Backfire - Page 2 - Steve Saunders Goldwing Forums

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post #11 of 18 (permalink) Old 03-06-2019, 11:42 AM
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Originally Posted by DaveO430 View Post
It would take some engineering to get the ignition timing off. It comes right off the crank just like your 1500.

When I reread my post I can see that I wasn't clear at all about what I was trying to say. I know that some bikes were carbed and some had electronic fuel injection. When I said the ignition timing I wasn't only talking about the spark I was talking about the timing between the spark pulse and the injector pulse. I don't know if they both get their signal from the same source or not. That is why I can't be specific on the cause. My point was the conditions that could cause this backfire or misfire. Pre-ignition would cause it to backfire through the intake on the compression stroke and late ignition could cause it to backfire on the exhaust stroke. A very slow combustion could cause this too as in the case of the fuel still burning at the start of the exhaust stroke. As I said, I don't know very much about his engine so I was speaking in very general terms on things that could cause backfiring.
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post #12 of 18 (permalink) Old 03-07-2019, 09:51 AM
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At least one of the manuals out there has the firing order wrong. One coil fires front cylinders, 1-2 the other fires rear cylinders 3-4. With the wires on backward, the result is gunshot backfires.
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post #13 of 18 (permalink) Old 03-07-2019, 10:25 AM
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At first glance I would think it is not PG's but if you think about it a little more it very well could be. It seems when they PG's fail they have a variety of symptoms. The one thing that seems to be common is the on again off again spark to the plugs. The OP did not mention checking spark when it was not starting. I wonder if the bike is n't cranking with no spark for a while. Loading the mufflers up with air fuel mixture. At some point the spark decides it is going to start and that is your loud backfire. Maybe the "loading up" is not loading up but just weak or no spark causing misfire. I would give the entire ignition system a good look over paying extra attention to PG's and leaking secondary voltage from plug wires, coils etc. I'm wondering if you have intermittent spark some how.

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post #14 of 18 (permalink) Old 03-07-2019, 11:03 AM
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It's hard to troubleshoot when you get no feedback from the original poster. I pretty much rule out things like crossed plug wires or other mistakes because he didn't say it started after he did such and such. He also said he rode it home after it did the backfire thing and it was fine until the next day or so. To me, it sounds like the carbs are leaking and dumping raw gas into the cylinders. Cranking shoves that gas into the exhaust and the slow burning gas in the cylinders ignites the gas in the exhaust and there you have it. Just like redwing suggested. Does the 1200 have a vacuum operated petcock like the 1500? I'm gonna say his fuel is not shutting off.
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post #15 of 18 (permalink) Old 03-07-2019, 11:49 AM
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I just looked up his intro post, and there it sounded more like a PG problem.

https://www.goldwingfacts.com/forums...ml#post4842538

I agree, it would be nice if he'd let us know if he's even read any of this.

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post #16 of 18 (permalink) Old 03-08-2019, 11:37 AM
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When my GL1200 pulse generator problem presented itself, it was like a switch turned them off. I noticed a slight sputter as I hit the highway for the ride home from work (the bike always runs like a top so a slight sputter was very noticeable) and when I stopped for an accident that had to be cleared, I turned it off and then it would not fire at all when it was time to leave. My understanding is that if one goes, the other will not work either so no spark on either set and both have to be replaced. Can the PGs have intermittent problems as well?
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post #17 of 18 (permalink) Old 03-08-2019, 12:45 PM
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Originally Posted by Coyote Kid View Post
e. My understanding is that if one goes, the other will not work either so no spark on either set and both have to be replaced. Can the PGs have intermittent problems as well?
Sometimes they will run on 2 cylinders.

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post #18 of 18 (permalink) Old 03-08-2019, 01:44 PM
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Can the PGs have intermittent problems as well?
Yes. Sometimes they can work fine until the bike gets warm, then fail. Once cooled, they work fine again.

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