The KTM 300 is the second-best-selling engine group (first is the 350) in KTM’s lineup. People can’t even find them, as the
sell-through is staggering. This makes the 300 conversion kit all
the more appealing, since it’s much easier to find a 250—and
you can probably even get a good deal on one. This project
KTM 250SX came to us fit with a KTM Power Parts 300 cylinder
kit and a bevy of Wiseco parts in the high-compression piston
and clutch. It had a Pro Circuit performance exhaust and suspension, plus a dose of bling, running gear mods and ergonomic
updates. It was setup as a vet motocrosser, with the suspension
set for a 200-pounder who craves the outdoor MX world. The
pilot wanted a machine that could fight with a 450 and dance
like a ballerina. It turned out to be a rocket of titanic proportions.
It started life as a 250SX and morphed
into a 300cc MX weapon.