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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???.
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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?Cowboy Up or Quit. - Run Free Lou and Rest in Peace
1981 GS550T - My First
1981 GS550L - My Eldest Daughter's - Now Sold
2007 GSF1250SA Bandit - My touring bike
Sit tall in the saddle Hold your head up high
Keep your eyes fixed where the trail meets the sky and live like you ain't afraid to die
and don't be scared, just enjoy your ride - Chris Ledoux, "The Ride" -
"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.
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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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 stopsComment
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