Just got done with 2.9 hrs today, 2.5 yesterday after installing a trail tech 13oz flywheel weight. The 08 crf450 motor seemed to have less "ass" to it on decel than my 04crf450 and come to find out, Honda went with a lighter balancer for 08. Not sure if that was all of it, or the narrower head pipe, or just the fact my 08 doesn't have 1000hrs on it like the o4.. The 08 also has a sensor that changes the timing or something depending on what gear your in (can see the sensor by the shift lever..). I think it softens the "hit" in lower gears..as it really does not have the "ass" the 04 does when your in a very low rpm in lower gears (you mx guys don't have this issue..but we woods riders do ). Talked with teh Trail Tech "tech" before purchasing a fww, and he recomended for the harescrambles that are pretty fast here in FL, no more than 13oz. The bigger fww also requires a slight grinding or mod of the case as it is pretty big. Anyway, this 08 starts easy already, but starts even easier with the hfww, and there was some benefit noticed when going over obsticals, especially felled logs. I find im also able to drag the rear brake harder in a turn without having to pull the clutch in every time like i used to for fear of stalling.. Again, never really had an issue with stalling, and i have no want for a Recluse or other auto clutch, but the fww does seem to benefit woods riding. Was glad i went with this size and not a bigger one i think. Got the flywheel puller from them too so ya don't kill the oil hole on the end of the crank. Install took literally 20 minutes at MOST. Put a wood handle hammer in the sprocket (steel one) to brace against the swingarm when torquing the fw nut to 47lbs.