Last year the Yamaha got a new, more compact
frame among other things. For 2013, it returns
unchanged. The price goes up slightly to $7290.
end. Most riders swear it’s faster than a Honda or Suzuki
because of this, but the dyno proves otherwise. In real-world, turn-to-turn drag races, the YZ generally gives up
a little to the other Japanese 250s.
Interestingly enough, most riders also notice some
uneven carburetion. Jumpers can make the engine hesitate between zero-G situations like rhythm sections, and
if you’re a knot-head with too much throttle too quickly,
you can induce a motor hiccup. EFI bikes don’t do these
ANOTHER YEAR FOR THE CARB
There are ways of dealing with carburetor glitches.
R&D Racing and Boyesen have specialized in that. The
YZ250F actually proves that the carburetor was rushed
out the door prematurely. It still offers performance and
weight advantages that EFI can’t or hasn’t yet matched.
Still, the book is about to shut. The Keihin CRF carburetor is difficult to manufacture with so many complicated circuits, pumps and chambers. By comparison, a
throttle body is just a hole with a butterfly valve. Keihin
would rather sell the latter. That, of course, is irrelevant
to the racer. And for now, that makes the YZ250F as
important and competitive as ever. And now, there’s
nothing like it. ;