Poulan 42 using stock carb and a type F plug. Zinger 18x6 prop.
I tried 4 gas to 1 fuel. Using 15/18. Gives me a 4 to 1 and 3/3.6
Idle was a problem. All else seemed ok. Transition is unbelievably fast. Almost as fast as I can pull it open manualy. Top rpm, 6800.
Then I mixed 2 parts fuel,15/18, with 1 part methanol. Makes 10/11.88. Then mixed that 2/1. Gas/fuel. Makes 2/1 at 3.3/3.96
Idle was noticably better. But then I discovered that the low mixture screw needed to be a lot richer to be able to get low rpm control. Otherwise it went fron idle to midrange with nothing in between. I think if I had played with the mixture more with the other concoction I may have been able to get the idle better.
I tried unsuccessfully to get a good 2 stroke idle. Idles low and reliably (1800) with a 4 stroke idle. But it shakes the test stand more just as it would a plane. And I think it sounds like some detonation at the lower/midrange rpms. And in transition. Full throttle is too noisy to tell.
Top rpms....... First batch was 6800 with a Zinger 18x6.
Second batch, well I can't remember for sure but I think it was 8600. She was screaming. Flying buddy 3 blocks away heard it and came to check it out.
So at this point if I could get a nice 2 stroke, or close to it, idle and get rid of the detonation, if that is what I am hearing, then all would be good.