jetting for new 300 racing 2010

[fabulous furry]

i just received a new 300 racing 2010 which is actually a 2009 model out of the box but unfortunately came with the street legal gizmos that i removed but found out that the carburation feels limited my 250 EC has twice the power !.can anybody help me with the main jet and idle jet for sea level hot climate ?

[bondo]

I've got a 2008 DE 300 (same as EC, but no lights and smaller flywheel).

The jetting is #178 main. #45 pilot. LTR needle, clip in center position (call Les at LTR). Air screw , 2 - 2 1/2 turns out.

We run Bel-Ray MC-1 @ 50:1 with pump gas. (The Bel-Ray is a little dirty at the exhaust outlet, but does great at keeping the top end and main bearings in good shape).

Our bike starts easily, runs clean and crisp from bottom to top and doesn't foul plugs. It pulls strong throughout and runs away from our KTM 400.

[fabulous furry]

thanks for that but i had to reduce the main jet to 172 and it is still fooling plugs.the idle jet is 42. I use 1 % maxima castor 927 so can't go any lower in mix.

[stevethebrit]

Sure you got rid of all the street legal stuff?

[Nick]

If it came street legal it could possibly have pipe with catalyst inside, although racing shouldnt have it but possible nonetheless.

[fabulous furry]

the pipe mounted on is silver like an fmf the other one that came in the box is black with a tube sticking out.