MXA’S 2014 KTM 125SX MOTOCROSS TEST: RELEGATED TO THE JUNK HEAP OF PRO…

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KTM 125 SX

MXA’S 2014 KTM 125SX TEST: RELEGATED TO THE JUNK OF PRO RACING, IT IS AT THE TOP OF THE FUN FACTOR 1-2-5

Step on a scale, then add weight to the age you will be on your birthday. If the number is greater 160, look for another to ride

Q: FIRST AND FOREMOST, IS THE KTM 125SX BETTER THAN THE KTM 125SX?

A: The easy answer is no. of the changes that KTM made to the 125SX were chassis, or cosmetic changes.

Q: WHAT A 2014 KTM 125SX COST?

A: The price of the KTM 125SX is $6499. is $100 cheaper than a KTM $700 cheaper than a KTM two-… and $1500 cheaper a KTM 250SXF four-….

2014 KTM A few years ago KTM stopped importing 125 because KTM 150SX sales 125SX sales, but consumer convinced KTM to bring them in Good call.

Q: WHAT ARE THE SPECS ON THE 2014 KTM 125SX?

A: The specs are as follows:

Displacement: (7.6 cubic inches)

and …: 54mm by 54.5mm

Six-speed

Gearing: 13/50

38mm Keihin PWK

Frame: steel (ovalized)

Head 63.5 degrees (26.5

Brakes: 260 (front), 220mm Brembo master cylinders

Aluminum drive plates, for two steel plates in the middle of the pack.

Q: WHAT CHANGES DID KTM TO THE 2014 125SX ENGINE?

A: is really only one significant After a couple years of Moto Tassinari VForce for 2014, KTM switched to Boyesen RC2 carbon fiber reed housed in a KTM-designed reed We use the word “designed” loosely because the KTM reed block the VForce with its twin Vs and petals.

As a word of note—we to have issues with the (too lean), cranks to seize) and the cylinder heads actually broke into but over the last five KTM has done a good job of fixing all of our old

Q: WHAT ELSE IS NEW ON THE 2014 KTM TWO-STROKE?

A: Do you know the difference a model-specific update and a brand-specific Model-specific changes are ones are introduced only on one model, jetting specs or ignition selected for one machine. Brand-specific are modifications that are done to bike in the product line.

were five brand-specific on every 2014 KTM, and are as follows:

(1) Front brake. the front master cylinders on the 150SX, 250SX, 250SXF, and 450SXF got new front-brake reservoirs, levers and smaller-diameter pistons from 10mm to 9mm), the and 150SX are the only Katooms using Magura hydraulic (the rest have clutches).

(2) Seat foam. The core of the saddle has been to be softer initially but not break as quickly—at least that’s the brochure says.

(3) Gas cap. The threads on the gas cap have been for more positive engagement, and the gas cap has a new shape—it doesn’t stick up as as last year’s cap.

(4) KTM lightened the chain guide by 120 and beefed up its swingarm brackets.

(5) For 2014, the graphics on the shrouds, cover and side winglets are in-mold decals.

Hanger on: The silencer bracket is awesome.

Q: THE DIFFERENCE BETWEEN A 125SX AND A

A: In essence, the KTM 125SX and 150SX everything save for the obvious parts. Here is the list:

(1) The 150SX is a 143.6cc. The 125SX is

(2) Bore and …. The 150SX and … is 56mm by 58.4mm, the 125SX is 54mm by 54.5mm.

(3) Gearing. The 150SX comes 13/48 gearing, while the gets 13/50.

(4) Parts. The cylinder, piston, power and rings are different on the 125SX and

(5) Clutch . The 150SX uses all drive plates, while the uses aluminum drive except for two steel plates in the of the clutch pack. The 150SX has stiffer clutch springs.

(6) Last year, the 125SX and 150 the same jetting specs. year, the mainjet, pilot, and clip position are all different.

Q: HOW IS THE 2014 KTM 125SX?

A: Given 125cc two-strokes have the horsepower of any full-size motocross they are at a disadvantage in deep big jumps and head-to-head races bigger engines. Yet, isn’t the be all, end all of motocross, is why you occasionally see a Vet on a 125 two-… run down a of 450-mounted competitors. Still, in cases, there is no replacement for

Given that scenario, you to wonder why every MXA test preferred to race the 125SX of the much more powerful Their answers to that were telling: “The 125 is more fluid.” “It carries its better from gear to “It’s not faster in a drag but it can go faster from corner to

On the dyno, the 125SX peaked at horsepower. That is a very number for a 125 tiddler, but in a world by 40-plus-horsepower 250 four-strokes, that deficit translates into starts against 250Fs.

Q: WHO IS THE AUDIENCE FOR THE KTM 125SX?

A: The 125SX is for a rider fresh out of the minis who a bike that is light to pick up if it falls over, enough to race on a budget, enough to repair in the garage and enough to have fun on. In all honesty, MXA test rider who has kids, Larry Brooks to Lars to Alan Olson, made offspring spend a season or two on a 125 Why?

They believed that the needed to navigate a track on a 125 would teach their more about riding 10 years on a four-…. They Junior to learn throttle how to shift, what a clutch is the best ways to carry and how to make smart strategic They felt that kids would learn the better on a bike that had to be to the nth degree.

