Anybody have this problem?

[ATC350X 85]

When I am under moderate to heavy accelleration on my 04 trx 450r the rear end has a tendancey to go side to side slighty. This occurs on straightaways. Any kind of terrain. I run 3-4 psi in the tires.

[tltcracing]

its a byproduct of the sucky rear shock. get it revalved and add in a new link to go with it. oh and if you still run stock tires, that could be the culprit. and if you bent a rim or an axle that could cause sidewase acceleration.

[DirtDevilBT]

:huh

it's what happens when you have more power than what the tires can handle. Normally a good thing.:huh

or are you talking about a wobble?

Does it do this on cement?

[MAD450r]

You need to mess with compression some to make it ride softer and stay planted better. Once you get it to stay planted better it'll excellerate in a nice strait line. If you can afford as other said a revalve and respring along with new link will fix it totally.

check your axle bearings and swingarm bushings

[Flynbryan19]

It sounds like your suspension is packing. If it happens while accelerating in a straight line of a set of bumps/whoops. Adjusting your compression can help, but you most likely need to speed up your rebound.

[MAD450r]

Rebound is already too fast stock on the rear. If anything slow it so it doesn't wont to be bouncing up before its even done compresssing.

[ATC350X 85]

Ive got the rebound as slow as it will go, I have to check the compression to see where its at. Its been awhile since I messed with that, but id guess its all the way soft. I am running Razrs on 350x rims, i swapped them on from my 350x when i put a hole in the sidewall of the stock tires. I wish i had the money for all the suspension stuff. Nothing is bent. It almost feels like the tires are flexing on the rims side to side. I dont think the razrs have a very stiff sidewall plus there 3-4 years old.