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  #1  
Old 05-01-2010, 06:20 PM
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Join Date: Feb 2010
Last Online: 08-21-2012 01:37 PM
Location: Ohio
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Question Please Help With My Electrical Issue

     

I have finally diagnosed the backfiring and missing problem on my 1987 YZ125 to the electrical system. The bike idles fine, but at medium revs it starts backfiring and missing. Where do I start first? Should I pull the flywheel and check the timing plate? What component failure can cause this?

Any help is appreciated
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Old 05-01-2010, 11:38 PM
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Put a new plug in NGK and gap per manual. If that doesn't do it Pull cover and make sure flywheel is tight. Then line up marks on plate with magneto.But to me it sounds like jetting
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Old 05-02-2010, 04:24 PM
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I installed a new NGK plug, with no luck. I cleaned the carb, and I have not changed the jetting. The electrical system is fine. I figured out last night that the powervalve arm does not move. So I suppose that is the problem? What can cause it to stop working?
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