fuel leaking into exhaust and motor

[toobluemusicman]

I have a 1981 Gs 750. Iam the second owner of the bike. And it only has 9800 miles on it. I left the fuel petcock on and it filled up the exhaust with fuel, and into the motor oil. Is this normal? I started replacing all the fuel lines. Do need to rebuild the petcock also? Help would be greatly appreciated. thanks Jon

[kparkfan]

does your petcock have just the on and of positions? , or does it have the prime on and reserve positions? ive read alot on here that rebuilding the petcock is just a waste of time. better to just buy a new one and it will last for many years.also might want to check that the float needles arent sticking. how long has the bike sat cause a good carb clean might be in order.

[slip]

I would say that you probably need to rebuild it. I would also dump your oil and put fresh oil in. I wouldn't run the motor with that contaminated oil in it.

[chef1366]

Get new petcock. I would also clean the carbs and check for rust in the tank.

http://www.thegsresources.com/gs_carbrebuild.htm

[toobluemusicman]

I have the petcock with 3 postions on it. where do i find a new petcock? the bike also has uni air filter without the air box.And has 4 into 1 kerker exhaust. I have cleaned the carbs. And cant remember where the fuel lines go.

[SqDancerLynn1]

CHeck with www.z1enterprises.com for new petcock. You can get a replacement for about $45-50 or OEM for around $76 rebuild kits are $30 Yiour choice. You should clean the carbs and replace the float needle seat O rings too..
Have the carbs been rejetted ?

[cyclefvr2]

pet cock wont help if its the float needle's leaking

[ryder60]

I would say that you probably need to rebuild it. I would also dump your oil and put fresh oil in. I wouldn't run the motor with that contaminated oil in it.
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Do this and set the floats. Then you'll know whether you have to rebuild the carbs.

[Larry D]

I have a 1981 Gs 750. Iam the second owner of the bike. And it only has 9800 miles on it. I left the fuel petcock on and it filled up the exhaust with fuel, and into the motor oil. Is this normal? I started replacing all the fuel lines. Do need to rebuild the petcock also? Help would be greatly appreciated. thanks Jon

No. It's not normal.........Do not start the bike with fuel in your engine. Drain it completely, get a new oil filter and rubber o-ring for the cover. Your going to need to change the oil and filter, run the bike a 100 miles or so and change it all again. Don't fool around with the oiling system on this particular model engine !! As long as you take good care of it, it will run forever, if it's abused.......well, I won't answer that.

The petcock has failed if it was in the "ON" postion. Fuel should not flow because the fuel is vacumn fed in this position. In the "PRI" position the petcock releases the vacumn and the fuel is gravity fed. I'm guessing your petcock is original, it's old !! The rubber inside has likely deteriorated. Get a new and don't worry about it for another 20 years.

Also follow the link provided by Chef and rebuild the carbs. Which will include all new rubber o-rings for them as well.