- Joined
- Jun 30, 2012
- Messages
- 13,901
I use Mk2 Amals which are pretty much Mikunis. From memory the screws adjust the fuel. I've had Mikunis on two-strokes, and I think they adjusted the air.. The old type TT and GP carbs - I cannot remember and it was never important. If you winds the screws in and don't get the miss, you wind them out to get it. In either case, if you don't get the miss, the fuel jet is too big. It is the same with needle jets. If you cannot induce the miss, the jet is too big. But if you are using Amal carbs with petrol, the one thou difference between a 0.106 and a 0.107 is very large. If 0.106 is too lean, a 0.107 might not be a good answer, if you cannot induce the miss.