yz450f top end maintenance, when to rebuild ?


1 reply to this topic
  • leanjay

Posted January 30, 2008 - 10:13 PM

#1

i have a well used yz450f,i'm wanting to freshen it up over the winter,i have a couple of question first. whats the best way to tell when the timing chain needs replaced and second, what is the specs. on piston and ring wear? the third question is does anyone ever install the weisco 13.5 to 1 piston in an totally stock yz450f. any help on these three questions would be greatly welcomed. thanks

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

Posted January 31, 2008 - 06:36 AM

#2

If you don't find any kinking or binding links, the degree to which you can bend the chain sideways is an indication of the wear at the pins and bores. However, let's be realistic; the chain is a $15 part. Replace it.

It sounds like you don't have a manual to look your specs up in. You can download one here:

http://www.yamaha-mo...ice/manuals.jsp

The cylinders are aluminum plated with Nikasil. They should be replaced, or bored and replated, if there is any measurable wear, or any score marks that won't come out in 4 quick passes with a ball hone.





Related Content

Forums
Photo

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
Forums
Photo

First Hare scramble tips by dhend8


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

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

Megabomb Fitment by 288yz450


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

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
 
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.