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Valkyrie Riders Cruiser Club > General > 1500 Tech Board > Spiting and sputtering at higher rpms when warm
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Author Topic: Spiting and sputtering at higher rpms when warm  (Read 1297 times)
troy11533
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Posts: 9

Holts Summit, MO
« on: September 08, 2020, 09:01:46 AM »
So my bike has been spiting and sputtering at higher rpms when it’s been running at highway speeds for a couple of hours. It almost sounds like it’s starving for fuel but when I stop to get fuel for 10 minutes it’s fine then it does to same thing when ever it gets hot. NEED HELP!!!!!!!
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98valk
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Posts: 13449


South Jersey
« Reply #1 on: September 08, 2020, 10:50:55 AM »
oem petcock diaphragm might need replacement. it starts getting pinholes from wear movement.

or carbs are out of tune and adjustment.
« Last Edit: September 08, 2020, 01:52:24 PM by 98valk » Logged
1998 Std/Tourer, 2007 DR200SE, 1981 CB900C  10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp

"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
yrunvs
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Posts: 205


Prior Lake, Minnesota
« Reply #2 on: September 08, 2020, 01:28:01 PM »
Could it be a heat related electronic issue. I'm new to Valks and (if they have one) a regulator/rectifier would act that way if on its way out.
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I'm no gynecologist but hey I'll take a look!
pancho
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Posts: 2113


Bonanza Arkansas
« Reply #3 on: September 08, 2020, 03:19:45 PM »
Sounds like a classic case of the fuel tank vent being pinched. Open the cap with a spare key when it happens and see if that clears it up.
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The most expensive things you will purchase, are those things you would not have needed if you had listened and obeyed.
Jims99
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Posts: 804


Ormond Beach Fl.
« Reply #4 on: September 09, 2020, 05:00:54 AM »
Sounds like it’s starving for fuel. Like mentioned, vacuum line or petcock, vent line or external fuel filter. Gas isn’t flowing fast enough to keep up with fuel demand at higher speeds.
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99 tourer
00 interstate
97 standard
91 wing
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Jess from VA
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Posts: 30407


No VA
« Reply #5 on: September 09, 2020, 07:13:52 AM »
Quote from: pancho on September 08, 2020, 03:19:45 PM
Sounds like a classic case of the fuel tank vent being pinched. Open the cap with a spare key when it happens and see if that clears it up.

And put your head down there and listen for a sucking noise at opening of rubber seal.

In a pinch, you can close the cap on a zip tie (to add more venting).  But that's a temp fix.
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Edvalk
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Posts: 168

Dayton Ohio
« Reply #6 on: September 09, 2020, 03:33:11 PM »
My standard was doing the same thing . OEM petcock was the culprit. Installed a pingle and no problems since.
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1998 valkyrie standard , 2007 Suzuki Bandit 1250
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