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krazydoc33(at)gmail.com
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 Posted: Tue Dec 10, 2013 2:15 pm Post subject: Running rich |
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I have a 912 ULS in a RV-12. It has run rich from day one. Another flyer on the field had a similar problem and he raised both needles one notch, leaner mixture, which cured his problem.
I decided to give that a try, as well as running rich, the EGT were around 1230. The left carb. needle was set at the second notch down and I moved that to the third notch. The right carb. was already at the third notch! I moved that one down to the fourth notch. I have not started it yet as today was too cold and wanted to see if there were any comments first. It seems odd that the two needles would be in different positions as this was an engine directly from the factory. The plugs on both sides looked the same, a fairly light coating of black soot that was easy to remove but below that was black color on the ceramic that was very hard to remove. Fuel consumption has not been high, right around 5 gals./hour.
Henry
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Dec 11, 2013 4:57 am Post subject: Re: Running rich |
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Hi Henry,
Your right that the factory needle clip position is the 3 notch down from the top. Moving the clip to the bottom or fourth notch will richen it. Moving it up to the 2nd from the top will lean it. I allows the needle to sit down further into the main jet. Cold dry OAT's help lean your mixture. Don't take black dry sooty plugs as being too rich if you have been idling. That is normal many times. Once the engine is run up to let's say 4K rpm and run for a few minutes that goes away. Pay more attention to EGT's and what plugs look like if you shut down from higher rpms.
The leaner clip position from factory will be the 2nd notch from the top.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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