Backfire Under Load

[cowboyclint]

Hey All,
Need help with an issue. Recent head replacement. Added MAF headers. Dizzy Recurved by Jim C. Weber 32/36 carb. After rebuild, I'm now getting backfire through the carb under load. In Neutral in the driveway, no problems. Out for a drive, backfire and some low power when switching gears. If I take it slow and steady as I increase speed, not too many backfires, but if I push it a bit I get a lot. Timing is set at 7 BTDC. Any Thoughts? Thanks.

 

[cowboyclint]

Adding some additional info: Fully desmogged, vaccuum from the carb to the dizzy connected to the outer (advance?) port, and the inside port is capped.

 

[NeverGiveUpYota]

Sure you dropped the diz in perfect? Could it be off a tooth making the timing advanced more than you believe?

 

[NeverGiveUpYota]

Googled real quick. I always have to remind myself. Stuff just doesn’t stick.
If your running lean your carb will pop. I know nothing of a Weber so seek help in that arena in the search bar.

 

[cowboyclint]

Thanks for that. I seemed to be running rich before, and did a bit of reset on the carb, so I might have it too lean. I'll look more specifically for some Weber tweaks

 

[FJACS]

Weber 32/36 Backfire

 

[cowboyclint]

Well some people are better at using the right words in the search bar than I am......
Out to see what I can come up with. Thanks.