Box: KTM has four-, five- and six-speed gearboxes that are interchangeable.
FOUR OR FIVE GEARS? Dear MXA, Is it true that I can turn my five-speed 2013 KTM 450SXF into a four-speed? Yes. The American version of the 2013 KTM 450SXF comes with a five- speed gearbox, while the Euro-spec version has a four-speed gearbox. You’d have to get your dealer to pull some strings, though, because the four-speeder is not in stock in the USA.
Juiced up: We breathe it and so does
THE LEGALITIES OF RACE GAS Dear MXA, I’m a 40 Novice-class racer, and my friend said that I can’t run VP U4.4 because it is illegal. Is this true? It’s not illegal for you, but it is for AMA Supercross and National Pros (although that doesn’t stop many of them). In Supercross and National Championship competition, the AMA limits a fuel’s oxygen content to 4 percent. U4.4 is 8 percent oxygen, so it is illegal for big-buck pro racing in the USA and Europe. But, it is not illegal at most local races. Because of its oxygen content, you can expect U4.4 to give a 450 at least a two horsepower boost.
Bolt on: KTM’s two-stroke electric starter bolts on
the cases. The 250SX does not have bolt holes.
CAN I ELECTRIC-START MY 250SX? Dear MXA, Is it possible to install an electric-starter kit on a 2013 KTM 250SX? I just can’t seem to get an honest answer from anyone. If it’s not possible to install one on the 250SX model, I would like an explanation as to why it is not possible. No, you cannot put the electric starter from the XC model on the 250SX model. Why not? Because the new SX center cases do not have the bosses to hold the starter motor. Your best option would be to get an electric-start 300XC.
Label: Don’t trust the name on the
label. The quality differs.
WHEN YOU CAN’T EXCEL Dear MXA, I come from the old days when Takasago Excel rims were the best rims made, but on my new 2012 KTM, the Excel rims seem to be made of butter. Are they the same rims? No. The manufacturers are able to buy what is called “OE Excel rims.” “OE” stands for “original equipment.” The OE rims are made of less expensive material than aftermarket Excel rims. We would suggest replacing your wheels with Takasago Excel A60 rims.