312hoss 0 #1 Posted February 7, 2012 Hi RS members,I have 1989 310-8 with a back fire issue.I was reading somewhere about sometype of backfire adjustment or something.Any advise or help would be very much appreciated. It is a 10 hp magnum. Thanks,Bill :) Share this post Link to post Share on other sites
can whlvr 994 #2 Posted February 7, 2012 sounds like a little carb adjustment needed,its the high speed needle on the top of the carb,slowly adjust and see if that helps,also check for a loose throttle shaft,they wear out and let too much air in,could need a throttle shaft rebuild kit Share this post Link to post Share on other sites
Sparky-(Admin) 23,219 #3 Posted February 7, 2012 I think the big issue is that after you kill the ignition the motor continues to spin a bit and any gas it sucks in gets ignited by the hot exhaust. Try running it down to an idle and after you kill the ignition, engage the PTO which will help stop the motor from turning over as much with the ignition off. Just an idea but probably not a real fix. Mike............ Share this post Link to post Share on other sites
312hoss 0 #4 Posted February 7, 2012 Thanks,Don i will give that a try tomorrow. I have tried idling the motor down but it still backfires Share this post Link to post Share on other sites
can whlvr 994 #5 Posted February 8, 2012 as to what sparky said is true and ive heard sometimes if an exhaust is full of crap it can heat up and have embers inside that ignite the unburned fuel too,my 414-#2 had this,i put a new cheap exhaust on and she runs great Share this post Link to post Share on other sites
dadstractor1 5 #6 Posted February 8, 2012 i had that problen replacted points took care of it dadstractor Share this post Link to post Share on other sites
Sparky-(Admin) 23,219 #7 Posted February 8, 2012 i had that problen replacted points took care of it dadstractor Bill's tractor is a Magnum...no points. Mike........... Share this post Link to post Share on other sites
zieg72 209 #8 Posted February 8, 2012 I don't know if this makes any sense but I have thought it may be the gas going bad, loosing octane. Seems like if mine has sat for a while it does tend to backfire some but with fresh gas it didn't backfire at all... My $.02 Share this post Link to post Share on other sites
