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The AMA production
rule stated that the crankcases and the cylinder casting had to
remain production. Anything else in the motor could be changed. The
mechanical power valve on the factory bike was similar to
production but used fewer parts. The crankshaft is made by HRC
as are most of the other internals. The clutch basket is one of
the few parts inside that remained production. The pipe is the
high power HRC pipe that made big horsepower. For supercross
Ricky used a pipe made by Pro-Circuit for better roll on power.
The rear brake pedal is a thicker and stronger pedal than the
stock one.
Above
you can see the number 18 on the crankcases. The cases were
matched by hand and numbered. Below, the bike uses a works
Keihin carb that is stamped NT7 which is the code for the 250
works bike. Further below, on the clutch cover is a blue
anodized cover that allows the power valve spring to be changed
to different spring weights to have the valves engage at
different RPM's.
The radiators are
massive three core units that provide more coolant than stock.
With someone like Ricky Johnson riding a 250 that puts out way
more power than stock, extra cooling is a must.
A special black box
with enough wires to wire a small house is used and is mated to
a works stator and coil. Nothing even remotely stock here. Below
is a magnesium front hub that is significantly lighter than
stock. The brake rotor is made from different material and the
front brake caliper also houses larger than stock pistons to
provide awesome stopping power.
The rear hub is
machined from magnesium and has huge wheel bearings inside to
handle the load a factory rider puts on the bike. The rear brake
is carried over from the 1985 works bike, while the production
bike used a drum rear brake. The brake rotor is fastened to the
hub with steel fasteners to maintain grip under extreme heat.
Rear wheel failures were non existent. The swing arm is stock
but modified to fit the disk brake system.
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