of using Moto Tassinari VForce reeds, for 2014, KTM switched to Boyesen RC2 performance-weave carbon fiber reed petals housed in a KTM-designed reed block. We use the word “designed” loosely here, because the KTM reed block mimics the VForce with its twin Vs and eight petals. Q: WHAT ELSE IS NEW ON THE 2014 KTM 125SX TWO-STROKE? A: Do you know the difference between a model- specific update and a brand-specific update? Model- specific changes are ones that are introduced only on one model, like jetting specs or ignition maps selected for one machine. Brand-specific updates are modifications that are done to every bike in the product line. There were five brand-specific updates on every 2014 KTM, and they are as follows: (1) Front brake. While the front master cylinders on the 125SX, 150SX, 250SX, 250SXF, 350SXF and 450SXF got new front-brake reservoirs, reshaped levers and smaller- diameter pistons (down from 10mm to 9mm), the 125SX and 150SX are the only Katooms still using Magura hydraulic clutches (the rest have Brembo clutches). ( 2) Seat foam. The foam core of the saddle has been reformulated to be softer initially but not break down as quickly. ( 3) Gas cap. The internal threads on the gas cap have been reworked for more positive engagement, and the gas cap has a new low-profile shape—it doesn’t stick up as high as last year’s cap. ( 4) Swingarm. KTM lightened the chain guide by 120 grams and beefed up its swingarm brackets. ( 5) Plastic. For 2014, the graphics on the shrouds, air- box cover and side winglet are permanent in-mold decals. Q: WHAT’S THE DIFFERENCE BETWEEN A 125SX AND A 150SX? A: In essence, the KTM 125SX and 150SX share everything save for the obvious engine parts. Here is the list: (1) Displacement. The 150SX is a 143.6cc. The 125SX is 124.8cc. ( 2) Bore and stroke. The 150SX bore and stroke is 56mm by 58.4mm, while the 125SX is 54mm by 54.5mm. ( 3) Gearing. The 150SX comes with 13/48 gear- ing, while the 125SX gets 13/50. ( 4) Parts. The crank- shaft, cylinder, piston, power valve and rings are different on the 125SX and 150SX. ( 5) Clutch. The 150SX uses all steel drive plates, while the 125SX uses aluminum drive plates, except for two steel plates in the middle of the clutch pack. The 150SX also has stiffer clutch springs. ( 6) Jetting. Last year, the 125SX and 150 shared the same jetting specs. This year, the mainjet, pilot, needle and clip position are all different. Q: HOW FAST IS THE 2014 KTM 125SX? A: Given that 125cc two-strokes have the least horsepower of any full-size motocross bikes, they are at a disadvantage in deep loam, big jumps and head-to-head races against bigger engines. Yet, horsepower isn’t the be all, end all of motocross, which is why you occasionally see a Vet on a 125 two-stroke run down a pack of 450- mounted competitors. Still, in most cases, there is no
2014 KTM 125SX 2014 KTM 125SX: A few years ago KTM stopped importing 125 two- strokes because KTM 150SX sales
dwarfed 125SX sales, but consumer
demand convinced KTM to bring
them in again. Good call.