[David Penwarden]

I would use the standard clearance, 0.04mm. So if you use a 70mm piston the bore will be 69.96mm finished size. Who ever is doing the rebore should measure the skirt diameter to check the marked size. I have run 600 miles since the rebore on my engine with a 0.04mm clearance and all seems fine. I am always careful with running in.

[David Penwarden]

Sorry for the delayed reply, I have had the bike running now for a few weeks and completed c.370 miles and all seems OK at present. I ended up with an Almot piston with the bore done to give the standard clearance, on the face of it this looked like a tight clearance but is running in well.

[David Penwarden]

Thanks Keith and Ollie, I will have a look at those suppliers.

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