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Wick · 12-13-2019, 06:07 AM

Your intake port should look normal,exhaust will be wet from oil. A leaky gasket will cause engin to backfire when you let off. Your top ring gives you the good compression, 2nd ring helps wipe the oil from the cylinder *could be broke/stuck/ . Oil ring * broke/stuck,worn out.
Try this....warm up engine, bring #4 to TDC and pour Seafoam into that cylinder. Let it sit a few
hours then turn motor over 1 time and repeat. Let sit overnight.
Add some seafoam to the gas tank. Go for a drive. You will have to change out the plug 1 more time.
After about 10 miles or so,the ring should start working again. Only if it's stuck.
Im guessing this motor sat for some time?

12-13-2019, 06:07 AM	#8
Wick Senior Member Join Date: May 2010 Location: Gwynn's Island Va Posts: 1,389	Re: Running on 3 1/2 Your intake port should look normal,exhaust will be wet from oil. A leaky gasket will cause engin to backfire when you let off. Your top ring gives you the good compression, 2nd ring helps wipe the oil from the cylinder could be broke/stuck/ . Oil ring broke/stuck,worn out. Try this....warm up engine, bring #4 to TDC and pour Seafoam into that cylinder. Let it sit a few hours then turn motor over 1 time and repeat. Let sit overnight. Add some seafoam to the gas tank. Go for a drive. You will have to change out the plug 1 more time. After about 10 miles or so,the ring should start working again. Only if it's stuck. Im guessing this motor sat for some time?