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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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Old 09-24-2009, 10:28 AM
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SpeedyManiac SpeedyManiac is offline
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Default 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


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Old 09-24-2009, 10:35 AM
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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.
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Old 09-24-2009, 05:02 PM
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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
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Old 09-24-2009, 05:40 PM
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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
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Old 09-24-2009, 09:53 PM
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Also depends somewhat on what piston were talking about. I'm assuming the now OEM Vertex.
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