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912UL not Starting

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ppeerenbo(at)charter.net
Guest

Posted: Mon May 28, 2007 11:56 am Post subject: 912UL not Starting

Need some help with a 912UL 300TT not starting  after being off for a year.

 Have fuel at the  carbs cleaned and new  diaphragms installed. I can put my hand over the carb inlets and turn it over  and get lots of fuel.  Getting very weak spark and has only fired once or  twice in hours of testing. Eng turning over well (have jumped it ) I am looking  if anyone knows what the voltage outputs from the CDI boxes to the ignition  coils should be? I have 8 volts wile cranking at the red generator ignition  circuit cables circuit to ground ( both the same ) I get about 12 to 13 volts to  the coils is this correct or too low? I have the old style interference box but  new style plugs. ( I replace them for something ) 

  

 Paul Peerenboom

 Kitfox IV  912UL  300TT

    [quote][b]

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jwdfly

Joined: 26 Apr 2007
Posts: 4

Posted: Mon May 28, 2007 3:19 pm Post subject: 912UL not Starting

Check your valve clearance, Do not know much about  912's ,but do know about four strokes.

 [quote]   ---

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Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon May 28, 2007 4:59 pm Post subject: Re: 912UL not Starting

Hi Paul,



First thing is try it with a new battery. The 912 must turn the prop at least 225 rpm for it to turn turn over. It may sound ok to you, but may be under the 225 rpm. Did you pull the main and idle jets and physically clean them? If you need to test the prop rpm you can use a jumper cable and a car battery. This will give you the cranking power to test the prop rpm. Use of the choke lever only adds more fuel and is not a true choke. Do not add throttle when choking the engine. That being said I have had to just barely crack the throttle on a few to get them started. I said only crack the throttle. Let me know how the next starting attempt turns out.



You can go online under Rotax or Kodiak and go under tech info and print out the line main and the heavy maint manuals. they will tell you how to test electrical components and what their values are.

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Mon Jun 04, 2007 6:35 am Post subject: Re: 912UL not Starting

Did you find your problem?

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

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