I'm an hour from Detroit, so we might have a little more humidity than Ohio as far as jetting we be pretty close? I have a yz DR.D
slip-on and the ais jet kit for my 06 that I purchased new last summer, o-ring mod(used 2),grey wire, moved the breather hose for the head to the air box, all the cut outs for the air box, etc., Baja kit, plated, set the AP and I use Rotella T for oil which I change to often @ a sacrifice of a little hp. loss and some clutch drag. All I can say is this thing rocks, 5gear wheelie with a hard pull on the handle bars and 4gear gas only( trust me I got some ugly pictures on this,lol, and that was before I piped it! ) so jetting wise -- 165main - 48pilot - yz needle 3-4 clip down F/S 2 turns out and it is still a little rich on those hot days(+75)!! I ride mostly with my B-law(05crf450f,hot cam,stock exhaust
) most of the time in a drag we are side by side till I pass him, but the crf does have a harder hit it's a traction, weight, gearing thing? Get an exhaust and a header pipe, do the mod's, and then play with your jetting. A stock wr450 is IMO about 34hp., modded you'll get close to 48-50hp., vortex
ign./ hot - cam/ hc piston upper mid 50's. You need a full exhaust system DR.d or fmf4.1 stainless steal system, ti bends to easily or a used yz system will work?