TWO-STROKE VERSUS FOUR-STROKE: 2012 KTM 250SXF VS 2012 KTM 250SX News…

15 Июн 2015 | Author: | Комментарии к записи TWO-STROKE VERSUS FOUR-STROKE: 2012 KTM 250SXF VS 2012 KTM 250SX News… отключены
Kawasaki Square Four 2 Stroke Prototype

TWO-STROKE VERSUS FOUR-STROKE: KTM 250SXF VS 2012 KTM 250SX

by popular demand! The MXA wrecking answers the age-old question one time—what’s better, a 250 two-… or a 250

And in this corner. the 2012 KTM two-….

The MXA wrecking crew can one promise with this a KTM is going to win. In truth, is the best two-… versus comparison possible. Why?

the KTM 250SX two-… and KTM 250SXF are models. They have updated every year for the five years—and they apples and oranges. This is as and as accurate a head-to-head comparison can

These are both brand-new, up-to-date machines. and are representative of classes. True, we could done a Yamaha YZ250F YZ250 shootout, but it would, in be a test of seven-year-old technology—interesting, but not

As it stands right now, the YZ250 two-… is no match for the KTM two-…. The KTM is a vastly superior (with the exception of the suspension The KTM is faster, more powerful, handling, quicker stopping, lighter and fresh off the drawing

The Yamaha is, at best, 2006

And wearing the orange trucks. the KTM 250SXF four-….

So, the MXA gang to do an all-new 250 shootout, comparing a against a four-…. Since both bikes have legal to race in any 250cc at the local and regional level—250 (D), 250 Novices (C), 250 (B) and 250 Experts (A). The choice a 250 two-… and 250 four-… has significance for racers from Punkin Raceway to Loretta Lynn’s.

As you expect, AMA Pro Racing does not two-strokes of equal size near its favored four-strokes in or the AMA Nationals.

The MXA wrecking crew has of two- and four-… experience, so it was natural that we answer the that every AMA Amateur be asking. Which is better? A KTM two-… or KTM 250SXF four-…?

Q: DO THEY COST? WHICH ONE IS

A: The manufacturer’s suggested retail (MSRP) for a 2012 KTM 250SX is $6899. MSRP for the 2012 KTM is $7699. That makes the $800 cheaper.

If you compared the KTM 250SX to a four-… of any the dollar difference goes up $500 in favor of the two-….

Q: THE DIFFERENCE BETWEEN THE 2012 KTM AND THE 2012 KTM 250SXF?

A: One of the benefits of two bikes from the same is that it eliminates oddities, and aberrations. Both KTMs the same basic suspension, geometry, shock linkages, wheels and overall design. the 250SX and 250SXF differ in two areas. (1) Spring rates: The and fork spring rates are on both bikes.

Amazingly, is a non-issue, since both spring rates are wrong the factory— making mods on both machines. (2) Engine One bike has a 250cc two-… and one has a 250cc four-… engine. The is fuel injected, has a six-speed and comes with an electric The two-… has a Keihin PWK carb, speeds and a kickstarter.

Because of the in engine size and shape, the frame rails are specifically to arc around the engine’s cases, and the clearance is greater on the two-….

and power valves.

Q: WHAT DO WEIGH? WHICH ONE IS LIGHTER?

A: the MXA wrecking crew tested the KTM 250SX two-…, we were to discover that it weighed 217 Why? Because last no-link, PDS equipped 2011 KTM hit the scales at 212 pounds.

Where did the 5 pounds come from? It from the longer shock, linkage, linkage bolts and shock tower.

We were by the 5-pound weight gain, but it out that 5 pounds is nothing. The svelte KTM 250SXF four-… is a tub of It hit MXA ’s scales at 231 pounds. This used to come in at under 220 No more!

The addition of rising-rate fuel injection and electric piled on the pounds. The 2012 KTM two-… weighs 14 pounds than the 2012 KTM 250 four-…. It a little to compare the KTM 250SX against the Japanese 250 four-strokes, but it is 7 pounds lighter than an and KX250F, 5 pounds lighter a CRF250 and 1 pound lighter a YZ250F (the YZ250F is because it still has a carburetor).

