Bought a head,piston kit,valve cover and rockers and timing chain guides cam and cam sprocket I set the timing and got no compression can you tell me why?
Obviously it's a 4 stroke. If assembled correctly most common cause for no compression are valves that are not adjusted correctly. Too tight. When one or more do not close all the way it can not seal to create the compression you need.
If its a 2 stoke,"takes gas oil mix", piston in backwards,, ,,,,if its a 4 stroke "takes gas only"...rocker arms need adjusted, or cam not set in proper place during resembly "out of time". Or a. Bent valve/valves,,,in the head, valve will have to be replaced
SOURCE: 4 wheeler 250cc no compression
it needs a set of rings and maybe a piston then it will be like new again
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