I looked at the parts diagram and do not see anything like air injection system like the P.A.I.R. on Suzuki's?. I would check the gasket between the header pipe and the cyclinder head to make sure it is not leaking.
Back fire depending on where it is coming from:
Exhaust:
Air getting in and igniting the unburnt fuel.
Leaking exhaust valve and some flame sneaks by sometimes. Leaking can be caused by out of adjustment on the tight side, bad or burnt valve.
Intake:
Same as exhaust leaking valve.
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