Re: Number 8 Exhaust Valve sticking
start the moto put some Rislone (oil additive to clean sludge etc)in intake at high revs let carb suck it in until it kills engine let it sit for 15 min..try it again. works on intake valves...in your case remove #4 plugs pour some this stuff in plug hole with ign off crank moto and let it sit for a while..
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