Rotax912ul sputters when reducing throttle

by jan kerstens in 912 / 914 Technical Questions 10 years ago

Hello,
After installing the new fuel pump my Rotax sputters now and then when reducing the throttle.
What could be the remedy?
Best regards Jan Kerstens

Re: Rotax912ul sputters when reducing throttle

by Roger Lee » 10 years ago

Roger Lee

126 5.13k 4.56k

Is it actually a sputter like a fuel issue or just a rough spot in the rpm when throttling back?

It's possible you have a leaky needle valve? How's the carb sync?

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

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Re: Rotax912ul sputters when reducing throttle

by jan kerstens » 10 years ago

jan kerstens

34 131 5

Hi Roger,

Carb synch OK. No rough spot on RPM: no vibrations. When I increase the throttle when the sputter occurs it will immediately disappears. Need for concern?

Greetings Jan

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Re: Rotax912ul sputters when reducing throttle

by jan kerstens » 10 years ago

jan kerstens

34 131 5

Hi Roger,

Reflected on what you said: leaky needle valve: I assume you mean that the float needle is not properly closing off. If so what is the remedy?

Greetings Jan

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Re: Rotax912ul sputters when reducing throttle

by Roger Lee » 10 years ago

Roger Lee

126 5.13k 4.56k

That's the one. Adjusting the float arm level or Replacement.

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

Thank you said by: YEN NIEN YU

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Rotax912ul sputters when reducing throttle

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