Twisted Yamaha YZ270 F Project Build Motocross Action Magazine
, motocross, dirtbike, racing, motorcycle This isnt our first rodeo building a bigbore YZ270F using the Cylinder Works full kit which is why we wanted to do it differently this time around. The YZ250F is known for its robust lowtomid power. When you add in a bigger piston and equally big cylinder, the alreadyshort and focused powerband can shrink into a narrower window. Yes, the YZ270F is even more explosive out of the hole, but it chunks up the alreadyshort power curve. The bigger piston has to push more air per stroke, which makes it struggle to carry speed at high rpm. The lack of overrev means that the rider has to shift on the bubble. This style of power can boss a rider around if he doesnt bow down to its imperfections. We wanted the best of both worldsin short, a YZ250F bigbore with a powerband that was linear and revved to the moon. Was it possible We knew building a bigbore engine from the ground up was the way to go; however, we didnt think Yamahas pencilpushers wer br,
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