JGR bike is titanium. The RM-Z250 easily meets the AMA’s
minimum weight requirement.
The 250-built engine JGRMX first got from Suzuki was
mainly developed in Europe for the Grand Prix series.
Since Supercross is so different from outdoors, the engine,
although fast, didn’t have the bottom and mid needed for
tight Supercross tracks. Phil spent most of his preseason
in California getting the bike dialed for the 250 West
Supercross series. Phil told us that coming into the season
he was really happy with what they achieved with the
total package. The engine had the bottom and midrange
he wanted, although they were still trying to find a way
to get more over-rev so the bike could pull the same gear
another 10 feet or so.
“This is the best chassis I have ever raced with,” commented Phil. The out-of-the-box RM-Z250 chassis is great
for Supercross due to Suzuki’s turn-at-all-costs philosophy.
Phil, however, felt that the ergonomics of the bike were
off for his style of riding. It felt low in the front and high
in the back. To make him comfortable, he ran 33mm-high
bar risers, as well as a 5mm spacer that went under them.
He also moved the bar mounts 1mm forward. He felt like
the rear of the bike was kicking him in the butt at times,
so they cut and lowered the subframe and shaved the rear
“WITH A PLETHORA OF FACTORY
PARTS COVERING THE BIKE, WE
WERE MOSTLY INTRIGUED BY
TWO THINGS. THE FIRST ONE
WAS A WIRE THAT WENT INTO