you shift up, chop the throttle or run
out the timer clock. Yamaha’s launch
control system is different. How so?
From 4500 rpm and 30-percent throt-
tle openings, Yamaha’s launch con-
trol system reduces horsepower much
more than the competing systems.
Less horsepower translates into less
wheel spin and more forward hookup.
Once the YZ450F clears the starting
gate and travels between 30 and
60 feet off the line, the horsepower
ramps back up to max power without
you doing a thing. Yamaha’s Launch
Control System (LCS) restores full
power once the rpm, throttle position
sensors and gear selector match a log-
arithm that tells the ECU that the bike
is no longer in roll-on power mode. If
you never get the dots and dashes
into the required box—the LCS will
automatically turn itself off when you
shift to third.
TRIPLE CLAMP OFFSET
Yamaha changed the triple clamp
offset from 22mm to 25mm in 2016.
This may seem like an earth-shatter-ing move on the geometry front, but,
in reality, it is just a return to the previous 2009 offset. But, curiosity made
us want to go back to the 22mm offset
that Yamaha originally switched to in
2010. We ordered Pro Circuit’s 22mm
triple clamps and liked the way the
YZ450F felt on the entrance of turns.
It wasn’t a slam-dunk change, but
in conjunction with the longer JGR
shock linkage, it made us as happy as
we’ve been with the YZ450F’s ability
to track through corners without that
irritating wiggle. For more information, go to www.procircuit.com.
GEARING FOR THE MASSES
Every MXA test rider complained
that the bike would fall off the pipe
on the second-to-third shift in heavy
loam, sand or going up hills. We wanted to race the YZ450F in the broader
third gear to avoid having to rev it in
second gear. The fix? Gear it down.
We ran 13/49. The stock rear sprocket
is a 48.
Believe it or not, Yamaha YZ-F spark plug caps have a tendency to blow off. We added a JGR spark plug cap holder.
We added a one-tooth-larger SuperSprox sprocket on our
Tusk wheels. We also ran a TM Designworks chain guide.
Yamaha switched to 25mm offset clamps in 2016, but we
switched back to 22mm Pro Circuit triple clamps.