imported post
mjpliv wrote:
I found this on another forum -
[suP]my goldwing back fired at a idle stalled and when i started it back up it ran real rough the timing belts are still in time i went though carbs has good spark running out of ideas[/suP]
Any words of wisdom for me to pass along?
[suP][/suP]
Yah, try some punctuation. It'll help out a lot!
But, backfiring... I would have him check the valves. If an exhaust valve isn't sealing for whatever reason... (Carbon fouling, damaged lifter, sticking guide, bent stem, out of adjustment, etc.) it will lead to backfires. Also would need to know what cyl's it was coming from. Consistancy, does it lessen as the bike warms up?
Another thing to look at is the connection to the ignition system. Poor spark can cause backfires. If the plug doesn't fire while under compression (Which DOES happen), it will spark again on the top of the exhaust stroke (Remember, these are wasted spark engines) and will ignite the unburned air-fuel mixture that is leaving the cyl. Check the connections to the coils, check the coils, coil wires, plug boots, and plugs.
I know he said it has good spark, but I need to know how he tested it. If it was by pulling the plug out, grounding the strap, and cranking the engine, then he doesn't know if it has good spark, just that it has A spark. The thing to do is get an inline neon tester, and see if it lights up on you. You can get them for $10 at auto parts stores. It's not to be confused with a circuit tester. All you do is pull the plug wire off, snap this thing onto the plug, snap the other end of the tester into the wire, and crank away. It won't light up unless the plug is sparking.