Jumping revolutions/minute Rotax 912 ULS

[Tomyfly]

After starting the motor the revolution is jumping between 2000 and 3000 r/min
and in the take off it also jumps between 5200 and 6200, only very short jumps, but I get the warning overrevolution ... When flying erverything is fine ....
The Rotax is running very smooth.

 

[aerofurb]

Check the RPM cable connections. I had a similar problem on my first ground run - one of the pins in the two pin plug had pushed back and was making an intermittent contact.

No problems since.

 

[Tomyfly]

I checked the ground and the sensor calble (Pin 3 Ground, Pin 32 Rotax Sensor) The rev./min are jumping only in turbulences and turing take off. I think I have to "recable" all.
Has anyone an other idea?

 

[trevpond]

I reckon you have a loose wire/connection somewhere.


Trev

 

[Tomyfly]

it was deffenitfly not the conection! I changed the two cables sensor and ground, now it works fine!