Timing help!!

advance the timing and tune the carburetor.

Set it [for now] at 34* total @3000'ish rpm, drive it then look at the plugs and report with pics.

Try playing with the pump shot adjustment on the front and see if it likes more or less, 3 settings before shooter changes are necessary.

But really need to see the plugs to tell if it's fat or lean, though backfiring out the pipes sounds like retarded timing and or way too rich.

what cam?