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Old 10-25-2019, 07:28 AM   #1
rocket1
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Default Engine won"t idle

On returning from a 60 mile ride whenever I stopped the engine would die,checking it out at home I could hear a miss in the exhaust pipe and a crackling noise at the carb.I took a compression test and found only 40 lbs at number one cylinder and 60 to 70 on the others.I pressurized #1 cylinder with 60 lbs air at top dead center,air leaks out the carb;also with the #2 plug out the air will come out #2 cylinder while #1 is under pressure.I assume #1 intake valve is not seating or burned but why is air coming out # 2 plug hole?
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Old 10-25-2019, 08:03 AM   #2
Ray64
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Default Re: Engine won"t idle

Head Gasket? Maybe valves #2 also
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Old 10-25-2019, 08:30 AM   #3
29closedcabguy
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Default Re: Engine won"t idle

If #1 is finishing compression cycle and the intake valve is not completely closing and #2 is in it's intake cycle with the intake valve open you could have this condition. You might try your test with the #1 piston more retarded in its relative position were the #2 intake is positively closed.
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Old 10-25-2019, 09:29 AM   #4
Bob Bidonde
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Default Re: Engine won"t idle

You have done the right checks, so it's time to remove the cylinder head, and open the valve chamber. Your best expectation should be a failed head gasket and a burned valve.
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Old 10-25-2019, 10:46 AM   #5
Bob C
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Default Re: Engine won"t idle

Don't think there would be good compression in #2 if gasket was blown between 1&2.
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Old 10-25-2019, 02:06 PM   #6
Patrick L.
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Default Re: Engine won"t idle

I don't think I'd worry about the head gasket just yet. Could the #1 hole have a sticky valve ? Have you checked the lash on that valve ? If that valve is bad it could leak into #2, in that case the head would need to come off.
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Old 10-25-2019, 08:43 PM   #7
Purdy Swoft
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Default Re: Engine won"t idle

Check for vacume leaks .
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