yz125 piston pics

ImageUploadedByThumper Talk1381893685.077648.jpgImageUploadedByThumper Talk1381893717.061264.jpgImageUploadedByThumper Talk1381893748.007110.jpgImageUploadedByThumper Talk1381893769.161728.jpgImageUploadedByThumper Talk1381893852.241828.jpg

so i took apart my 03 yz125 cause there was a knocking sound... how does it look?

Looks wore out.  Measure the bore to make sure it is within spec and change those pistons more often.

Like 1987 said, it looks wore out. But you do have to measure it to be sure.

Always have new ones layin around due to just stealing rings lol!

1381945809084.jpg

Looks quite lean how do you mix? That apart the piston looks overdue.

You heard a knocking sound? How is the rod and crank? Most of the time knocking comes from the bottom on a 2t.

You heard a knocking sound? How is the rod and crank? Most of the time knocking comes from the bottom on a 2t.

The rod and crank look great

Looks quite lean how do you mix? That apart the piston looks overdue.

I mix 32:1

WAY worn out!!,,and i'd bet the cylinder is out of spec too.

The wear from the bridge on the exhaust side of the piston usually starts showing up when piston to bore clearances get excessive.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now