99 GL1500 Hesitates to keep up at 85mph+ - Steve Saunders Goldwing Forums

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post #1 of 11 (permalink) Old 03-24-2019, 09:38 PM Thread Starter
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99 GL1500 Hesitates to keep up at 85mph+

Hello folks, this bike is kinda new to me, well i've had it for 3 years but only used it around town until 6 months ago since i got her new tires and front fork tubes.

I've installed a new fuel filter and air filter and ran a can of seafoam.

When going past 85mph it wont keep that speed for longer than a minute or two and it will start stuttering and slowing down, i've already tried opening the gas cap but it wont cure it.
below that speed it runs really nice, strong and smooth i can cruise at the max cruise control speed with no problems (around 80mph)

Any idea what can it be? Where should i start??
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post #2 of 11 (permalink) Old 03-24-2019, 10:06 PM
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Sure sounds like lack of enough fuel. May be the vacuum petcock has a small leak and with the vacuum low at high speed it just can't stay open.

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post #3 of 11 (permalink) Old 03-24-2019, 10:09 PM Thread Starter
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oh, i've rebuilt the vacum petcock too.
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post #4 of 11 (permalink) Old 03-24-2019, 10:14 PM
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oh, i've rebuilt the vacum petcock too.
How about a vacuum leak in the line going to it? Try bypassing the petcock.

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post #5 of 11 (permalink) Old 03-24-2019, 10:27 PM
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Or maybe a fuel pump that is starting to die...

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post #6 of 11 (permalink) Old 03-25-2019, 12:22 AM
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Sounds very typical of a failing fuel pump that only pumps enough fuel for 84 MPH.
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post #7 of 11 (permalink) Old 03-25-2019, 12:35 AM
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Quote:
Originally Posted by redwing52 View Post
Sounds very typical of a failing fuel pump that only pumps enough fuel for 84 MPH.

this is my suggestion and exactly what I had to do to fix the same problem on my '98SE a few years back.


with my bike, it was a bit worse... it would run for about 2 miles and suddenly 25 mph was the best it could do. stop and let it idle and it would make another mile at 35ish....


I was 11 miles from home when it suddenly decided to go into fail mode like this..... and I replaced it with the NAPA/Carter fuel pump.


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post #8 of 11 (permalink) Old 03-25-2019, 02:08 AM
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My '98 suffered that too at 85mph and it was a vacuum leak to the petcock.

GL1800A 2006
Previously:
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Harley Fatboy 2004
Triumph Rocket Touring 2010
Honda Valkyrie 2002 (fantastic!)
Pan European ST1100
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post #9 of 11 (permalink) Old 03-25-2019, 05:44 AM
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It couldn't be the Flux Capacitor - He never made it to 88 MPH....

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post #10 of 11 (permalink) Old 03-25-2019, 10:31 AM
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Try Bypassing the Fuel Petcock... If the speed problem goes away, then you've found the culprit.


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