Thanks Fester (uncle?) I have pulled the snorkle, although I do get different opinions on that from various experienced guys and I have a 45/105 combination. I am at about 700' above sea level in NJ. It runs great at low revs but the from maybe 2/5ths throttle on up it is crap. I don't get it. At full throttle it actually dies. Thr float is pretty close to where it shoudl be and there is plenty of gas in the bowl but it feels like it is running out of gas. Could the needle position do this? The only other thing I have that is not standard is a stainless head pipe that is slightly narrower tubing than stock but it ran perfectly befroe the carb swap. I put the standard back on and it is flawless again. But I am installing an XR200 cam this week and figure I will need the new carb to play with the jetting to get it perfect. BTW, I have ridden one iwth the cam and the power increase at mid and top is substantial and it is still good on the bottom. The guys bike I rode and a very clever airbox trick, a REED from a TY350 Yam, placed over the airbox inlet, with stragegic holes drilled in it for low speed breathing. AT high RPM's it flexes to open and allow more air in. His bike was perfect in the power dept. Besides my jetting issue, what did you do about the throttle cabe for the XR100 carb? It is about 2" too short for my 6" Renthals. Thanks!