The engine has electric-starting with a kick-start backup.
First gear is lower than the YZs and sixth a jump over the YZs fifth. The changes in the transmission are substantial with a six-speed wide-ratio tranny. The cam timing and profile is claimed to be identical with the only difference being an altered decompression ramp on the exhaust cam to accompany the electric starting. The engine, from the power producing side of things is identical to the YZ250F from the forward mounted 44mm throttle body to the end of the competition-only muffler. Suspension components are the same as YZF, except for the lighter spring rate on the fork and altered internal valving set specifically for off-road riding/racing. The frame is identical to the WR250F and does differ in some mounting tabs, as in skid plate tabs (which is not standard) and some of the electronics, the bigger changes are in small details like the thinner engine mounts to allow more flex. The architecture is all YZ including the rearward exiting exhaust, the air-box atop the engine and the frame’s geometry and the components attached. But from a performance view there are quite a few very specific similarities with the YZ250F and then necessary differences. The FX is an all-new machine but takes heavily from the YZ250F that was so spectacular last year ( Click here for a link to the test). Motocross performance with off-road essentials, and not too many of them.Because of this, talks began early on with regard to using the 250cc YZF platform to create the YZFX off-road racer. Luckily a very motivated group of project engineers in Japan have a thing for this off-road segment.
Gytr flywheel weight yz250 series#
The starting grids at events such as the GNCC series displayed this trend no matter how well Yamaha racers did on converted YZ machinery. And getting that hybrid, a mostly motocross bike with an electric-starter, six-speed transmission, 18-inch rear wheel was basically impossible unless you went and simply bought a KTM or got close by building one yourself.
But lately that in-between bike did not exist in the company’s lineup, it was YZ or WR or nothing. Even before the riding time of many reading this test, remember the IT?. Did Yamaha mix the ingredients correctly?Īs new as this Yamaha YZ250FX may seem in concept, Yamaha has been mixing the lines between the Motocross and Off-Road in a competition-only form going back as early as the 1970s.Refreshing to see Yamaha back in the game, properly.Yamaha's stab at KTM's competition off-road dominance of late.
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