Finally, the ATC’s stock ignition
system was swapped out for one from
a mid-’90s CR250 dirt bike. The CR
ignition was purchased used off of
eBay for $65, saving some big money
over purchasing new. This setup fea-
tures a much lighter flywheel and
different ignition curve, working with
CT’s internal engine work and bolt-
ons, dramatically enhancing the way
the engine builds rpm. The only real
drawback is that the engine can’t be
lugged quite as low in the rpm, thanks
to the reduced flywheel weight. This
mod might not be ideal for the casual
woods rider, but for a pro-caliber
engine build, it helps the engine rip
throughout the rpm range.
The suspension, while good in its
day, needed some serious improvement in order to deal with the
demands of a modern motocross
track, the longer Lone Star swingarm,
a pro-level motor build, and the quest
to out-jump the competition. Thanks
to the vintage and modern ATV suspension experts at Race Tech that
was accomplished while keeping the
250R’s suspension truly vintage.
Race Tech installed its gold valve
emulators to mimic the function of
a cartridge fork, separating out the
compression and rebound circuits,
allowing them to be tuned individually. Race Tech’s stiffest fork springs
were still a bit soft for the 250R, so
they were swapped out for a set of
Progressive Suspension’s progres-sive-rate fork springs, which start out
plush but become much stiffer near
the end of the travel.
The rear shock’s piston was
replaced with Race Tech’s high-flow
gold valve piston, along with custom valving. The stock spring was
replaced with a stiffer spring. Both
ends received fresh fluid, and any
worn items were replaced upon reassembly.
Race Tech took care of the suspension rebuild for this racing ATC. They
replaced all the worn-out parts, including an upgrade of stiffer springs over
Rath’s nerf bars are constructed of aircraft-grade aluminum and feature built-in
netted heel guards and massive stainless steel footpegs.
This ATC is a fully built racing machine, which means it’s got the power to clear the
big hits and suspension to soften the landings.