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Not sure if this is why my bike runs like crap or not but maybe someone else knows

  • Thread starter Thread starter Gsbobmaster1
  • Start date Start date
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Gsbobmaster1

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I have an 1981 gs750. On top of the motor is I believe the timing cover. It is a rectangle peace and it has a rubber hose on the back of it. For some reason it is leaking fuel out of this hose I am supper confused it is no where near the carbs I don't even know how fuel could get up there.
 
Not a good sign. How is your oil level? Sometimes fuel spillage from the carbs and/or the petcock can flow down into the engine and dilute the oil. If your oil looks over filled this may be the problem. In those instances you need to change the oil and filter with fresh, and fix the problem. I'd check the petcock first since that's an easier fix than tearing into the carbs.

Good luck
 
How much oil is in your crank case? Is it way over the sight glass?
A leaking petcock will fill your crankcase with fuel, when it's full it could come out the breather, which is what that cover with the hose is.
 
When I got my 1980 GS750E the same thing happened, the petcock leak filled my block up with gas. Do not try to start the bike, if there is gas in it you can burn up the bearings, and then you have a REAL BIG Issue. Open the filler plug and smell for gas, you may also see it filled that high. If so, then open the filler plug, then drain the oil and leave the oil plug off, remove the oil filter and level that open also. Let it all evaporate and dry out for a couple of days. Do not WASTE your time with a petcock rebuild kit, buy a GOOD NEW one from Suzuki or K&L, do NOT get NOS (new old stock) the diaphragm inside will be dry rotted and you will be in the same boat again soon.. when you got all the done, fill the bike with new oil and a new filter and run it, maybe get a few miles on it, and then change it all again. Rob
 
The piece that you are talking about is the breather cover and vent hose for the crank case. It sits on top of the valve cover.

Does the fluid coming out the breather smell like GAS?
If so...refer to the above three posts as your petcock is shot.

If NOT... you will have to remove the breather cover and check for the screen/mesh that is supposed to be tucked into the valve cover below the breather cap. Usually, you'll need a new breather cover gasket as the old one will likely tear and shred when you pull the cover.

As to how the bike is running, what maintenance have you done to it, so far?
 
Dave8338 said:
The piece that you are talking about is the breather cover and vent hose for the crank case. It sits on top of the valve cover.

Does the fluid coming out the breather smell like GAS?
If so...refer to the above three posts as your petcock is shot.

If NOT... you will have to remove the breather cover and check for the screen/mesh that is supposed to be tucked into the valve cover below the breather cap. Usually, you'll need a new breather cover gasket as the old one will likely tear and shred when you pull the cover.

As to how the bike is running, what maintenance have you done to it, so far?
Click to expand...

Your taking about this peice here, right>?? If so, there is really no way for the Gas to get in there, unless the block is flooded with fuel and oil. Rob
 
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It smells like gas. And is smoking badly from the fuel flowing out of the vent onto the motor. there is no fuel in the oil though. I just paid a guy 300 dollers to go through the carbs and put new jets because I have k&n pods on it and aftermarket exhaust. And synchronize the carbs. He also replaced the orings and diaphragms while he was in there one was ripped
 
Gsbobmaster1 said:
I have pods on it no air box.
Click to expand...

WELL THERE YOU GO.... you are going to need to put a breaker on it, I think K&N sells one, but you may have to rig on to fit it.

when was the last time you change the oil and filiter>???
 
Breaker? What is that. And the oil needs to be changed it has about 3500 miles on it.
 
Oh I got you now yah I was just looking at one of those on z1. Is this a common occurrence do you know? Is that just excess oil and or why does it smell like fuel. If the oil don't smell like fuel, but the stuff coming out of the vent does what is that all about?
 
K&n and no for some reason I did not get an breather filter didn't know they were supposed to come with one?
 
Gsbobmaster1 said:
It smells like gas. And is smoking badly from the fuel flowing out of the vent onto the motor. there is no fuel in the oil though. I just paid a guy 300 dollers to go through the carbs and put new jets because I have k&n pods on it and aftermarket exhaust. And synchronize the carbs. He also replaced the orings and diaphragms while he was in there one was ripped
Click to expand...

Go get your $300 back, obviously it's not right. DO NOT trust some guy to work on your bike, who knows what he has done. Gas should never be coming out of the top of the engine.
If, in fact, it is gas, DO NOT start the engine. The 2nd generation 750 have oiling problems anyway and if you run it with gas mixed in bad, bad things will happen. As said earlier it's more than likely the petcock.:)
 
Gsbobmaster1 said:
Oh I got you now yah I was just looking at one of those on z1. Is this a common occurrence do you know? Is that just excess oil and or why does it smell like fuel. If the oil don't smell like fuel, but the stuff coming out of the vent does what is that all about?
Click to expand...

LOL.. not sure, but I know when mine is OFF, it smokes like a B-tch..LOL...and yes, smells like gas.. you have to rememember these are 30 year old bikes, and things are not as tight as they once were. I would say, change your oil and clean or change your plugs to start....
 
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