Jetting Question!

[TeamC&GRacer]

Hey guys im running a 426ex high compression motor. I am running an lrd full exhaust system, no airbox lid, and a k&n filter with outerware. What main jet are you guys running with your similar 426ex high comp bikes? I am at a 150 testign and its way to lean. What thoughts do u guys have

[jerry-89-250R]

i serviced a buddys 426, his has a 185 main and runs strong "i couldn't believe it" i run a 185 in my fcr on my 440. somewhere between where your at now and a 185 "you know how jetting is"

[kargaaro]

158 main
middle notch
45 pilot
screw-stock

Be patient and work your way up