Hi Sverre

My name is Stephanie and I have taken over from Laurenne who left last week. I have spoken to one of our engine technicians about your problem and we suggest the following - a home-made fuel mix is not recommended. It sounds like a timming error - one tooth out on the timing will make all the difference to running - tickover particluarly. Each port should be equal. The propeller size you are using is correct, we use this size prop (not the same make however) when we test our engines and normally achieve 1400rpm.

I hope this helps.

Stephanie