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914 ul can only idle

  • Pieter Bezuidenhout
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1 month 1 week ago #17144 by Pieter Bezuidenhout
Pieter Bezuidenhout created the topic: 914 ul can only idle
I have a Rotax 914 UL installed in a Sling 4.
After 4 hours of perfect performance during flight testing the engine now won't rev past 2500 rpm.
It is starting easy, idle and rev to 2000rpm without problem, but going faster the engine will stop.
I suspected fuel starvation but the fuel pressure and flow from pump seem to be OK, EGT's are same for all cylinders.
Any advice?

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1 month 1 week ago #17146 by Rob Seaton
Rob Seaton replied the topic: 914 ul can only idle
Inspect your fuel filters (also finger screens in pumps if you find any contamination) and float bowls. You may have serious fuel contamination.

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3 weeks 4 days ago #17338 by Michael Burton
Michael Burton replied the topic: 914 ul can only idle
Make sure the idle screw is set correctly and that the O-ring on the idle screw is in good shape. If it is damaged the idle will be fast and when the throttle is advanced the engine will die.

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