jetting for fmf and k&n

[Red_250EX_Rider]

What would be a good starting point? 845 feet above sea level.

[ajw2685]

I am at ~600 feet and I needed a 40 pilot and 168 main for my stock air box with a few holes in the lid and a Lexx MXE slip on.

Some people around here claim they are running a 152 or 155 with a slip on.

Personally, I would start with at least a 40 pilot and 160 main and then work from there based on spark plug color and engine performance.

[01boneless]

158 main 42 piliot 2.25 turns out on a/f screw go up or down from that.

[finsteratv]

i had a 160 main and 40 pilot with Sparks filter and box lid on. also had choke taken out. Runs great and is my little brothers dune bike.

[finsteratv]

plus full big gun exhaust

[Red_250EX_Rider]

Alright thanks guys

[jake"08"400]

Same elevation mines a 155 42 pilot 2.5 turns out stock needle clip position.