Rotax 912 ULS RPM Problem

by Jeff Burnette in 912 / 914 Technical Questions 6 years ago

Gentlemen,

When I switch to one mag I drop 200 rpms. When I switch to other mag I drop almost 500 rpms. How do I chase this down so I don't spend money unnecessarily? I looked at all the connections and everything looks good from that aspect.

Thanks

Re: Rotax 912 ULS RPM Problem

by Genival Pacheco » 6 years ago

Genival Pacheco

4 87 135

Engine hours?
hours since the last maintenance? Have the carbs been checked and equalized?
hours on the spark plugs?

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Re: Rotax 912 ULS RPM Problem

by Peter » 6 years ago

Peter

2 10 0

Hi Pacheco.

Have a look at the thread I started on the general discussion forum for some ideas from those you know much more than I ever will.

Peter

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Re: Rotax 912 ULS RPM Problem

by RotaxOwner Admin » 6 years ago

RotaxOwner Admin

59 1.58k 14.5k

(this one) :)

Thank you said by: Genival Pacheco

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Re: Rotax 912 ULS RPM Problem

by Adam Messer » 6 years ago

Adam Messer

20 29 59

I have experienced the same phenomenon. I've got a 912 UL The first time it happened I returned to the hangar, swapped out the plugs, and the problem went away. Hassle, but hey what do you expect?

Subsequently I have had the same problem. After standing on the brakes and cooking everything off at 5000+ rpm for a few seconds the problem went away on the ramp. With the larger oil cooler I have to idle below 2500 rpm for 10-12 minutes before oil temp reaches 120°F, and I believe my mag drops may simply be ascribed to carbon buildup.

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Rotax 912 ULS RPM Problem

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