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10-25-2019, 07:28 AM | #1 |
Senior Member
Join Date: Mar 2014
Location: Midland Park,N.J.
Posts: 1,108
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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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10-25-2019, 08:03 AM | #2 |
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Join Date: May 2010
Location: Grafton,OHIO
Posts: 727
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Re: Engine won"t idle
Head Gasket? Maybe valves #2 also
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10-25-2019, 08:30 AM | #3 |
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Join Date: Oct 2017
Location: Kingwood Texas
Posts: 30
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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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10-25-2019, 09:29 AM | #4 |
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Join Date: May 2010
Location: Long Island, NY
Posts: 3,470
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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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Bob Bidonde |
10-25-2019, 10:46 AM | #5 |
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Join Date: May 2010
Location: So Cal
Posts: 8,754
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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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10-25-2019, 02:06 PM | #6 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: Engine won"t idle
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10-25-2019, 08:43 PM | #7 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: Engine won"t idle
Check for vacume leaks .
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