GS500F stalls out while riding

shearer500 · May 28, 2013, 05:43:31 PM

I was riding my GS yesterday and I got about 2 miles from my house and it suddenly had a big loss of power and was bogging down. About 100 yards later the engine stalled. I started to check things like make sure I turned the fuel petcock on and made sure there was gas in the tank. Everything looked O.K. so I started the bike back up and it ran fine for about another half a mile and it died again. this time it wouldn't restart. I had to leave the bike, walk home, get the truck and bring the bike back home. The next morning I tried to start it again. It fired right up and I let it warm up in the driveway. When I took it for a spin it didn't even make it to the end of the block before The engine quit again and I had to push it back home. Any ideas?
Thanks,
Randy

Paulcet · May 28, 2013, 05:59:08 PM

Try with petcock on Prime.

Snake2715 · May 28, 2013, 07:24:11 PM

gas cap vent plugged, or pinched?

What have you done to the bike, how long have you had it?

Xevamir · May 30, 2013, 03:09:32 PM

Bump. I'm having the same problem with my bike. Does anyone have a solution?

shearer500 · May 30, 2013, 03:30:40 PM

I have put a slip on exhaust and air filter on the bike and jetted accordingly. How do I check the vent on the gas cap?

shearer500 · May 30, 2013, 03:37:21 PM

It has been several months since the exhaust/filter/jets and it was running great that whole time.

Xevamir · May 30, 2013, 05:03:20 PM

We've gone through a lot of things so far, and we still can't find the problem...

Kerry · May 30, 2013, 05:20:58 PM

Quote from: shearer500 on May 30, 2013, 03:30:40 PM
I have put a slip on exhaust and air filter on the bike and jetted accordingly. How do I check the vent on the gas cap?

Did you happen to turn off the under-tank petcock as part of this process?

PatheticPuma · May 30, 2013, 06:05:42 PM

Quote from: shearer500 on May 30, 2013, 03:30:40 PM
I have put a slip on exhaust and air filter on the bike and jetted accordingly. How do I check the vent on the gas cap?

http://gstwins.com/gsboard/index.php?topic=41061.0

Xevamir · May 30, 2013, 07:48:32 PM

Quote from: PatheticPuma on May 30, 2013, 06:05:42 PM
Quote from: shearer500 on May 30, 2013, 03:30:40 PM
I have put a slip on exhaust and air filter on the bike and jetted accordingly. How do I check the vent on the gas cap?

http://gstwins.com/gsboard/index.php?topic=41061.0

Did that work for the issue that the OP is describing?

shearer500 · June 02, 2013, 10:07:51 AM

I ran the bike with the petcock on prime and it ran great. What is wrong with it that it will only run on prime?

jmill · June 02, 2013, 10:34:52 AM

Maybe a problem with the vacuum system? ON and RES are vacuum actuated; they close the petcock when the bike is off. PRI lets fuel flow regardless of vacuum so that you can prime the carbs after everything's been drained.

Snake2715 · June 02, 2013, 06:04:05 PM

Quote from: shearer500 on June 02, 2013, 10:07:51 AM
I ran the bike with the petcock on prime and it ran great. What is wrong with it that it will only run on prime?

Did you ever separate the two carbs?

THe left carb has a vent tube coming out the top right and it goes to the back of the petcock.. its a vacuum hose. Maybe it slopped off, got pinched, cracked, etc.

lynx124 · June 03, 2013, 07:12:01 PM

Hey im having the same exact problem and described it in a different thread...still working on a solution, but maybe some of the activity on the thread i started may help...heres the link...

http://gstwins.com/gsboard/index.php?topic=64485.0

best of luck!

Nahian · June 03, 2013, 08:28:31 PM

If it ran fine for months then its prob just not getting fuel due to some vacuum prob, somethings pinched, etc. The frame petcock/tank petcock may need to be checked. I got rid of my frame petcock all together to rid myself of fuel issues like this with a t connector going straight from the tank to the carbs.

frylockjim · June 03, 2013, 10:48:34 PM

i would also check the main jets if your shutting down while on the road. You never know if something just magically appears in the float bowls and cloggs up the jets. Just happened to me this morning and i found the culprit in my left carb. Same symptoms that you are having btw and i got her running

shearer500 · June 09, 2013, 07:03:55 PM

The hose at the bottom of the airbox was disconnected. It appears to just be a drain hose but could this be my problem?

frylockjim · June 09, 2013, 10:18:44 PM

Quote from: shearer500 on June 09, 2013, 07:03:55 PM
The hose at the bottom of the airbox was disconnected. It appears to just be a drain hose but could this be my problem?

it could cause unfiltered air to go into the intake, which could be bad. i would reconnect or block the line if possible. I dont think that would cause it to stall out though. I would check the fuel lines, carburetor, and vacuum lines for any abnormalities, cause it sounds like it could be fuel starvation. Can you post a link to a video of your bike and how its sounding when it stalls out?

jacob92icu · June 09, 2013, 10:21:41 PM

Could also be the voltage regulator gone bad if you checked everything on the carbs. Battery will have some juice to start but then will die from not being charged while running. Bike just running on battery power = no good. Except this sounds more like a fuel issue, just throwing it out there.

adidasguy · June 09, 2013, 10:38:52 PM

Drain hose on the sir box has a one-way cap on the end. You should replace it with the correct thing.

Fuel starvation can be due to a dirty petcock. Jacob told us at the West Seattle Bike Cave that he had fuel problems. Then he opened up the frame petcock and cleaned out a lot of gunk and crap. After that, the frame petcock was good as new.

Interesting that people just don;t think of cleaning out that thing. I've also opened up a few and found them full of crap. Gas sitting in there will form sludge - just like anywhere else. Just as fuel lines and carbs need occasional cleaning, so does the frame petcock.

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GS500F stalls out while riding