Engine will not go above 3500 rpm

by Wilhelm Harder in 912 / 914 Technical Questions 7 years ago

Hi
Our 914 UL suddenly won't go above 3500 rpm. It's starts nice and runs smooth up to there and starts running rough and won't go above that.
I would appreciate your ideas or help
Will

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Re: Engine will not go above 3500 rpm

by Rob Seaton » 7 years ago

Rob Seaton

3 1.32k 251

you probably have a leak at the float bowl gasket.
as soon as you get boost the pressure can escape from the gasket leak and the engine runs too lean.

Thank you said by: Wilhelm Harder

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Re: Engine will not go above 3500 rpm

by Wilhelm Harder » 7 years ago

Wilhelm Harder

1 2 0

We have checked and ran the engine but no change. No visible leaks anywhere. Fuel flow drops a bit just as it starts to run rough at 3500 rpm and the increases suddenly lot without an increase in rpm.

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Re: Engine will not go above 3500 rpm

by Rob Seaton » 7 years ago

Rob Seaton

3 1.32k 251

you will not see any leaks or stains as the fuel is comes out as a vapor (unless you use avgas as it has a lot of blue dye)
check if the float bowl sealing surface is even (check with a "straightedge". If the bowl plug has been over-torqued the bowl will be distorted and you will not be able to seal it.

Thank you said by: Wilhelm Harder, Ken Ryan, David HEAL

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Re: Engine will not go above 3500 rpm

by Wilhelm Harder » 7 years ago

Wilhelm Harder

1 2 0

Thank you! That was helpful. Engine is running smooth

Thank you said by: RotaxOwner Admin

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Re: Engine will not go above 3500 rpm

by Roger Lee » 7 years ago

Roger Lee

128 5.28k 4.98k

Hi Rob,
Nice catch. :)

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

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Engine will not go above 3500 rpm

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