even though dakota bailed, hope he will read this. I have a buddy who races banshees and has all his shee porting done by kevin at Her Juggs. He ended up trading an old ass suzuki for a his first yamaha blaster. He ended up getting the blaster ported by kevin also. His jug came back looking quite similar and was also recommended a 39mm carb. He ran it no questions asked. Ran like a raped ape with stock bore and +3 stroker. He did jump between 3 different pipes till he found a dynoport really ran the greatest with the porting and 39mm. Not a lot of low power like a 2 stroke should be, but when she got to the mid rpm range you better hang the f*** on. It did take him about a week to dial the carb in but after that no problems at all.