707-R 2014 KTM 250SX Build
2018 is a year of not many changes for the KTM XC and SX line up, other than air and mid valve piston along with a few little things. We really feel we have the 18 and older settings right where we want them to be for MX, XC and so on.
Owner Joel has been actively racing A Vet cross country, AA Enduro and expert OTHG MX as well as tons of hours testing back to back set ups with all brands of bikes. After riding a Husky 16 and 17 FC450 as his personal race bike, the the itch to get back on a two stroke has been on the biscuit. Having no reason to buy a brand new KTM 300XC other than brand new and testing would be no real value at this point until there’s a chassis change, we found a cherry 2014 KTM 250SX for $4,100 with 9 easy hours on it.
This bike would be a really good platform for a mean off-road race machine. First thing 707 did was pull the cylinder and replace it with 300XC complete top end kit from Mach 1 Motorsports. For exhaust we went with the classic FMF Fatty for smooth power and great over rev. We were lucky that our original owner had purchased a FMF turbine core two. Underneath we went with a TM design works skid plate and chain block. They also changed the gearing from 13 – 48 to 14 – 50 using pro taper x ring chain and sprockets. This gearing change really helps get more traction and smooths out the whole bike while flipping the axle block further making the bike more stable. 707 is a dealer for Mojo Motorsports and we wanted an 18 inch rear wheel anyway so we decided to give the local company some love and purchase a set of new wheels. Motion Pro bead locks and SKF wheel spacers finished them off. Then we added a 9 oz Fly wheel weight from Steahly Offroad to help keep the bike planted and hooked up.
This 14 KTM SX came with the twin cartridge WP forks. This fork is a favorite for 08 to 13 era KTM racers. Joel at 707 being one of them. 707 went all out on this A kit suspension build with Kashema coated upper tubes and DLC lowers and hard anodized lugs just for fun. It’s always about what’s inside that counts like Huck Valves, light polished fork springs, custom sub valves and 707-R suspension valving curves and settings. Out back we did a new stiffer shock spring along with a MX-Tech low friction bushing and 707-R revalve. Up top we add the tried and true PHDs rubber mounted handle bar mount form KTM. Tires are Dunlop MX3s up front and AT-81 rear. Graphics done by Don at Epic Graphics.