2010 YZ450f tear down, valves look odd? Expert opinion?


24 replies to this topic
  • baxterj787

Posted April 30, 2011 - 11:07 AM

#21

In response to the valve discoloration: I wonder where the open end of the electrode aligns in the combustion chamber. That MIGHT cause a combustion pattern that would make one valve hotter than the other. The Easter Bunny might be real too...:thumbsup:

  • thestuz

Posted April 30, 2011 - 04:20 PM

#22

about the valve, it looks like the hotter valve might be due to bad sealind between the valve and seat, causing heated gasses to heat it up more?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • yz450fcranker

Posted May 04, 2011 - 12:53 PM

#23

i have more than 200 hours on my 09 yz450f and im not going to open the engine like yamaha said dont fix whats not broken unless its nearly broken

  • Aka.Goose

Posted May 04, 2011 - 07:58 PM

#24

i have more than 200 hours on my 09 yz450f and im not going to open the engine like yamaha said dont fix whats not broken unless its nearly broken

I'd place a bet that in the long run Davey will spend much less on his bike than you will (or the poor sap that buys it from you)...And nothing worse than being on a long ride with the "I don't fix it until it's broke guy" when his bike breaks...

  • RobbieM16

Posted May 04, 2011 - 09:24 PM

#25

i have more than 200 hours on my 09 yz450f and im not going to open the engine like yamaha said dont fix whats not broken unless its nearly broken


I hear you completely,, I pulled 280 hours on my 02 CRF without pulling nothing but the valve cover off to do the valves. Never had a problem, and still ran as good as when I pulled it off the showroom floor in 2001 10 years later.. If it still runs now with the new owner, is a different question.. My maint. was done at every ride since I bought it,





Related Content

Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

YZ450F 03 Sparks driving me crazy by SirAttard


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
Forums
Photo

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
Forums
Photo

First Hare scramble tips by dhend8


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

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.