spark issues

[rodm]

i am at wits end i have a 86 venture having spark issues on no.1 cylinder it wont spark at idle but works at 4000 rpm i have replaced the coil,the wire and the boot with no positve results can anyone give me a solution instead of scrapping the bike like everyone says thank you everyone

[saddlebum]

i am at wits end i have a 86 venture having spark issues on no.1 cylinder it wont spark at idle but works at 4000 rpm i have replaced the coil,the wire and the boot with no positve results can anyone give me a solution instead of scrapping the bike like everyone says thank you everyone

Get your self a spark tester , not the enclosed one but one that has an adjustable gap from 0"-1" or 1&1/2", they are cheap about $5, this way you can check your spark strength, it should easily jump a 1" gap or compare to a good cylinder. If the spark is strong try another plug, even new plugs can go bad. If it is weak check your wiring for bad grounds dirty or corroded connections faulty primary wires.

[Gambler]

What about the spark control box underneath the air filter box

 

Gambler:15_8_211[1]: