Hi
Can someone tell me the correct piston clearance? Need to bore the cylinder to the next oversize. How much MM clearance should there be?
Thanks
That would depend on what brand and type of piston you use.
Im looking to use the pistons supplied by Yambits
https://yambits.co.uk/rd350-piston-kit-100mm-p-53222.html
The factory manual says .04mm (.0016") but .05mm (.002") adds a little safety factor to prevent seizures. Bore it to a size that will allow the last .002" be done with a good hone to remove the bore tool fracture marks and be left with a good surface.
.002 is fine on those. the clearance is on the box usually.
I send the jugs with the pistons to the machine shop and everything comes back ready to install with clearances already sorted.