I want to buy an FMF fatty pipe and turbine Core silencer for my 98 blaster. I also have the airbox lid off. I was wondering what jet size some of you have used that worked well with this setup. thanks

 

Daredevil1,
You'll need to consider the elev and general temps of those who may reply to you. Since I have no clue to your elev. or riding style, I'd suggest trying two sizes fatter on your main. The unwritten rule on jetting is to go one size fatter for a pipe and another size for air flow improvements. The final test is of course to ride & check performance & do a plug read. These two things will tell you the real answer.