Sadly, most don’t have the money to buy a that is just a stepping to the 250 four-…. Plus, they want little Johnny to be at a in the 250 Novice class. That fact means that the buyer of a 125cc two-… is a whose local racetrack has a 125 two-… class.

The truth of the is that a 125 is only competitive another 125, given talented riders.

Clicker: See the It doesn’t have a good

Q: WHAT MODS SHOULD KTM 125SX RACER MAKE?

A: the young and neophyte nature of the 125 we don’t think that it is to spend a bundle hopping up a 125 Given our druthers, we would the money for new pistons, tires and plates.

What would we money on? We would swap the sprocket for a one-tooth-larger rear cog even think about two teeth for tight, Supercross-style Aftermarket exhausts aren’t to make a KTM 125SX blow by a on the track, but they will the powerband and make the bike to keep on the pipe.

Although we running race gas in the Novice is a waste of money, we are still picky about what we run in the KTM based on previous bad experiences. We run 91-octane pump gas with a of VP C12 added as a precaution.

Warning: Check the spokes and the rims will last.

Q: DID WE HATE?

A: The hate list:

(1) ring. We don’t get it. Preload should be made of the hardest known to man, not gummy

(2) Rims. The telltale sign of a rim is a loose spoke next to the rim The rims are cheap and exhibit chintziness at the spoke nipples. them constantly.

(3) Gearing. The gearing is best suited to the Salt Flats.

(4) Seat It gets softer with ride—and it isn’t all that to begin with.

(5) Forks. You be doing something wrong to 125 forks feel harsh.

(6) Gas cap hose. KTM’s vent gets twisted in a knot you remove the cap. We drill a in the fork steering-stem cap to slip the hose into it or order a Connection stem cap hat has the hole in it.

With the vent hose in the of the steering stem the vent can spin with the gas cap.

Fun one-two-five: Thanks to its tiny modest horsepower, light and all-or-nothing throttle demands, the KTM is a thrill ride.

Q: WHAT DID WE

A: The like list:

(1) Weight. At 206 it is 18-pounds lighter than the 250 four-….

(2) Front brake. 260mm Braking rotor and caliper can bring the 240-pound to a screeching halt, so imagine it can do to a featherweight two-….

KTM 125 SX

(3) Hydraulic Honda, Yamaha, Suzuki and owners don’t know they are missing. Although the is a little different, the clutch last three times than on a cable-controlled unit

(4) Four-strokes have many parts and, as a function of pricing, you pay extra for each Since a two-… has fewer you pay less.

Plus, you can do all the maintenance on a two-… by yourself with a butter and a nutcracker.

(5) Cosmetics. KTM’s plastic cladding design and graphics are attractive.

(6) Silencer. We the nylon hanger bracket KTM uses to hold the silencer to the Super cool.

Q: WHAT DO WE THINK?

A: Here is an easy quiz. Step on a scale, add your weight to the age you will be on next birthday. If the number is than 160, look for bike to ride.

A 125cc is a starter bike designed to the gap between minicycles and big bikes. It is a learning tool.

MXA’S KTM 125SX SETUP SPECS

is how we set up our KTM 125SX for racing. We offer it as a to help you find your own spot.

WP FORK SETTINGS

We like these forks—never and it’s beginning to look we never will. The big change for is to switch from last softer 0.42 Nm fork to stiffer 0.44 Nm springs. The springs should have the forks to be set up plusher, but that happen. These forks are harsh.

Most MXA test prefer to lower the oil height by 10 to to try to improve the feel through the Here’s what we ran in our 125SX stock settings are in parentheses):

rate: 0.44 Nm

Compression: 12 out

Rebound: 12 clicks out

Oil height: (360cc)

Fork-leg height: 5mm up

Since most of the 125SX’s issues are valving related, we have the forks revalved by Pro MX1 or MX-Tech.

Featherweight: The shock is set up for fat-deficient people.

WP SHOCK SETTINGS

KTM made no linkage or spring-rate changes to the KTM 125SX models. Here is we ran (stock settings in parentheses):

rate: 4.8 Nm

Hi-compression: 2 turns out

15 clicks out

Rebound: 15 clicks out

sag: 100mm

Notes: that the 125SX and 150SX the same suspension system as the 350SXF and 450SXF, and the four-strokes run 5.4 to 5.7 Nm springs, you can see that the 125SX’s 4.8 Nm shock spring is designed for in the 150-pound range. If you are heavier that, you will need to go on the shock spring.

KEIHIN PWK 38S SPEC

MXA has always felt the 125SX ran lean—so lean we upped the mainjet from the 182 to a richer 185. Conversely, we out the richer 42 pilot and put in a leaner 40. is more art than science, and in our it is better to play it safe the KTM 125SX jetting than to go for

Here’s what we ran in our 38mm PWK settings are in parentheses).

Mainjet: 185

Pilot: 40 (42)

Air screw: turns out

Notes: For comparison the 2014 KTM 150SX comes a leaner 180 main and a richer, N1EJ needle. We prefer to it safe with a richer and the needle way up.

KTM 125 SX


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