04 RM 250 jetting for MX

[motolink]

Anyone got the right MX jetting for the 04 RM 250, mine is standard except running two base gaskets.I race mx. Sea level temp 70. Does leaning the high speed riching jet improve the top end power ?.

 

[bclapham]

Does leaning the high speed riching jet improve the top end power ?.

usually when you lean the main jet, you make more topend and overrev.

since you have the 2 basegaskets, the compression should be a bit lower so you have to room to lean it.

i run a 162 main on mine with no detonation on pump fuel.

 

[motolink]

I am running a 168 at present , will gi down to a 165 and test. thanks