piston rattle

1 reply to this topic
  • dodge03

Posted November 02, 2004 - 10:47 PM


here is one 4 ya. i have started to notice a rattle at low rpm's like coming out of a corner just when i turn the throttle slow and steady. it does not make the noise if i rap down hard on it when racing just when i'm goin slow. this is a new sound to me on this bike is it normal engine wear like piston slap or can it be because of the high compression at low revs. by the way i am riding a 03 450

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted November 02, 2004 - 11:01 PM


It is probably chain slap, although you should get some of that at heavy throttle at low rpm's, too. I'ts 3 times as long between power strokes (a turn and a half instead of a half) on a four stroke compared to a two stroke, so the power flow is pretty choppy at low speeds. Makes the chain slap the slider pretty hard.

The gearbox can be a bit noisey going slow for the same reason.

Related Content


Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

Megabomb Fitment by 288yz450

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.