2017 HONDA CRF450R
FIRST RIDE
P74
ments for engine and transmis-
sion on the Honda CRF450R, it
is now one chamber for both. A
new dual-stage scavenge pump
system reduces the oil volume
from 1490cc to 1250cc. This
helps reduce weight and simplify
maintenance. The clutch is more
compact and uses one less
friction and one less drive plate.
The drive plate thickness has in-
creased from 0.4mm to 2.0mm.
The transmission ratios have
changed for 2017 to go along
with the primary gear change.
Final gearing is 13/49, one tooth
larger on the rear than in 2016.
An advantage to a completely
new bike is that starting from
virtually scratch lets designers
toss what they don't want out the
window. The 2017 intake tract no
longer passes around the shock;
it is now a downdraft system
running above a now lower-
mounted shock. As proven with
other manufactures, a downdraft
system improves power and
response.
Throttle pull is also lighter,
helping to improve response
feel. With the engine and chas-
sis changed, the exhaust system
is—ready for it? All-new as well.
It still retains the dual mufflers,
but they are now 78mm closer to
the center of the bike while the
header and shape are revised to
increase flow.
Putting the power
to the ground
efficiently was a
top priority in the
design of the '17
CRF450R.
