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30ccpickup · 06-09-2016, 01:20 PM

Backfiring Under Load (throttle wide open at relatively low rpm’s) often indicates a problem in electrical/ignition/timing.

Culprits include:

Insufficient point gap (should be set at .018 to .020)
Timing
Bad condenser
Bad distributor body
Frayed wire between upper plate and lower plate on the distributor
Intermittent connection of the ignition switch

As Mitch said I, would start with point gap.

06-09-2016, 01:20 PM	#8
30ccpickup Senior Member Join Date: May 2010 Location: Wakarusa, IN Posts: 928	Re: 30 Zenith Carb Backfiring Under Load (throttle wide open at relatively low rpm’s) often indicates a problem in electrical/ignition/timing. Culprits include: Insufficient point gap (should be set at .018 to .020) Timing Bad condenser Bad distributor body Frayed wire between upper plate and lower plate on the distributor Intermittent connection of the ignition switch As Mitch said I, would start with point gap. __________________ http://MODELABASICS.com/ How Things Work on a Model "A" Ford Fordbarners, Feel free to use the pictures on my site to answer questions and create tutorials/tech articles.