Bike runs for a bit then stalls and wont start for a while.

[Kevin142001]

So i've been riding my gs500 to work every day for a while. Never had any issues, idle was fine. Recently got into a wreck, just hit a curb going probably 20-30 mph, thats what i managed to slow down to before i hit it. Stupid story rider error. Bike flopped around. Mostly cosmetic damage as far as i could tell. Gas tank is dented on both sides handle bars are bent. Engine crank case cover has a big scrape. The bike had sat for about a month at a friends house until me and my friend got it in shape to ride back home. Rode it home which was about 20 miles away. Everything seemed fine.

Then it sits for another week and half with me just starting it once every two-three days and letting it burn gas for a few minutes. Then i go and take it for a test ride and go for a ride that ended up being about 6 miles. Hit a few red lights and a stop sign. All i notice right now, is that its idling low, its ilding like it hasnt warmed up even though it should be by this point. I get back into my neighbor hood pull in the clutch while coming up to a stop sign and it stalls.  Now it wont start. Prime resevior and on do nothing. Choke in any of these positions do nothing, pushing the bike in first gear does nothing. It just flat out wont start.

Engine turns over and over but no ignition. this was two streets from my house so i walked it home. That was yesterday, today i turned it on and it started immediately, I go for a ride only in the neighborhood, prob 2 miles or so and then it stalls again as im pulling up to my house and pulling in the clutch. Wont start.

Ive checked battery on a volt meter, 12.1, shouldn't start today anyways if it was too low yesterday. I dont think the bikes getting too hot? seems normal like it always has. Just checked my two fuel lines going into the petcock valve and both flow well. Just unhooked the petcock valve and tried the 3 positions. Fuel flows freely on prime, on on and res, nothing comes out but i can see vapors. Im assuming those two are vacumed into the carb when the engine is burning gas so it doesnt overflow.

The engine turning sounds completely normal, sounds like it always does. I feel like the carbs not getting enough gas or is clogged, or my sparks just stop working when hot, which i haven't heard of. Anyone have any recommendations what to look at next? im going to check for sparks to see if the plugs work when its not igniting. Its almost as if the carb is slowly filling with gas and it takes a while to refill once its burned up so i can start the bike once a day or something. Would appreciate any ideas or if anyone's had any similar problems.

Bikes a 2004 with 40k miles stock everything except for the muffler. Mufflers less constricting and there is slight exhaust leak where its been slipped on. Gas in tank is the same gas i had when it wrecked so its almost 2 monthes old. Oil is really cheap but its the right kind is full. Slight oil leak out the bottom pan, has been there before i crashed it. Doesnt seem any worse. Couple drops come out when pulling up to a stop.

[Kevin142001]

Got it to start again,  raised the idle, because the idle just sounded like it was dieing anyways. It sounds normal now, idles at 1300 or 1400, but still stalled after about a mile of riding. I can go into 2nd 3rd and 4th gear, doesn't have any problems throttle never feels weak really. When it does stall though, it does not want to go from neutral into first. A solid kick down and it stays in neutral most of the time. But it will shift up into second easily. When actually running but sitting still it shifts into first no problem, doesnt want to after stall.

so from the time it stalls, it will start running about 20-30 minutes afterwards. I dont visibly see any cracks or anything that could cause compression loss, but im not entirely sure what the symptoms are of that. Im still thinking its temp or fuel filling up slower than its being burned.


edited: Another updated, just got it to start again another 30 minutes later, this time i just let it sit and idle, got about 2-4 minutes. I noticed it only starts when its cool enough that i can put my hand on the case once its stalled. This could be completely unrelated to temp, but Heres what i know. It runs until its hot, then stalls, and it stalls all at once. Never any performance issues, no struggle for breath or struggle for gas. It just stops, the same as if i hit the kill switch. The loss of power is immediate and absolute. So far everything its stalled has been when coming up to a stop. This has been 4 times now. Could be coincidental, i haven't tried running it a straight line until it gave up, and honestly im not going to. My friends telling me to pull the carb and clean/look at it. I can't think of anything that would fail from heat. I can check all the bolts on the case, but i dont hear anything indicating pressure loss. And hes telling me if the plugs were going bad only when hot, i would have a performance loss before stall as one plug failed then the next. Will pull the carb soon, if nobody has any ideas that sound better. Can't think of anything that would cause sudden stall without struggling except loss of spark on both plugs at same time or compression loss? Also since me and my friend picked it up and rode it back, ive taken the front and side fairings off, from being bent and cracked from the crash. That ride there was no issues, i dont think that taking them off would affect anything. Ive only taken screws out and unhooked the front turn signals.

[Kevin142001]

So after more searching i find this post http://gstwins.com/gsboard/index.php?topic=46028.0

Now i am 100% certain i have the same problem. Today i haven't ohms tested every single electrical component but my problem is identical to his. Not a single symptom out of place. Today after having the bike stall, i checked my coils with a spark tester. And i checked my spark plugs while grounded to the engine. There is nothing coming out of them once the bike stalls. Looking at an electrical wiring diagram and reading this post leads me to believe its one of two things. My ignition control unit for whatever reason fails after 5 minutes of riding or more likely....

The crank trigger fails, given its a thin wire that heats up and loses its conductivity as it expands.  I think the crank trigger sends a signal to the ignition control unit telling it when to fire the spark plugs, and when the signal no longer comes the bike dies at a stop every single time. Both spark plugs once my bike stalls appear to be dead. And the engine turns and turns, sounds normal. No performance loss when the engine dies it literally dies as if someone hit a kill switch.

Am going to look into the process for replacing this and going to order the part online. Just wanted to give an update incase anyone has had similar problems or if its something anyone can learn from.

[TR]

It's really a long ago since you needed this answer, I know, but may be someone else could use it. A long ago, my GS is 17 years old, one magnet of the signal pickup got broken, the one below the scrapped engine cover if it fall on the right side, and the bike started to fail when hot... I had no availability of GS500 spares so I bought a cheap pickup for a 125cc and adapted to fit. It worked fine several months until I could get a new Signal Pickup Assembly.