I need some advices about backfiring
#1
03-27-2005, 02:46 AM
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I need some advices about backfiring
Last spring I bought a !991 Harley-Davidson for the first time. I was so exicited about it and I rode most of the summer to work and back daily. One Late afternoon just before I went to start my bike and it backfired like crazy. I called the bike mechanic about the backfire and he said it was very common. He suggested I changed the spark plugs and bought the splitfire sparks. Problems solved but it backfired again in the next month. I changed them again and it was better for awhile. Is it odd to change the spark plugs often in one whole summer?? Any tips, bikers??
#2
03-27-2005, 03:25 AM
#3
03-27-2005, 08:57 AM
#4
03-27-2005, 09:25 AM
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RE: I need some advices about backfiring
What is your starting procedure? And are you shutting the petcock off when you shut the engine off?
My '87 will backfire when I start it if a little gas happens to be in the cylinders. It also does it if the engine is started, shut down, and immediately restarted. Never does it when I follow my regular starting procedure: Check in neutral, choke on, ignition on, 1/4 throttle, hit starter switch. When bike starts, turn petcock on. As bike warms, ease off choke. When cylinders/heads somewhat uncomfortably warm to hand, ride off slowly until engine warmed to normal operating temperature, further easing choke off as needed.
It's possible for some gas to be leaking into the engine. If so, get the carb float valve adjusted/replaced ASAP. You could also have some bad gas, especially if it sat this winter without being stabilized. Weak ignition, from bad wires, cracked coil, or ignition module could cause it, too.
Put some fresh gas in, start the bike in the dark, and look for any "glow" around the plug wires. If seen, replace the plug wires.
My '87 will backfire when I start it if a little gas happens to be in the cylinders. It also does it if the engine is started, shut down, and immediately restarted. Never does it when I follow my regular starting procedure: Check in neutral, choke on, ignition on, 1/4 throttle, hit starter switch. When bike starts, turn petcock on. As bike warms, ease off choke. When cylinders/heads somewhat uncomfortably warm to hand, ride off slowly until engine warmed to normal operating temperature, further easing choke off as needed.
It's possible for some gas to be leaking into the engine. If so, get the carb float valve adjusted/replaced ASAP. You could also have some bad gas, especially if it sat this winter without being stabilized. Weak ignition, from bad wires, cracked coil, or ignition module could cause it, too.
Put some fresh gas in, start the bike in the dark, and look for any "glow" around the plug wires. If seen, replace the plug wires.
#5
03-27-2005, 12:29 PM
RE: I need some advices about backfiring
what he said
ORIGINAL: pococj
What is your starting procedure? And are you shutting the petcock off when you shut the engine off?
My '87 will backfire when I start it if a little gas happens to be in the cylinders. It also does it if the engine is started, shut down, and immediately restarted. Never does it when I follow my regular starting procedure: Check in neutral, choke on, ignition on, 1/4 throttle, hit starter switch. When bike starts, turn petcock on. As bike warms, ease off choke. When cylinders/heads somewhat uncomfortably warm to hand, ride off slowly until engine warmed to normal operating temperature, further easing choke off as needed.
It's possible for some gas to be leaking into the engine. If so, get the carb float valve adjusted/replaced ASAP. You could also have some bad gas, especially if it sat this winter without being stabilized. Weak ignition, from bad wires, cracked coil, or ignition module could cause it, too.
Put some fresh gas in, start the bike in the dark, and look for any "glow" around the plug wires. If seen, replace the plug wires.
What is your starting procedure? And are you shutting the petcock off when you shut the engine off?
My '87 will backfire when I start it if a little gas happens to be in the cylinders. It also does it if the engine is started, shut down, and immediately restarted. Never does it when I follow my regular starting procedure: Check in neutral, choke on, ignition on, 1/4 throttle, hit starter switch. When bike starts, turn petcock on. As bike warms, ease off choke. When cylinders/heads somewhat uncomfortably warm to hand, ride off slowly until engine warmed to normal operating temperature, further easing choke off as needed.
It's possible for some gas to be leaking into the engine. If so, get the carb float valve adjusted/replaced ASAP. You could also have some bad gas, especially if it sat this winter without being stabilized. Weak ignition, from bad wires, cracked coil, or ignition module could cause it, too.
Put some fresh gas in, start the bike in the dark, and look for any "glow" around the plug wires. If seen, replace the plug wires.
#6
03-27-2005, 12:33 PM
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