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April 24, 2019, 02:27:47 AM *
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Author Topic: Running on 3 cylinders  (Read 134 times)
Rexeriot
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« on: April 13, 2019, 01:35:23 PM »

Hi . Bike was running ok but now no 1 is out. Carbs have been stripped and are good. Compression is good  . Valves working like they should.  U have a spark . Plug was wet when I removed it . Its baffling me. Any ideas . Thanks
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a_morti
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« Reply #1 on: April 14, 2019, 04:22:28 AM »

Pull plug boot off, clean inside it with brake clean, remove plug and clean with brass brush and brake clean, cut away 1/4" of spark wire and put back together.
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Cam Drive Gear Train Smiley
See Bee-Won
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« Reply #2 on: April 19, 2019, 09:12:46 PM »

Many times a spark plug will spark out of the engine but not when installed and under compression.

 Other times you'll have a miss when you open the throttle to accelerate (high compression/low vacuum) but at idle and slow steady speed (low compression/high vacuum) it'll fire just fine.

 Like a_morti said clean the plug and boot real well to remove any hidden carbon tracks and your problem should go away. These bikes like to be run hard and the plugs are designed for that. If you do too much pokey stop and go traffic riding in town without taking her out in the open to let her sing once in a while the plugs will eventually carbon up and give you problems.
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