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ryanheacox · 10-25-2019, 12:24 PM

Lacquer thinner is great at dissolving stuff so might be worth a shot. Definitely worth trying that before taking stuff apart. MMO usually seems to do the trick for most people but maybe you have more varnish than most. Whats the history on the engine?

I've only ever had issues with valves sticking on engines that hadn't run in a long time. Exercising the valves with WD-40 always freed them up.

10-25-2019, 12:24 PM	#2
ryanheacox Senior Member Join Date: Apr 2013 Location: Northwest CT Posts: 1,092	Re: Number 8 Exhaust Valve sticking Lacquer thinner is great at dissolving stuff so might be worth a shot. Definitely worth trying that before taking stuff apart. MMO usually seems to do the trick for most people but maybe you have more varnish than most. Whats the history on the engine? I've only ever had issues with valves sticking on engines that hadn't run in a long time. Exercising the valves with WD-40 always freed them up.