Rough running engine - 912 100 hp

by Tony Garrett in 912 / 914 Technical Questions 10 years ago

My 912 has run smooth for 600 hours Yesterday on start-up it ran very rough for about one minute then ran fine - engine almost came out of the engine mounts.
Mags checked good
Compression checked good
Carb syn good
Spark plugs look good
Spark plug gaps good

Any suggestions?

Re: Rough running engine - 912 100 hp

by Roger Lee » 10 years ago

Roger Lee

131 5.38k 5.44k

Hi Tony,

You may have had a piece of debris in the carbs that has either shifted out of the way or it went through. You may want to pull the carb bowls and or idle jet for a look.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Rough running engine - 912 100 hp

by Rhett Mitchell » 10 years ago

Rhett Mitchell

8 99 0

Could water in the system somewhere do that?

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Re: Rough running engine - 912 100 hp

by Roger Lee » 10 years ago

Roger Lee

131 5.38k 5.44k

Yes it could. Have you looked for signs of water in the carb bowls?

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Rough running engine - 912 100 hp

by MARK JACKSON » 10 years ago

MARK JACKSON

12 332 11

Hi Tony

Is it possible your throttle cable jumped out of the adjusting nipple on the carb for a moment.

It is fairly common if the cable is not secured.

Also check your carb rubbers. If they haven't been changed already, they could be split.

Mark

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