VOL. 51 ISSUE 18 MAY 6, 2014 P71
We can definitely vouch for the
fun part. Big-bore kits for 250Fs
are a kick in the pants and we
were reminded of this recently
after spending a day at Starwest
Cycle Park on a very pumped-
up 2014 Honda CRF250R that
was fitted with a Cylinder Works
270cc big-bore kit (and more).
So much fun!
In the $650 Cylinder Works
box you'll find a very stock-look-
ing cylinder, a 3.2mm larger
forged Vertex piston (complete
with rings, circlips and wristpin),
and a Cometic top-end gasket kit.
Once installed, your CRF250R is
now a CRF270R.
The Honda we rode was also
fitted with a Hot Cams stage-two
camshaft, something our Cylin-
der Works representative said
isn't completely necessary to
run with the big-bore kit but well
worth the extra $270 if you want
to take full advantage of the CW
big-bore kit. Our CW rep told us
that the CRF250R gains three
horsepower and about three ft.
lb of torque with the 270 big-bore
kit alone.
To increase those numbers
a little further, however, our
CRF250R was also fitted with an
aftermarket exhaust system, in
this case, FMF's dual Factory 4.1
RCT Ti Muffler and Ti Megabomb
header. Again, not a must-have
addition, but… what the heck. If
you're going this far – and most
people do – a pipe is a natural
mod. He did, however, highly
recommend fitting the big-bore
kit with a better-breathing air
