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Good day,

Backfiring is most often caused by a lean fuel mixture.
Your carb may have plugged jets.
Also look for any gasket leaks on the exhaust system.

Good day,

The white wire is yellow on most, it goes
To "C2" on the ignition switch.

The black wire goes up to your ignition coil and
Also up to the ignition switch "IG"

The green wire goes...