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Rpm drop

  • IRAM
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3 months 1 week ago #20210 by IRAM
Rpm drop was created by IRAM
I bought a UL Pipistrel with a rotax 912 engine and the problem that I have after flying 350 hours is that when I apply the engine to more than 3200 rpm it starts to drown and descends to less than 2500 rpm.
I already changed oil and filter, spark plugs, cleaning carburetors with membrane change and the fault keeps doing it, someone can guide me, I do not know what to do.
Thank you very much

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1 week 4 days ago #21083 by Zisheepk
Replied by Zisheepk on topic Rpm drop
Hi, i am having problem during warmup.
Probably due to cold weather.
OAT is 5 celcius
I start the engine with choke and keep it 1900 rpm for 2 min and then increase throttle to around 2700 rpm for warmup and then rpm starts to drop gradually and slowly upto 1700 at the same throttle. Then i had to incease more throtte. Happens a few times until my engine is fully warmed ( cht 90 oil temp 80).
It happens only when i start it early morning.
All other engine parameters seem ok.
Now same thing happened to my friend's 912.
I have never experienced such thing before.
I replaced the mechanical fuel pump and same result no change.
Expert advise required please. Help!!!

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1 week 4 days ago #21084 by Zisheepk
Replied by Zisheepk on topic Rpm drop
Same thing happening to me during cold start warm up. During warm up RPM drops from 2500 to 1700 slowly. Please help anyone?

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1 week 3 days ago #21093 by RobSeaton
Replied by RobSeaton on topic Rpm drop
sounds like you are running out of fuel.
Filters clean?
check the flow rate?

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