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jg61hawk · 08-11-2021, 01:29 PM

Fuel, Spark, Compression and Timing. So shut off all gas, remove all plugs, ground plugs to head have dad crank put thumb over plug hole watch plug...as your thumb tests the compression you look for plug to spark....do all 4. Now you checked spark and compression and timing (shade tree style). Did your thumb get pushed off the hole? Did the spark occur at the exact time? Let's say yes...Now leave fuel OFF and crank...now spray a few shots into carburetor with gas off (this way it's not flooded.) Does it run or only backfire? Backfire still....possibly bad condenser. Does it run on starting fluid for a second or two....carb is no good....probably float issues...flooding. Just my opinions as quick checks.

08-11-2021, 01:29 PM	#16
jg61hawk Senior Member Join Date: Oct 2014 Location: Central New Jersey Posts: 428	Re: 1929 double a won't start, help Fuel, Spark, Compression and Timing. So shut off all gas, remove all plugs, ground plugs to head have dad crank put thumb over plug hole watch plug...as your thumb tests the compression you look for plug to spark....do all 4. Now you checked spark and compression and timing (shade tree style). Did your thumb get pushed off the hole? Did the spark occur at the exact time? Let's say yes...Now leave fuel OFF and crank...now spray a few shots into carburetor with gas off (this way it's not flooded.) Does it run or only backfire? Backfire still....possibly bad condenser. Does it run on starting fluid for a second or two....carb is no good....probably float issues...flooding. Just my opinions as quick checks.