what would cause a 2002 c-10 to backfire thrrough the exhaust? it is imtermittent and not when pulling out. more gliding to a stop. bike was running a little funky then started backfirig. but the engine smoothed out.
had the carbs rebuilt in August. then the bike ran great. sat for a month and started acting up.
If it is when you have the throttle shut, it's probably an exhaust leak. Somewhere the exhaust is letting fresh air in and the un-burned or part-burned fuel is igniting in the exhaust. So, either you are running very rich and still have the PAIR valves fitted, or you have a leak in your exhaust. Check the balance pipe, where the headers bolt to the engine, and where the muffler attaches to the header.
I thought popping on overrun was lean? http://www.mikuni.com/tg_backfires_in_exhaust.html If no exhaust leaks maybe there's still junk in the carbs, Check the intake boots by spraying carb cleaner and listen for RPM changes.
If you paid for the carb job take it back. I would. If the tech didn't soak them long enough and chase the passages with a strand of throttle cable before blowing them out he didn't do it right.
I haven't had carbs cause backfiring issues after a long storage period. Just hiccups and low speed rpm issues. Redo the carbs after you eliminate any exhaust problems.
One month??... I have had jets blocked from sitting 3 weeks. You may have to dump that fuel ..drain the bowls... and try fresh fuel. Are you adding a capfull of two stroke oil to each tank of gas? Stabilizer? Anything? Ethanol free fuel?
I'm done with this bike. I believe it was severely damaged by leaking carbs.
When I got the carbs back it ran like a top, that was May.
last week I started it up, there was a decided thump, like one cylinder wasn't firing. made a mental note
last night started it again & things got ugly. Started backfiring, the thump went away but I stopped for gas & it wouldn't start and run without the enricher on full. No power in the throttle. There was a metallic ping when it ran.
So I am tired of this machine and an offering it to anybody who wants it for free. I live in Marlton NJ, come get it. If transportation is a problem I will gladly get the sawzall and chop it up into manageable parts for you.
carbs were done by popular person on this board. thought i was home free. valve is on run and been leaking for 2 days. nowthe neighbor is complaining about the smell. i have just had enough.