Rotax912ul sputters when reducing throttle

by jan kerstens in 912 / 914 Technical Questions 11 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 » 11 years ago

Roger Lee

128 5.28k 4.98k

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

Report
Re: Rotax912ul sputters when reducing throttle

by jan kerstens » 11 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

Report
Re: Rotax912ul sputters when reducing throttle

by jan kerstens » 11 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

Report
Re: Rotax912ul sputters when reducing throttle

by Roger Lee » 11 years ago

Roger Lee

128 5.28k 4.98k

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

Report

You do not have permissions to reply to this topic.

Title	Category	Replies
Carb sync varies over throttle range	912 / 914 Technical Questions	5
Throttle calibration and idle RPMs	General Tech Discussion	1
Lighter Throttle Springs	912 / 914 Technical Questions	2
914 throttle lag, mag rpm drop	912 / 914 Technical Questions	4
Wastegate cycles but not with throttle	912 / 914 Technical Questions	2

Rotax912ul sputters when reducing throttle

Recent Videos

Safety First!

Prize Giveaway!

Log In/Out

Login