cylinder pics: unusual wear?

2 replies to this topic
  • stringbeanWilly

Posted January 09, 2010 - 02:15 PM


'06 yz450f. Im pulling it apart this winter to check condition, as i picked it up used couple of months ago. Previous owner said it had roughly 50 hrs.
It has run strong, but its snowing outside, and im currious, want to learn...

the marks on the sides of the top of cylinder are not what i expected. I havent measured it yet (need my calipers), and will obviously do so, but was just wondering what folks had to say.

I will hone it a bit and clean it up with atf if still useable, but are those marks on top the result of bad bearings or other issues in the cases, or is that normal residue from combustion? Thanks

Attached Thumbnails

  • DSC01494.jpg
  • DSC01495.jpg
  • DSC01496.jpg
  • DSC01497.jpg
  • DSC01499.jpg

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

Posted January 09, 2010 - 02:30 PM


you need to measure it. The marks at the top and bottom are normal wear. The specs are listed in the book.

  • grayracer513

Posted January 09, 2010 - 04:55 PM


The marks at the upper and lower limit of travel are the result of the rings stopping and starting as they reverse direction; typical. If they disappear in 2-4 passes with a bottle brush hone, it's probably fine.

Read: http://www.thumperta...759#post4380759

Check the rings clearance in the grooves.

Related Content

WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies

Megabomb Fitment by 288yz450

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

Should I buy this bike? help....... by Numsa Hul

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  30 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.