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Misfiring bandit


Guest Manxzookie

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Guest Manxzookie
Posted

Just built a bandit top end and had the carbs ultrasonic cleaned  I've replaced the standard exhaust with a full cobra system . to try and eliminate the backfire on the overrun I've raised the needles 1 notch  she ticks over fine and revs ok but the backfires horrendous  with a flame  to follow  any ideas ?  Ps it's a mk2 1200 ;)

Posted

Yeh try dropping them lol. Seriously, have you checked your cam chain, ign timing etc? flaming on the overrun is a sign of excess unburnt fuel in the exhaust. I'm sure if I'm wrong someone will pipe up :)

Posted

Actual flames that are burning and not just from the bang is a rich condition but bangs on over-run points to a lean condition / exhaust air leak! Have you done the PAIR mod as that would cure one likely source, others would be poor joint sealing. just raising the needle isn't gonna help with a Cobra pipe - ideally a designed needle and a MJ swop will be required.

Guest Manxzookie
Posted (edited)

I'm going to dump the pairs  fit new exhaust gaskets and raise the needles 2 notches  see how that pans out and rejet if req 

Edited by Manxzookie

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