
that is a way COOLbike and i have to show this to my son in law for real inspiration !

05-22-2010, 2:19 PM
i was thinking of doing a sissy bar or something like that for a rear fender mount on my bike, guess i will have to change it up a little i guess

05-22-2010, 2:23 PM
choke cable was shortened, die was drilled and epoxied onto cable by previous owner.
This routing was temporary.. usually it exits out the other side by the fuel petcock.
Ive thought about getting clutch lever and perch for 1" bars, soldering on a new barrel, and mounting it to the frame under the seat or something. Thats another option. But the die setup has been working fine for a long time now.


Wildcard... stay tuned, it should be looking a lot prettier here soon. All the white paint marks are for shit Ill be cutting off or cutting down before the frame gets coated.

05-24-2010, 5:05 PM
good work man,, that thing is turning out pretty rad

07-06-2010, 9:55 PM
here she is.. gonna call it done. The forks need to be sanded down and polished again, and Id like to rig up another convex corner mirror like I had in previous pictures, the one I had vibrated itself off. I also had the battery leak acid all over the exhaust coating and it ate right through it, but besides that Im still alive and nothing else has fallen apart or broken. Sweet!
Its been overcast so the frame doesnt really stand out in the pics, but its a metallic "laser bronze" done by Electro Tech in San Marcos. They also did the titanium exhaust coating that Im not too happy with, if I knew it would last for 2 hrs I would have just rattle canned it and saved myself $130.. Everything else was done in my garage.


07-06-2010, 11:32 PM
Looks fucking badass man, really cool shit.

07-08-2010, 11:11 PM
Looks fuckin sick,im thinkin of starting a yammy chop,good work man!!

07-09-2010, 7:23 AM
Where did you get your chain tensioner, and are you happy with it? I'm in the market for one, and I really like the look of the ones with skate wheels.

07-09-2010, 9:08 AM
Where did you get your chain tensioner, and are you happy with it? I'm in the market for one, and I really like the look of the ones with skate wheels.


Lowbrow and a couple other places carry this guys products.. I got the weld on one and
its a quality piece, no suprises or issues so far. The 64mm skate wheel setup with abec 15 bearing is quiet too which is nice.
and, like I said, the use of a chain tensioner was more of a necessity for this build than a choice..

11-21-2011, 9:22 PM
This is badass!

I wonder if those wheels would work on a CB400?

10-18-2013, 10:49 AM
Hey man, where did you get those struts at? im looking for a pair for my 450, thanks..