Jetting For Piston An Cam?

[JIMTED79]

I'm running a white brothers full exhaust system and the ESR air box eliminator kit. The bike is jetted good for what I got but I'm ready for a high comp. piston and curtis sparks cam, do I need to change the jetting for them?

[BOONE450R]

You will more then likely have to drop a couple of main jet sizes do to the increase in flow (more vacuum, higher velocity) from the piston.

[MR.BIG]

I don't think your jetting should change very much if at all.

[speedfreaksguy]

I was running a Sparks full system with no lid last season and only changed the main jet to a 190 and adjusted the air screw. Over the winter I added a Wiseco 13.5 x 1 piston and a stage 2 Hotcam. The bike ran but not good. I have since added the HRC needle and a 50 pilot with the 190 main and its perfect.

[trost66]

I have the sparks full system had a 190 main. Ran it most of the year then at the end of season i put a aggressive drop in from sparks and a 13-8-1 piston and it ran great I didn't change anything