I messed with my ST 2300 carburetor far more than I should have needed to. Jett makes a carburetor just for the ST 2300 and it works very good. I tried a Perry carburetor and pump. Crimp one pipe coming out of the pitts muffler and an OS F glowplug. This worked but the low end on a Perry is very touchy. Jett Engineering turned the ST 2300 pig into a high performance machine. Jett also has a muffler to improve rpm's. I was running the St 2300 in a Sig Cap 231ex. I was using a 17x8 apc prop.