but also the aluminum frame, billet hubs, CNC- machined components, billet triple clamps, hydraulic- clutch slave unit and the complete engine. On their four-stroke models, TM even makes its own throttle body. We mention all of these exotic parts to soften the blow of the price tag. The Manufacturer’s Suggested Retail Price (MSRP) for a 2013 TM 250MX two-stroke is $8300. MSRP for the 2013 TM 300MX is $8450. Q: WHAT DO THEY WEIGH? WHICH ONE IS LIGHTER? A: The two bikes are virtual clones, and they weigh the same. We expected the 300MX to be a little heavier because of the larger piston, but the weight gain was offset by the fact that the cylinder was bored out bigger. The TM 250MX and 300MX hit MXA’s scales at 219 pounds. Q: WHICH BIKE MAKES THE MOST HORSEPOWER? A: No need to ask. Common sense would tell you that the 300MX is bigger and thus more powerful. In our dyno runs, the TM 300MX produced 45. 98 horsepower, while the TM 250MX was down at 44.02.
Q: HOW DOES THAT COMPARE TO SIMILAR MODELS? A: The dyno is not kind to either TM, but especially not the 250MX. The TM 300MX mimics a Yamaha YZ250 two-stroke powerband from 6500 rpm all the way to peak at 8200. After that, the big piston of the 300 chugs down, while the YZ250 climbs another 500 rpm. If you throw the KTM 300EXC into the mix, you get a blowout by KTM. The TM is below the 300XC’s horsepower all along the power curve, but especially at peak where it gives up over three horses. Since the 250MX is the weak sister of the two, it loses to the KTM and the YZ250 by even bigger margins. Q: HOW ALIKE ARE THE TWO ENGINES? A: They are completely different. Diametrically opposed to each other. Night and day. Abbott and Costello. Dr. Jekyll and Mr. Hyde. We expected as much when we saw the spec sheet. You can’t increase the bore by over 5mm and not drastically change the engine’s torque curve, powerband and rev range. Q: WHAT IS THE 250MX POWERBAND LIKE ON THE RACETRACK? A: When the 2013 TM 250MX comes on the pipe, it hits hard at 6500 rpm and revs to 10,500 rpm. It has the kind of jolt that you expect from a high-tech, TM 250MX VS. TM 300MX
2013 TM 250MX: The TM 250MX has a
typical deuce-and-a-half powerband. It
isn’t the most powerful 250 on the
track, but it has a distinctive powerband and an aggressive hit.