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Posted by Troll
- August 14, 2015, 07:58:12 AMI know what you wrote, but there are two distinct kinds of "backfiring" that people lump into one category. An actual backfire occurs when unburned fuel ignites in the exhaust and the sound is much like that of a shotgun. Sometimes this happens as series of pops and bangs usually on decel, and is normally caused by air getting into the exhaust system and helping to ignite unburned fuel in the exhaust that would normally just be expelled. A pop back through the intake, causing a noise and small explosion in the air box is the other type. Exhaust pop is caused 99.9% of the time bu an ignition problem, the other type by a lean, unburnable fuel mixture. Whatcha got? Surging is another one of those problems that is often hard to describe. Most common surges are caused by a lean fuel mixture, and feels like you are in a rocking chair, or perhaps riding into a headwind.
Posted by wayne
- August 13, 2015, 20:54:35 PMHello,been a member for awhile but haven't posted anything till now.I enjoy everyones input and I could use some help.I have a 2002 1500 drifter which I bought about a year ago and have enjoyed riding so much that I sold my Harley.It has about 12,000 miles on it which I have put on about 2,000 miles.Bike ran great till I got home from a recent trip and it started surging and backfiring when I hold a steady throttle.It idles fine and you can run it through the gears hard and it doesn't miss a beat but if I'm riding at a steady MPH and steady RPM it surges and backfires.I have changed the plugs which were a nice tan color,air filter is clean, spark plug wires are all good,I changed the exhaust gaskets just to make sure they were not the problem. Bike has Cobra exhaust with no after market computer.I have added Seafoam to the gas but the problem still exists.Bike is immaculate and been well taken care of and ran excellent for the 2,000 mi I put on it,would appreciate any help as i'm out of ideas.