YZ450F 2003

2 replies to this topic
  • 010101

Posted June 08, 2016 - 11:34 AM


How do I find out which piston to use a b c or d?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • billygildark5007

Posted June 08, 2016 - 06:28 PM


There's only one size oem piston to use...

  • grayracer513

Posted June 09, 2016 - 07:04 AM


One size only UNLESS you go to an aftermarket piston.  Certain aftermarket suppliers offer alternate sizes. 


The right way to choose in those cases is to have the bore prepped correctly, then measured professionally to determine its actual minimum and maximum size.  If it passes muster as far as wear tolerances, then you find the piston size that gives the most correct clearance numbers. 


The simplest, and one of the most reliable choices, is the stock Yamaha piston.

Related Content


The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  94 replies

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 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.