03 yz450f, noisy???

6 replies to this topic
  • srfer71

Posted May 17, 2007 - 12:36 PM


I just finished rebuilding my motor. Before i rebuilt it, the motor was noisy. It goes away when you're riding, but still makes me nervous. Also, after i rebuilt the motor it still is noisy. The valves are all within specs and it runs good.

Also, the chain. When i have the bike propped off the ground and running in first gear the chain moves around/ skips a bit. I heard this was normal because there is no pressure/weight on the rear wheels which means there is no pressure against the tranny. Well when im riding, if im just coasting down the street in 2-4 it doesnt do it, but when i go into 1st(remember im coasting) it doesn't seem to skip until i go really slow.
Im guessing this is all normal since there is absolutely nothing wrong with the motor.

I guess im just to paranoid

  • 642MX

Posted May 17, 2007 - 01:25 PM


Your tranny should not skip in any gear.

  • srfer71

Posted May 17, 2007 - 01:41 PM


It doesnt necassarilly skip, it jst seems to skip. When im riding it fine, but mostly when the bike is up off the ground it seems to skip. I was told its normal because there is no pressure on anything.

Also is the yz450 a generaly noisy bike?

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  • srfer71

Posted May 17, 2007 - 02:10 PM


Also i read somewhere that the clutches are noisy, is this true?

  • John407

Posted May 17, 2007 - 02:13 PM


Yes and yes. The motor is a little noisy and the "skipping" you mention is because it's a single cylinder 4 stroke and there is only one power stroke. Greyracer explained it much better in another thread. Sounds normal to me.

  • srfer71

Posted May 17, 2007 - 03:17 PM


Ok great. thanks
I just finished rebuilding/putting in some new gears i nthe motor and I'm just very paranoid.
Tomorrow i will be driving out to the desert to break it in. I didn't want to drive it out there and have something go wrong.

I can't test it around my house because i have my paddle on, lol.

I will give a ride report after i get back.

  • srfer71

Posted May 19, 2007 - 05:48 PM


Ride report.

Bike ran awesome, motor ran good, coolant wouldn't stop leaking from the hole under the water pump/impeller cover, and i broke the kick start shaft when it kick backed really hard. Thats why a wear boots

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