Reply to "UPDATED - Backfire under Low RPM / Load (4th or 5th Gear)....."

Thanks, all -

Took the carb out to Braswell, walked in and had it professionally gone through.

2 problems found:

1. "Leaky" Secondary Power Valve (Doug was right on!). The valve was definitely no good, would respond to vacuum, but would leak out over 4-5 sec.

I suspect that is the cause of my richness, black rear plugs, and inability to adjust the idle.

2. "Leaky" Primary Accelerator Pump Diaphragm.

But we will let the data (results) lead us.



That place (Braswell) is amazingly great. I walked in, got a very good lesson in carb rebuilds by a pro (Chris), got all my questions answered, got my carb reworked, with no appointment, and no hassle. Also picked up catalogs and cool Braswell stickers.


Plus you should see all the "stuff" they have in there! You should see the size of these racing carbs!