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The first thing I would do after a low compression test is check the valve clearance.

If its a 2 cycle, a burnt piston/ring. 4 cycle may have brunt valves/piston/rings.

AnswerI agree with above but would like to add head gasket or loose spark plug could be a contender as well but less likely then rings or valves, first ensure spark plug is installed correctly and if it is then remove exhaust headers and slowly crank motor past TDC a few times listening for hissing sounds, if not exhaust repeat with the inlet manifold if still not the problem then if capable remove head and check for noticable wear/damage on the sleeve, head gasket(usually diagnosed by looking for carbon deposits starting from the bore shooting out towards the outside of motor) and piston top and also check the piston ring/sleeve gap. imo if you get the head off and you can afford it replace the rings while your there ;)
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โˆ™ 2011-11-13 02:12:15
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Q: Why do you have no compression when trying to start your bike?
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