Top End Clearances/Specs
 

Need some quick answers, can't find them anywhere. What are the tolerances for piston/bore clearance? I've heard 0.06mm, but need max/min numbers.

Thanks,

Steve

one and a half thou of a inch min, max is up to you but I dont like to run more than .003 inch, two stroke sleds are known to run seven thou on fresh cast pistons.

Good info on this link (go to the long post) :
http://www.thumpertalk.com/forum/arc.../t-430827.html

I have the official GasGas numbers somewhere I'll see if I can find them. - Ken

This is from the GasGas 2006 shop manual:

Clearance between piston and cylinder:
200 std:0.05mm , limit: 0.10mm
250 std:0.055mm , limit: 0.10mm
300 std:0.06mm , limit: 0.10mm
Ring Gap:
200 std:0.3mm , limit: 0.6mm
250 std:0.4mm , limit: 0.7mm
300 std:0.5mm , limit: 0.8mm
Cylinder Bore:
200 std:62.50mm , limit: 62.60mm
250 std:66.38mm , limit: 66.50mm
300 std:71.99mm , limit: 72.10mm

Also depends somewhat on what piston were talking about. I'm assuming the now OEM Vertex.