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Need help with gs 850 fuel system

  • Thread starter Thread starter Guest
  • Start date Start date
jdvorchak said:
Even after running for just a few seconds the exhaust pipe will have sufficient heat to cause 1st degree burns.
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That also depends on whether you have stock or aftermarket pipes. :-k

Stock pipes are double-walled, which takes a bit longer before they get warm enough to burn you. Aftermarket pipes are single-walled, so yes, they will burn you much quicker.

If we want to subscribe to the nanny theory, we would certainly not advocate doing anything as dangerous as trying to touch an exhaust system. In fact, we would probably not even advocate riding a motorcycle. :oops: However, most of us have an IQ of sufficient level that allows us to stand vertically and breathe at the same time. I think most of us would not GRAB the pipes, but touch them ever so briefly. Yes, it's a bit of an acquired technique, but right after startup, there is very little chance of bodily damage.

.
 
Yeah an ice cube would be easy. Burned my leg slightly on the pipe but not bad. It does bog down when I give it gas but then revs up making it dangerous for a newish rider(me) there is no in between. I will check the cylinders.
 
Machinegunner said:
Yeah an ice cube would be easy. Burned my leg slightly on the pipe but not bad. It does bog down when I give it gas but then revs up making it dangerous for a newish rider(me) there is no in between. I will check the cylinders.
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Oh no!! The dreaded "Chase the air leak" I think. If it bogs and then you give it a bit of twist and she revs high and wont come down ?may? indicate an air leak.

So like I suggested about the gas applies here again. Go to the furthest point of air .. your air filter box and systematically going forward to the engine check every connection and every bit of rubber. For me getting the airbox and carbs lined up well enough to hold air before I got new boots was a bear.

Have you tried to take it out yet? The very very first time I got my bike started it did the same thing. I took it for a short trip and it settled in. I still had 4 months of hunting and peaking to get everything right but perhaps after its first cleaning and having sat things were stiff. You will likely have more work to do but depending on how high she is revving you should give it a spin even if it means modulating the clutch a bunch so you can get a better indication of where she stands.
 
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It?s probably the boots between the air box and carbs. I had a heck of a time getting them on and they might not be properly fitted. I?ve ridden it about a quarter mile ( up and down the driveway )
 
So I started it up and rode it a little to warm it up so I could test for a dead cylinder. After a few minutes it stopped sounding bad and the next thing I know my leg is soaked with gas. Carb 3 was leaking. I assume that the gasket is bad and the float was stuck so as soon as it broke free it leaked gas? I ordered another gasket and took the carburetor off a third time. 😑 also looked at the air box and there was a mouse nest so I cleaned that out. It must have been running rich because on checking the spark plugs again they were black. So hopefully I found everything. Once I get it going good I will need help on the charging system. The previous owner had told me it wasn?t working. I?ll ask about that in the correct forum.
 
The fuel level should never get up to the float bowl gasket level. So if it's leaking from that gasket that means either the flow is set too high, allowing too much fuel into the bowl, or the float valve or seat is leaking.

I don't remember if these are CV BS3x carbs or VM smooth bores? If the CV Mikuni carbs the float seats come out and there is an O-ring that must be replaced or it will leak like a sieve.
 
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