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31Abone · 10-25-2019, 01:23 PM

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..

10-25-2019, 01:23 PM	#7
31Abone Senior Member Join Date: Apr 2013 Location: Big pine Ca 93513 Posts: 797	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..