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Old 11-27-2013, 09:38 PM   #2
Joined: Oct 2010
Location: Nor Cal, USA
Oddometer: 2,323
I went through this not long ago. First step...take the cylinders and pistons to a good machine shop and pay them to take good measurements. Max clearance is 0.120mm, which is basically huge--4.7 thousandths. If you're at 3 thou or less, flex hone them, buy next size up rings and trim ends to fit.

Oversize pistons are only for reboring to next size up.

Unless it's a race motor, button it up and run it.
1974 R90/6 motor w/1050 kit; twin plugged; installed in...1970 R60/5 frame; RM125 front end; KZ1000 Police Tank.
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