Quote:
Originally Posted by Mudflap
If the piston and rings are good that leaves the valves or head gasket. When you had the head off did you try pouring gas into the upside down head to see if there was any leakage through the valves. One time I over oiled a foam air filter which caused a buildup of carbon on the back of the intake valve. A tiny flake of carbon came off and got stuck under the valve causing a loss of compression.
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I'll try pouring some petrol down the head tomorrow see if any comes through. Yeh when I took the head off I cleaned all the carbon from the top of the valves and piston.
I did find a smc ram 170cc manual online and the valve clearence in the manual says 0.05 in 0.05 out but I tried that and still won't start