On The Pegs March 2019 - Volume 4 - Issue 3 | Page 118

On The Pegs
DIGGING DEEPER...
ENGINE (GNCC SETUP)
• EXC cylinder head
• EXC crankshaft
• Balance the crank
• 450 clutch springs
• Adjust valve lash
• FX piston
the truest form it can be. We have
some special valve lash or valve
clearance settings that we use
that we know make the bike start
good. Then we adjust the ECU and
make sure it’s got plenty of fuel
and is flowing right, because now
our intake velocity speed is faster.
We use the FX piston. We use the
standard piston and we just have
to machine the head for it to ac-
cept that. Technically we got a lit-
tle bit more compression. The bike
will run on pump fuel. We build it
so that it will last. We recommend
some particular oils that will give
it some longevity. Evan will do the
rest of the bike.
The crankshaft is a full round
crank. A lot of people think it’s
heavier. Well, heavier can do a lot
of cool things. When we’re done,
the package just works. We do
things like use high volume head
pipes. For example, on last year’s
engines we used a 350 header
pipe on a 250. For guys that don’t
like so much on the 350’s, we tell
them to put the 250 head pipes