A stock Blaster has around 19hp, vs. your 300, which is probably less, and is probably heavier. A stock Blaster does around 55mph, which is what a stock 300 ex should run close to also on top end, but the Blaster will out accelerate it.
If your getting beat by a 250ex, which uses a recon engine, and a non pumper carb with less hp, and a top speed in the 45 to 48mph range(I think)I agree with the above posts,,, with mods you have to rejet, or simply put it back to stock if you can. I would find out the stock compression numbers for the 300ex, and check yours to see if there is a difference. With it running lean the way it is, it will damage the engine over time causing it to lose power.
Read your plug as was stated, but it will appear whiter than they used to with todays ethanol fuel due to it burns hotter than non-ethanol fuel.
05 Suzuki DR650, Mikuni TM40 flatslide pumper carb,JE 10.5:1 piston,stage 2#190 Webcam,open airbox, Twin Air,full FMF system,Pingel fuel valve,Ricor Racing rear shock, Ricor Racing fork Intiminators, Progressive springs, Sargeant seat,DRZ250 tailight,custom plate,LED's,GPS,sumo fender,PT bars,Cycra brushguards IMS lowered pegs, aluminum skid,bearing chain roller,Pirelli,tank bag(gone)
06 Zuk KQ700, Kenda Bearclaw HTR radials Warn RT25 w/ syn. line, 1.5mm clutch shims
Last edited by stu5969; 05-10-2011 at 08:44 AM.