A Steahly 9-ounce flywheel was added to smooth out the delivery of the power curve, along with an FMF Factory Fatty pipe. Dick
wanted Chuck Sun and MXA to run the longer Powercore silencer, but we both preferred the short version.
Chuck Sun could. The 1980 AMA 500 National
Champion and winning member of the famous 1981
Motocross des Nations team wanted to build the ultimate
KTM 300SX, and he knew just the man to do the job
for him. Dick Wilk of Dick’s Racing is a KTM specialist,
which wasn’t very prestigious six years ago; but, with the
popularity of KTM today, it is a badge of honor. Chuck
asked Dick to look at the KTM engine and suspension
and see what he could do to make it into the best two-stroke race bike ever made.
DICK HAD CUT HIS TEETH BACK
IN THE DARK DAYS OF THE OLD
PDS NO-LINK SYSTEM, SO HE IS
VERY HAPPY TO BE WORKING
TODAY WITH THE MORE SOCIALLY
Dick tore into the 300 engine and found lots of stuff
that could be improved. He discovered that the top of
the piston didn’t line up with the bottom of the
transfer ports, so he raised the cylinder to maximize flow.
However, raising the cylinder decreased the compression, so he milled the head and reshaped the combustion
chamber with a special radial groove design to improve
fuel misting. The bigger displacement, improved transfer flow and better combustion easily overstressed the
stock 36mm Keihin carb (especially given that the KTM
125SX comes with a much larger 38mm Keihin). To solve
this problem, Dick taper-bored the stock 36mm Keihin
The MX1 shock has a more restrictive piston than the stocker
to make the rear shock feel more progressive from start to
finish. The finned MX1 reservoir uses a bladder to reduce fluid
temperatures. The stock nylon preload adjuster was replaced
with an aluminum unit riding on a spring bearing.