Ok, I put on a 15 up front imediatly after I put on pipes, K&N, and jetted. I only rode it once and it was in packed snow. The problem is I think that i really had to wind out some gears like 5,6 or there was a bog. This might have to do with some bad traction but not sure. Now I ride mostly wide trails, open area, and occasionally drag in dirt. The drags are the reason i went to the 15. I was wondering if when I get a milled head, lightened flywheel, and +4 timeing if I will be able to run the 15 and lose the bog or will I have to go back to the 14? I really wasn't to happy the way it had to be wound out in upper gears before, but havent rode on dirt yet? Sorry about the long post. Any suggestions appreciated.