Should I replace my piston?


6 replies to this topic
  • Fry

Posted December 08, 2010 - 09:40 AM

#1

I have an 09 450 with 50 hours of vet. int. racing.
My valve clearances are within spec.
Do I need to remove the cylinder and check or replace the piston?

  • Jim813

Posted December 08, 2010 - 09:54 AM

#2

I replaced the piston/rings in my 2008 at 128 hours of B class riding/racing. The piston still looked fine and I would have felt confortable running it another 75-100 hours before checking it again. Yamaha's are notorious for there durability, and I've seem/heard of stock engines running perfectly with well over 200 hours.

  • crf450319

Posted December 08, 2010 - 10:05 AM

#3

I'd say no, not at 50 hours. I'll put 100 hours on mine before I replace it, I run MX only and race B or intermediate. I did however, replace my cam chain at 60 hours as I've read about a number of failures assoc. with them. I had 6 or 7 links on my cam chain that were binding (only noticed after removal). For less than $20 I'll replace it in another 40 to 60 hours which will more than likely be when I replace the piston.

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  • Gunner354

Posted December 08, 2010 - 10:24 AM

#4

353 hrs on an 09 450 without opening the engine for even a valve check. These Yamaha's are amazing. High quality true synthetic oil and maxima fft air filter oil really pays off.

  • Gunner354

Posted December 08, 2010 - 10:26 AM

#5

I'd say no, not at 50 hours. I'll put 100 hours on mine before I replace it, I run MX only and race B or intermediate. I did however, replace my cam chain at 60 hours as I've read about a number of failures assoc. with them. I had 6 or 7 links on my cam chain that were binding (only noticed after removal). For less than $20 I'll replace it in another 40 to 60 hours which will more than likely be when I replace the piston.


What oil are you using?

  • dgcars

Posted December 08, 2010 - 11:09 AM

#6

So long as the oil has been changed + air filter kept clean you're good to go...and go.....and go

  • mikedabike

Posted December 08, 2010 - 12:47 PM

#7

353 hrs on an 09 450 without opening the engine for even a valve check. These Yamaha's are amazing. High quality true synthetic oil and maxima fft air filter oil really pays off.


I wish I could put that many hours on my bikes. I am lucky if I can get 100/yr. I am only at about 35 this year due to injury/illness.:thumbsup:





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