Hey kxsinoz, nice that the rim color on those new excels is pretty d**n close to your paint. Good looking bike. I just got a 420 motor and I am thinking of building an ultralite aircooled bike with a new generation aluminum frame. I have a tech question for you. How long does the motor on your 420 run before you notice a drop in performance due to it being air cooled? I typically am looking at 20 minute motos and am wondering if the performance loss would be noticeable. Thanks.