Main jet question

[engmedic]

I am running a 170 main, 45 piolet, K&N with open airbox, FMF Pipe, I typically ride on the oregon coast which is at sea level. I feel in 3/4 to full throttle I am losing power. Any ideas about what main jet I should run. Thanks

[tprender]

If you have a stock engine with stock jets, try a 155 main.

[TravEX]

i am running a 45 pilot with 165 main after running a 170 for a while,,,try going down a jet size to see if it helps,,,

[engmedic]

thanks for the help I will give that a try.

[jb400exxx]

with my mods: T-4, K&N filter, no choke, no lid, i run a 42 pilot, needle clip drowped one notch, and a 165 dyno-jet. and it runs great.