Ok, Sounds good. I'll stick at 20:1.

P.S. My friend just took the big end out on his Moki 210 petrol with 40:1 synth [:@] We had a discussion before the sudden stoppage along the lines of "Ow much???!!!" but he wanted to try it and knows the risk. He has a new rod to fit now and will be back in the air on more oil than 40:1 soon!


More on carbs:- 22 size is too small and holds the RPM back. 24 without accel pump stumbles in the mid, but the top-end and the idle are great. 24 with accel pump seems to be the best combination, although a 28 with pump will probably be good. 28 with no pump has similar top end to the 24.

I modded the butterfly on the (slightly worn out) 24 with pump to increase air over the idle jet:- it seems better still, although with the worn spindle I'm not convinced. WOT in a hurry after a minutes idle is pretty good, with good mid. WOT in a hurry after 10 seconds idle is great and so is mid!

So accel pump needed for 4 stroke 180 and bigger than 22 as far as I can see.

Brrom! Brooom!