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Old 07-26-2003, 10:40 AM
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bike question

okay, this is a bike question, so bare with me since alot of folks here have bikes and know their stuff and plus it's a hotrod bike, so you know.....

anyways my bike previously had 16" off shorty header pipes, but I wanted the rumbly backing off sound of longer pipes. I put on a set of 40" long 1 3/4 drag pipes and it sounds great, except when I let off the throttle it will backfire through the pipes a couple of times. I've tried adjusting the carb and it has helped some (leaning the carb made a noticable improvement but hasn't made it go away). is there something else I need to do to make it stop backfiring through the pipes? she's real picking about where the timing is set so I don't wanna mess with that until someone who knows more than me suggests it. if any one has any ideas I'd love to hear them.
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Old 07-26-2003, 01:27 PM
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yes thats a hard problem to deal with and the better the engine runs the worse the problem seems to get sometimes, whats usually happening is under decelleration vacume is a little higher than it is while normally ideling, the carbs cant compensate for higher than idle vacumes due to fixed mixture settings causing missfires from overly lean conditions, miss fires are unburnt fuel weather rich or to lean, then what happens is the unburnt fuel ignites in the pipes due to heat usually from the lean conditions, leaning the fuel mixtures (idle mixtures) out even more just gives it less fuel to work with minimizing the problem but not solving it , fuel injected engines simply cut out the fuel all together untill the map (vacume) sensers see the right vacumes, mass air flow stuff can add the right amount of fuel to compensate but thats fuel injected stuff , the manifactures usually design systems that dump large amounts of air between the carbs and the valves using manifold pressure sencing valves letting the enging draw air from an outside source creating less vacume threw the carbs and sending mixtures so lean there no way they could ever fire even with exhaust heat solving the problem. some people just put enough mufflers on them till you cant hear the problem. hope i could be of some help good luck mikey
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