TRX500r PLEASE FIX MY VIBRATION!!!!!

[iaknown]

Hello all, I am new to this forum so please, be gentle...hehe. Over the past year I have been building a noyce TRX500r for MX, it is at its final stages, but I am having a problem with vibration (I know go figure) and need help from you guys who have already crossed this bridge (possibly you DIER-Wolf???? and whoever else). My quad is done right, A Laegar 250r based frame built by Mike Laegar himself for the CR500 motor, totally rubber mounted and everything (only 5 of these frames were ever built by him), rubber isolated steering shaft, 98 CR500 crate engine, Paul Turner pipe, hand-built for this quad specifically, JRD No-link swingarm with Elka shock, once again built for this quad specifically, etc, etc, etc. Even with ALL of the precautions taken from the getgo with this quad, the vibration is much better, but STILL not good enough to ride for extended periods of time. So this is where you guys come in (I hope) I know at this point, I am sure that there is nothing else I can do external of the motor, my question to those of you who know, what needs to be done internally???? I imagine the replies will be centered around balancing but how specifically??? How much will it improve??? I am at my last straw, if you guys can't help I give up, I just re-fabricated the steering stem 5 different ways to try and cure the handlebar vibration and might as well just pissed in the wind. PLEASE HELP!!! Thanks in advance......

[terboed]

i think vibration and cr500's come hand in hand. i have not seen dier-wolf on here in a loooong time. try emailing him.

[iaknown]

thanks, i'll try emailing him. I know the CR500 engine is notorious for vibration, but I also know that some guys have improved the vibration through balancing and/or moved the vibration around in the RPM range....I just need to know how to go about it and whether it'll be worth it....

[flotek]

private message member "500sabertooth "

[crazyracer]

would lightening the flywheel in certain areas help? I'm not sure if it would be the same as a counter balancer, but the removal of weight on one side of the flywheel might throw off the balance enough to help reduce the vibrations. Just a thought, I don't know anything acutally about this...just shooting ideas.

[flotek]

i would be inclined to think lightening one side of the crank(flywheel side) alot in comparison to the other side would actually make the problem worse by throwing the weight bias out of propertion, but its hard to say . counterbalancers are actually a weight ,one nice thing is cr500 hold together alot better than other big bore bikes like kx and yz,cr500's have a good solid design /crank bearings

[C-Leigh Racing]

This wont help with your problem right now, but a project is in the works making some billet cases for the CR500 engine & including a counterbalancer in the fix.

Right now we are trying to find some junk cases, cranks & things to get some measurements from, but sofar havent found any yet, I didnt know CR500 stuff would be this hard to find.
If you or anyone knows anybody that has any parts, please keep me in mind.
Billet 250R replacement cases are in the process right now, will have more details latter.
Neil

[iaknown]

hmmmm, that sounds like the ticket but unfortunately, i'm on a timeframe. If this problem isn't solved for this riding season, it's getting sold. This combo might be worth more to someone else, I just wanna go MX riding and have something with tons of power and I came across a deal on a lot of the parts to build this. I might have to go a different route though. In the meantime, if anyone out there is interested in this quad, email me, i'm tempted to just say the hell with it all. Unfortunately I have a lot of money invested and will not just blow it out though.....anyway, I would think lightening the crank on just one side would put stress on the crank itself and the rod because of centrifugal force. Any other ideas or fixes out there????? Anyone with a CR500 in a quad that can clue me in????

[2002shee]

eviltwin is right, a lightened flywheel will make it worse. You will need to rip it all down and start with balancing the crank. rod and piston. First seperatly then all together. It will be better but that is one hell of a vibrating motor to begin with. For the heck of it try some vibration dampers in the handlebars.

[iaknown]

Yeah, already tried that too. I have those brass dead weight contraptions that go in the ends of the bars. Also, like I mentioned, the steering stem is totally rubber isolated at the top and bottom and I remade it out of solid shaft, which seemed to dampen the best compared to tubing. The vibration is A LOT better then before all of this, and I realize it is always going to have some vibration, but its still not quite as good as I would like it to be.