KTM 250SXF . With the exception of the and exhaust, the KTM four-… shares the majority of its components with the KTM geometry.

Q: WHICH BIKE THE MOST HORSEPOWER?

A: No need to The KTM 250SX two-… pumped out horsepower in MXA ’s dyno runs. The KTM could only produce a 35.5 horsepower. You don’t us to do the math—but we will.

The two-… 14 horsepower more.

KTM 250SX: the two-… makes more a quick glance at where the and 250SXF produce their will reveal why they are equal once in motion.

Q: DO THE TWO POWERBANDS LOOK LIKE ON THE CURVE?

A: To make the dyno understandable, we will present in rpm increments.

5000 rpm: At rpm, the 250SX two-… 21.61 horsepower, while the four-… produces 12.85

6000 rpm: One thousand rpm the 250SX two-… is at 30.86 while the 250SXF has climbed to horsepower.

7000 rpm: The KTM cracks the 40-horse mark at rpm ( 40.03 horsepower). The four-… is at 24.50 ponies.

8000 The 250SX two-… is closing in on its horsepower. It makes 49.63 at 8000 rpm and peaks out at 49.77 at 8300 rpm. The four-… is still 2000 rpm below its and produces 29.13 horsepower at grand.

9000 rpm: the two-… is on the downside of its peak, it is pumping out 43.87 horsepower to the four-…’s 32.46 horses.

rpm: The two-… signs off at 10 makes 19.25 horses going to zero at 10,100 The 250SXF four-… is still 800 rpm peak. It makes 33.93 at 10,000 rpm.

11,000 The four-…’s peak is at 10,800 rpm ( ), and at 11,000 rpm, it is in the meat of the at 35.15 . The 250SX two-… is not any horsepower at this rpm

12,000 The 250SXF is still meaty at horsepower.

13,000 rpm: the rev limiter set at 13,500 rpm, the is still making a healthy horsepower at 13,000.

Q: WHICH MAKES THE MOST TORQUE?

A: There is an old saw that states horsepower doesn’t matter as as torque. It is assumed that four-strokes typically produce a of torque, they have an over two-strokes. Guess Sherlock! A KTM 250SXF four-… is no at 19.42 foot-pounds of torque at rpm.

That is a healthy but it pales in comparison to the 250SX’s foot-pounds of torque at 8000 rpm close to peak horsepower at

Q: WHICH BIKE HAS THE BEST

A: Although the displacements of the KTM 250SX and SXF are the the powerbands are horses of different

KTM 250SX two-…: The KTM 250SX has a distinct powerband (as evidenced by its numbers). It hits hard in the and pulls across a relatively range for a two-…. It tops 30 at 6000 rpm and stays above until dropping below 30 at 9800 rpm. By four-… the power is peaky, snappy and but the two-…’s power is harnessed in a way magnifies an all-out … in the part of the powerband.

It doesn’t rev 10,000 rpm, but it doesn’t to, because it gets the job done at an 8300 rpm. From to 9400 rpm, the KTM two-… more power than the KTM 250 In fact, there are points the 250SX’s dyno curve it makes as much as 19 horsepower than the four-… ever of producing.

The 2012 KTM 250SX is the two-… engine ever

KTM 250SXF four-…: Every rider who got off the KTM 250SX two-… and on the KTM four-… laughed out loud comparing the power. “The blows the four-… away” was the refrain. In test starts, the riders would let the four-… go blasting past it in 100 feet. In races against the KTM 250SX, the KTM engine felt slow.

It slower. It had less hit. It when the two-… went

But, and this is a big but, the four-…’s hit was less pronounced, was no wheelspin and no wiggle under The slow feel of the KTM 250SXF was The lack of the sensation of speed indicative of a lack of speed on the

The 250SXF may have been 10, 15 or 20 horsepower at various stages of the but after 10,000 rpm, the was down 30 horsepower to the four-…. the 250SXF lacked in ponies, it up in rpm. The four-… revved rpm further than the two-…, and those 3000 rpm, it was broad, usable and tractable

The 13,500 rpm rev limiter is 3500 rpm and wider than the two-…’s spread.

