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(snipped) I pulled the timing sensor and cleaned a quantity of metal shavings off it. (snipped)
I'm not familiar with the machine at all. But this would really concern me. What am I missing here?
I say go through the connections, especially grounds for the ECU and coils. I doubt very much you have a carb blockage.
In case it might be the fuel petcock screen was covered with some sort of gunk I ran with the other side. That seemed to work for awhile, then the condition came back with gusto. Sometimes when running at steady speed the engine begins to run poorly, almost as though running out of gas and running on one cylinder. Rolling the throttle open stops that, then it begins to cut out and come back on with a backfire.
Swarf, kinda normal.. shavings from the ring gear.
At first mention of this situation it seemed it was possibly only one cylinder but now it's obvious both are quitting. It's just the same as flicking the emergency stop switch for half a second, including the loud backfire.
At first mention of this situation it seemed it was possibly only one cylinder but now it's obvious both are quitting. It's just the same as flicking the emergency stop switch for half a second, including the loud backfire.I'll take time this weekend to remove the tank and more carefully examine the wiring. I only checked the parts mentioned in the first post, thinking that would clear the electrics. The gas tank was nearly emptied and refilled yesterday, so I'll not drain it until satisfied with the electrics. By then it ought to be about empty again!
I'm getting that this is a carbbed bike with an electronic ignition that uses a position sensor. If I'm wrong, tell me -- I can take it.I'm thinking that there's a problem with the transition from idle to intermediate jets -- a lean gap between the two. In a car this gap is filled by the accelerator pump. which dumps raw fuel in the airstream to compensate for the sudden inrush of dry air. Some guzzi carbs also have accel pumps. If yours does, I'd check the function. I'd also clean out the jets. They may look 'clean', that is, uniformly round as you peer through the jet bore, but they can have a buildup of 'plaque' on the bore surface that effectively changes the aperture size. So judicious use of a jet drill would be in order.Again, if this doesn't apply, nevermind. I have a wiring harness to build.
Most likely cause is a failing coil. I've had the same issue before, if you listen carefully you can tell which side is backfiring. In high school, I'd drop my 65 Buick into low at about 30 mph, turn the key off and then back on and BOOM. It was great until I blew the muffler off. I posted about my coil failure last summer.http://wildguzzi.com/forum/index.php?topic=71621.msg1113631#msg1113631