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Valkyrie Riders Cruiser Club > General > 1500 Tech Board > bad back fire
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Author Topic: bad back fire  (Read 1392 times)
beamerwelder
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Posts: 6
« on: September 30, 2011, 04:26:34 PM »
i have a bad back-fire from 1200 to 3500 rpms. #6 cyclinder is the culprit- it has compression, been desmoged, carbs cleaned, plug firing. any suggestions.
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John U.
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Posts: 1085


Southern Delaware
« Reply #1 on: September 30, 2011, 05:18:20 PM »
The plug may fire at idle when you check it but under load it can still miss.
How did you determine that #6 is the problem? If you are sure it's #6 try changing that plug and see; since they're not expensive you may be wise to replace them all.
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YoungPUP
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Posts: 1938


Valparaiso, In
« Reply #2 on: September 30, 2011, 06:24:24 PM »
Check the vacuum line for the petcock, it should be connected to the #6 intake, the hoses like to split at the ends and leak. May try moving the coil pack for that cylinder set and see if the backfire moves with it.
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Yea though I ride through the valley of the Shadow of Death I shall fear no evil. For I ride the Baddest Mother F$#^er In that valley!

99 STD (Under construction)
electdroid
Member
*****
Posts: 2
« Reply #3 on: October 02, 2011, 04:53:26 PM »
My Valk started to backfire on overrun (closed throttle from higher revs).  It was from water in the gas--I cured it with about 1/2 cup of methyl hydrate (gas line anti-freeze) in the tank.
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Farther
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Posts: 1680


Quimper Peninsula, WA
« Reply #4 on: October 02, 2011, 07:21:05 PM »
It has been a long time since I've heard methyl hydrate used for methyl alcohol.
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Thanks,
~Farther
beamerwelder
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Posts: 6
« Reply #5 on: October 04, 2011, 03:40:32 PM »
the problem was a weak coil. fired at low speed on the bad side but at 2500 rpms it quit firing. thanks for the help.
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