No need to worry stopping, KTM’s 260mm brake is the best in the biz.

Q: ONE IS EASIER TO RIDE?

A: The four-… is easier to ride—in the same way the family station wagon is to drive to the store than Force’s funny car. The makes the rider work It jerks, tugs, pulls and on the rider’s arms and chest. It action to get a reaction. The four-… need to have its throat out to generate speed.

It is like the engine that could. It goes without much or thought.

Q: WHICH ONE IS FASTER?

A: is a caveat that must be going fast isn’t about sheer horsepower. said, in perfect conditions, will always win. In speed, the KTM 250SX two-… can run around the KTM 250SXF four-….

motocross doesn’t take in a straight line. It is not the same as racing—which is why John Force won any AMA Nationals. In motocross, cumulative is worthy of note.

The arrangement of offcambers and tricky dirt often favor the tortoise the hare. Thus, while the is faster in an empirical sense, it always faster over a distance.

Expansion chamber.

Q: BIKE PRODUCES THE BEST LAP

A: We’ve done this before with a Yamaha two-… and Yamaha YZ250F So, we had an inkling of what the results be. We took three test (Pro, Intermediate and Vet) and their lap times on both

We did not do practice laps or test Instead, we did race laps the times taken directly transponders during actual Why?

Because we wanted the riders to give it their a chance to coast or look

We spent a couple race swapping bikes and test to get enough laps to prove one fact: if a rider can turn in a lap time on a 250 two-…, he can turn the time on a 250 four-…. Motocross must have internal typically referred to as “talent,” determine how fast they are of going. A faster bike necessarily make them

The only statistically significant was that all three test did their fastest laps on the KTM 250SX two-…. There sections on every racetrack an extra 14 horsepower could milliseconds off short straights and hills. That said, the laps of all three test were also clocked on the

Why? The two-… demands the attention. It was easy to get that fire breather to spin its tire, get sideways or wheelie at moments.

Every test knew which lap was his slow because he typically scared enough to burn it into his

Q: WHICH BIKE PRODUCED THE RACE RESULTS?

A: Every MXA rider had preconceived notions their races. They all that on hard tracks lots of corners that the would win the races, while and loamier track would the two-….

They weren’t but they failed to take one factor into account: the Whether the track was hard or long or short, the two-… always got a better start the four-…. You don’t need to be Holmes’ younger brother to out that you will win more from the front than the back.

On overall results, the was better than the four-…. the 250SX two-… did not turn a rider into a winner, nor did the four-… make him a loser. The empirical data that from our tests is that a wide spectrum of races, the rider on a two-… finished than he did on the four-…—though not significantly

And, most of the advantage from the start.

Head

Q: WHAT CONDITIONS FAVOR BIKE?

A: In hardpack conditions, traction was limited, the KTM 250SXF had the hand. The same was true in and hard, smallish, close-together The steady throttle approach of the KTM four-… made the bike up better in tricky situations. the dirt was good, there was a lot of the hills were steep and the were big the KTM 250SX two-… was a superior machine.

It could explode out of the soft that bogged down the

Q: WHICH BIKE HAS THE BEST

A: Most MXA test riders the handling of the KTM 250SX two-… that of the 250SXF four-…. It be remembered that these share the same head wheelbase, suspension system and The two-… gets the nod because it is lighter and feels even than it really is. Plus, the response of its two-… powerband and the of decompression braking under make it more responsive to conditions.

The two-… is more to make quick direction go in deeper and switch lines on a

Q: WHICH BIKE HAS THE BEST

A: Given that the suspension are identical—and the setup is identically from the factory—the best is on the bike that is 14 pounds

Q: WHAT’S THE FINAL WORD?

A: pulling any punches, every MX A thought that the 250SX was a better race bike—lighter, cheaper, better handling and to maintain. Yet, we would be the to admit that a two-… for everyone. It takes, as Roger noted, more talent to a two-…. It places greater on the rider’s reflexes, instincts and

The two-…’s greatest strength in its obvious list of superlatives, but the simple fact that it the intensity of racing more the same displacement four-….


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