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Petcock not flowing enough

  • Thread starter Thread starter Junkie
  • Start date Start date
I had a similar problem with an '82 GS850. It would starve & die on level pavement at 60 m.p.h. I'd have to stop somewhere and let the bike sit on its sidestand for a few minutes, and I'd be good for another few miles. It really sucked. This would occur on either 'ON' or 'PRIME'.

I pulled it apart and didn't see any problem with the inlet screen, but since it was trashcan-bound anyway, I just gutted the screen and tried it like that.

That solved the problem.
 
Nessism said:
I still say measure the fuel flow if you have not ordered a new petcock already. Get a glass jar and put the fuel line in it. Turn the petcock to Prime and time how long it takes to fill. This is your baseline since you state the bike runs fine on Prime. Next, do the same test with the petcock on ON and RES, you will need to draw a vacuum on the vacuum line input to the petcock. If the petcock flows the same amount of fuel in both situations, it's fine.

A couple of things worth looking at are the screen filters in each carb at the fuel inlet, and make sure the fuel line does not loop upward as it leaves the petcock and flows into the carbs. Both will create restrictions in the line which will reduce fuel flow.

Good luck.
Click to expand...
It does loop up a small amount, it would be very difficult to not have it do so at all. No filter though, and it should siphon fine - the amount of restriction present in the line is small enough that I would be very surprised about it causing any problems, and all that should really matter (once you get the line full) is the length of the line.
 
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