what size

[hardkoratvmxr]

i just got an hmf slip on for my 300ex and it says go up 5 sizes on the main jet, well the thing is i dotn know what my stock size is so if you could let me know what 4, 5, and 6, sizes up will be from stock thanx.

[44oEX]

stock is 118 -122 I don't remember for sure. but for a pipe and filter a 128 run great normaly. I would start there and see how it runs. then go from there.

[hardkoratvmxr]

i need the sizes though

[44oEX]

why???

just put in a 128

[hardkoratvmxr]

will that size be ok with a k&n and open airbox

[Dannys400ex]

just put it in and try it.

[44oEX]

yes. try it if it's lean cause of your conditions ( temp alavation...) then go bigger from there