MXA VIDEO: WE TEST A TWISTED BUILT YAMAHA YZ270F BIG-BORE

MXA VIDEO: WE TEST A TWISTED BUILT YAMAHA YZ270F BIG-BORE

This isn’t our first rodeo building a big-bore YZ270F using the Cylinder Works full kit ($549.95), which is why we wanted to do it differently this time around. The YZ250F is known for its robust low-to-mid power. When you add in a bigger piston and equally big cylinder, the already-short 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 already-short 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 over-rev means that the rider has to shift on the bubble. This style of power can boss a rider around if he doesn’t bow down to its imperfections. We wanted the best of both worlds—in short, a YZ250F big-bore with a powerband that was linear and revved to the moon. Was it possible? We knew building a big-bore engine from the ground up was the way to go; however, we didn’t think Yamaha’s pencil-pushers were in the mood to R&D a totally new bike. So, we went with the next-best option—Jamie Ellis at Twisted Development. He is a master at finding the perfect power profile for his customers. So, we asked Jamie if he could make the tried-and-true Cylinder Works YZ270F top-end kit more powerful and broader at the same time. In essence, the engine of our YZ270F felt similar to a KTM 350SXF but with more excitement down low. Every MXA test rider loved this bike—after he put his earplugs in. We admit that it took a boatload of dough to complete this build, but we felt we had to. It was something that we yearned for. So, we had to build it at any cost.

READ THE FULL YAMAHA YZ270F STORY | CLICK HERE

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