About a month ago, my front brake stopped releasing and it wasn't until this past weekend that I got the chance to rebuild my caliper and master. So the bike sat for a month. Excited after the brake rebuild, I hopped on to go around the block to test my craftsmanship. The bike quit on me 4 times. It would run normal, with usual power, and suddenly shut off. Attempting to restart it, it would just turn over and over without catching. If I waited a few minutes, it would fire right back up at the touch of the start button. I would get a hundred yards or so and it would quit again. No sputtering or warning, it is as if someone hit the kill switch. Running lights, dash, headlight, tail light, all stay on, and naturally the oil light lights up when the engine quits. I figured it might be the battery... so I charged it over night. Yesterday, I decided I would take the bike to work. It rode perfectly for 2 miles, and at about 40mph it quit, but before I got a chance to pull in the clutch, bump started itself and kept going, but at the stop sign it died again. The starter didn't seem like it lacked power when it turned over either. I had to wait again for a few minutes, it started, and took me all the way to work (another 5 miles) where it quit as I was pulling into a parking spot and I could no longer restart it until a few hours later. Now it runs totally normal.
Before the bike sat, it ran completely fine. I finally got it up an running nice with freshly rebuilt and synced carbs. (It's an 550F but running 550K carb internals, with needles two notches up like an F which seems to work for my exhaust config) - 400 miles since that carb rebuild and recent sync. It got new plug caps, brand new non resistor plugs two weeks before it sat. I am running a brand new Dyna S installed less than a year ago with stock coils. New oil and filter (not that it likely pertains to this).
I did notice a few months ago that while in neutral, when I turn the key to the on position, once in a while there is a sound heard from the exhaust. Like a short burst of compressed air escaping .... a "PSSSST" to put in technically. While the bike wasn't starting yesterday, I heard that noise again after the engine rested for a few minutes and I turn the ignition on, and then a bit later after trying to start it, waiting, and turning the key to "on" the bike backfired like a gunshot. My dad, standing behind the bike, nearly s*& his pants! Not sure what could be causing this noise since nothing is moving internally??? Not sure if it has anything to do with this either.
Anyhow, I have still yet to check whether while the bike will not fire, whether I am actually getting a spark at the plugs (un)fortunately it runs right now, but for how long?
Any idea why it would just quit like that? Sounds electrical to me... tugging at wires while running didn't affect it. It's as if the bike hits its own kill switch just to take a rest. Dyna S failing?
Any ideas are appreciated.
Mike
(sorry for the long post... just wanted to give as much detail as possible)
