nytrdr24
+1y
hope you made it to work ok, check out this when you get a chance, good reading & it may help you a little.
you say its a dfav, that is a water choke model, is it hooked up? this might be an issue to look at, but more than likely not the problem....
the header glowing is like you said a lean issue and it wouldn't be loading up with that going on,you said you check'd the timing and it is running better, header isn't glowing, but now it still is popping in the exhaust,
sounds like somehow your still getting unused fuel in the exhaust that is causing the popping. the mixture screw may be set just slightly too rich..either that, or the intake valve is staying open after the combustion and extra fuel is getting pulled into the cyl, and then out with the exhaust gasses then igniting in the exhaust pipe causing the pop....
best I can say is double check the timing, and the mixture screw & hopefully that will fix it....keep us posted