440 sleeve

[kc7314]

My bike 400ex is/was configured as a 425 w/ross 11:1 piston and was wondering if the sleeve could be bored to 440 range safely or do i have to buy a new sleeve? The sleeve is roughly 5/32 thick a the top.:grr:

[Colby@C&DRacing]

the easiest way to tell would be to take the cylinder off and see if there is still a groove for the large oring on the bottom or measure the wall thickness of the sleeve from the bottom. Or if you have a picture of the top of the cylinder I might be able to tell you if it has a new sleeve.

[kc7314]

the o-ring is still on the bottom of the cylinder but it looks as if it don't fit right.