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Rough running 912UL

Matronics Email Lists Forum Index -> RotaxEngines-List

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sdemeyer

Joined: 31 Jul 2009
Posts: 45

Posted: Wed Dec 23, 2009 3:12 pm Post subject: Rough running 912UL

Hello Listers,



My 912UL, with 360 hours, has developed pretty severe miss between 2,500 RPM and 3,000 RPM. I've synced the carbs mechanically and pneumatically , cleaned the plugs and checked the ignition wiring but still have a miss. Number 4 cylinder top and bottom plugs were velvet black as was the top and bottom plugs on number one cylinder. 



If I run up the motor over 3,000 rpm then bring to down to 2500 or so, the miss goes away for about 5 or 10 seconds but then returns.



Any ideas?



Thanks,

Scott DeMeyer

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