I

That would sound like twice the clearance needed. i.e., 1mm=.039"

Hi Barfy

your suspicion would be correct... i would expect the clearance to be somewhere between .002" and .004"maximum depending on design etc.

Converting that to metric, thats .05mm to 0.1mm max.

All things considered, the piston to bore clearance 0.58mm is unusable.

just checking, are you measuring the piston skirt below and at right angle to the gudgeon pin?

Dom

I have done the rebore with a clearence of 0,02 -0,03 mm.

Hi Barfy

your suspicion would be correct... i would expect the clearance to be somewhere between .002" and .004"maximum depending on design etc.

Converting that to metric, thats .05mm to 0.1mm max.

All things considered, the piston to bore clearance 0.58mm is unusable.

just checking, are you measuring the piston skirt below and at right angle to the gudgeon pin?

Dom

Thanks Dom and all,

Panic over. Using my callipers the piston is about the same measurement on the skirt below and at right angle to the gudgeon pin.

The top of the piston seems to

The top of the piston expands more then the skirt when hot.