Switched to a nibbi pe28mm carburetor and this is how it went. slapped the nibbi on stock and ran okay but definitely on the lean side. as I start tweaking, it went up to a 120 main jet initially. It consumed too much fuel and its fuel eco tanked. I then lowered the needle one slot and went down to a 115 jet which put me back to lean and so i changed the jet to a 118 and there it is, i hit the swee spot for me. from then on I adjusted the air/fuel mix (ended up around 1 3/4 turns out each time) and put in a ffresh plug to see what goes on. Bottomline ive been satisfied since then, nibbi ftw for now. lol. throttle response is way way better now and much smoother. defo worth the upgrade.