912 ULS rough running at 4600 rpm

[hallschuch]

hello everyone,
I have a kitfox S7 with a 912 ULS , after flying for about 1/2 hour the engine has these instantaneous misses every few seconds or so between 4500 and 4600 rpm.
When I change the power setting it seems to go away.

I've cleaned the float bowls (found some small particles in the left bowl) , I weighed the floats (they're in spec), I've installed carb heat, I've done a flow test, I've checked the fuel filter.

Any Ideas?

Thanks.
Karl

[Dusty]

I had a similar situation a while back.
After trying the usual suspects, I decided to turn one ignition at a time off in flight.

After finding the culprit and fitting another module this hasn't returned. The miss was more like a random kick to the airframe.

[hallschuch]

great idea! thanks