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Fuel problem

  • Thread starter Thread starter rotty
  • Start date Start date
R

rotty

Guest
I have a 84 gs750..New rings and hone.. head rebuilt.. 34 mikuni with a big bore kit..Having problems with fuel..I broke the motor in and it was all fine.Went out a few times no problems..Seem to have problem with fuel flow..When i put it on prime off the carbs it runs fine..When i have the fuel line on the carbs it won`t flow.I take the hose off a little to let air out(i think) it flows again..Then after a few minutes it stops working again.I took the cap off my tank and nothing changes.My bike ran a little hotter today..One time it stopped i was at 114c and the other time 127c..Well if the vapor gauge is right.I went out tonight and it ran around 101 and no problems.Am i getting a vapor lock or something through the carbs..Any ideas and help would be great..It seems the bike is running a little hot???.
 
Prime allows the fuel to flow without restriction into the carbs while it won't flow on "on" or "reserve" without a vacuum. Have you tested the petcock by applying suction on the vacuum line to ensure it is working correctly?
 
"Vapor lock" happens when the fuel pump does not have liquid fuel to pump.

Since our "fuel pump" is gravity, it's kind of hard to have vapor lock.
shrug2.gif


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I know that prime does that..It does work when i don`t have the fuel line on the carbs..When its on prime hooked to the carbs it won`t flow?.I ordered a new petcock and i am picking it up friday.Do you think it's a petcock problem or vapor lock?.It seems the prime works when the bike is cold but when it heats up a little it stops
 
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