Britbike forum Forums British Motorcycle specific Brands Bsa bulletin board Timing? carb jet or exhaust?

I have 2 days riding the new old AMAL on the bike and when I get off throttle or do and aggressive engine braking I get a blue flame out of the muffler. It is not overheating ie red header or chirpping, ticking after ride or tappet heat noise. It starts well after prime and has smooth acceleration. I moved needle from top to middle and the blue flame became more pronounced as per more fuel loading I expect but same secondary ignition. I have cracked the throttle and nothing broke but need to ditch the blue flame if I expect to go to a filling station safely. LOL! Points gap set no strobe but only changed carb body and fixed points in place no change to timing which was not popping a blue flame. Looks cool after blipping throttle but cannot be good.
steve

Air leak at head where the pipe fits ?

+1. My old army B40 used to do this great for keeping cars off your tail in traffic

You got it Toyota! shimmed it up and had to re-tighten the motor mount bolt so caught that early too. Started making it a packhorse too as I gradually became more creative with lack of sleep after my friday night graveyard shift which is actually a monday night so not many birds at the bar.

LOL!
S