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You are here: TMW -- 2017 Motorcycle Models -- KTM -- 2017 KTM 125 SX Review

2017 KTM 125 SX Review
Back to the 2017 KTM Motorcycle Model Review Page

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2017 KTM 125 SX
2017 KTM 125 SX

2017 KTM 125 SX
2017 KTM 125 SX



2017 KTM 125 SX Review

2017 KTM 125 SX on www.Totalmotorcycle.com

Sting Like a Bee...

The whip cracking KTM 125 SX has been at the front for years. With the phenomenal performance on tap, it will be there for many more seasons to come. A compact chassis and the lowest weight out there is teamed up with a high performance 125cc 2-stroke engine for a surefire trophy collection. Get shredding, youngsters.

 



2017 KTM 125 SX www.Totalmotorcycle.com Key Features

UPGRADE: KTM SX MODELS MODEL YEAR 2017 ARRIVING IN DEALERS SOON!

After last year’s new generation of SX machine was launched with revolutionary WP AER 48 forks, a new chassis, plus new engines over previous models (except 250 SX), the KTM R&D departments in Austria and the USA have been making further improvements for 2017, and updated the 250 SX model to the latest specification of chassis with a brand new engine.

With input from the KTM Motorsports department being influential to serial production, especially in the USA where the factory team must race homologated machines and we can note that Ryan Dungey has just won back-to-back 450 Supercross World Championship titles aboard a KTM 450 SX-F, the SX model line-up is better than ever.

With typical KTM characteristics including a precisely designed, high-tech lightweight chrome-moly steel frame, high-tech Brembo brakes, lightweight CNC machined hubs with high-end Excel rims, Dunlop Geomax MX 3S tires, No-Dirt footpegs, an intelligent air filter box system, precisely designed bodywork, the all important starter (except 125 SX) and much, much more already fitted to these machines, KTM has once again reached new heights with the latest model range. For 2017 there are a number of refinements over last year including traction control for 4-stroke models, which is part of the new multifunctional handlebar map switch, new suspension components and settings, new graphics and other exciting details.

New for 2017 is:
• All new 250 SX model
• New multi-functional handlebar map switch so the rider can activate the new traction control and launch control, while choosing an alternate mapping of the engine management system
• Re-designed upper triple clamp for enhanced fork action
• New shock absorber setting for increased rider confidence
• Air pump supplied as standard for the AER 48 fork system
• Hourmeter to help keep up with precise maintenance
• Re-designed outer tubes on AER 48 forks for enhanced flex characteristics for reduced stiction and less friction, as well as a weight reduction of 265 g
• New graphics
• New seat cover that provides a better feel and grip for the rider
• New resonator system for 450 SX-F with flow design header plus a new 250 SX exhaust system
• New aluminum cylinder head stays on the engine mounts for 4-stroke SX models

Joachim Sauer (KTM Offroad Product Manager): “Last year was a new generation of SX, but we’ve been back through every component of each motorcycle in this range and as always we’re looking how we can do things better. There are some significant changes in the SX MY2017 line-up to benefit the rider both on and off the bike, as well as a brand new 250 SX! Obviously we have a lot of input from Motorsports, which is especially key to these steps forward and it’s great we can boast another FIM Supercross World Championship title in the hands of Ryan Dungey. The appetite for improvement never stops in our R&D department and we feel that riders will certainly benefit from the refinements made for 2017.”


 

2017 KTM 125 SX www.Totalmotorcycle.com Features and Benefits

LOOKS THAT MATTER


BODYWORK

KTM R&D, Kiska Design and the factory racers had their say in shaping the plastics with one goal: complete harmony between rider and bike. Perfect ergonomics and contact points provide maximum comfort in movement on the SX-F. The I-beam structures of the front and rear fenders guarantee maximum stability and a low weight thanks to well thought-out construction and mounting. They also stay cleaner for longer.

GRAPHICS

New graphics convey the READY TO RACE character of the 2017 SX-F model line.


SLEEK & SLICK


87.2 kg

FRAME

The high-tech, lightweight chrome-moly steel frame is engineered for excellent handling, precise cornering and supreme stability. You can also count on high torsional rigidity and low longitudinal stiffness for better absorption of the energy created by the front and rear suspension sucking up jumps and bumps. In short: more comfort and less rider fatigue. Laterally attached, lightweight engine head stays contribute to a reduced vibration level. The engineers were able to pull off all that, while making the frame two pounds lighter than that of the lightest competitor on the market. In addition, the frame is easier to maintain, easier to work on and supplies more space for the tank and other components. The bike also features an extra-light aluminum subframe, which weighs in at less than 2 pounds.

FOOTPEGS

Sophisticated ´No Dirt´ footpegs prevent clogging of the footpeg pivot, even when digging in deep ruts. Looking for a higher riding position. Then just mount the footpegs of the MY2017 EXC models, which are 6mm higher than the SX versions.

AIRBOX

The airbox design offers maximum protection of the air filter while ensuring maximum airflow. The large twin-air filter is mounted in a stiff cage, which at the same time holds the system in place. This design is so simple you could still pop a fresh one in with a face full of mud. Without tools. In seconds.

HANDLEBAR

KTM engineers sure know how to handle handlebars. This tapered one, made of high-strength aluminum by NEKEN, is fixed in damped rubber mounts and has two different positions. From 2017 onwards, the lower handlebar clamps are separated, while on the upper side a new bridge-type clamp guarantees more torsional stiffness. It’s also easier to replace the bar in case it gets twisted in a nasty crash. ODI lock-on grips make grip changes easy which does not require any wire or glue to be secured.

SWINGARM

The cast aluminum design offers low weight and a perfect flex behavior. The single-component casting process eliminates any inconsistencies and inherent weak points created by welding. It’s better looking as well.

FUEL TANK

A lightweight polyethylene tank has a capacity of 1.85 gallons. The filler cap has an inside thread, which makes for easy and reliable closure.

WHEELS

Featuring lightweight, CNC machined hubs and high-end Excel rims, they guarantee maximum stability and minimal unsprung weight. The wheels are shod with the latest Dunlop Geomax MX 3S tires.

SEAT

Featuring lightweight, CNC machined hubs and high-end Excel rims, they guarantee maximum stability and minimal unsprung weight. The wheels are shod with the latest Dunlop Geomax MX 3S tires.

COOLING SYSTEM

KTM’s proven cooling system routes the coolant from the cylinder head through the frame triangle, directly to aluminum radiators made by WP. A new filler cap system and are stiffer alloy construction increase the durability and reliability of the cooling system. Due to flow optimized internal circulation and CFD-calculated air ventilation, the system is superbly efficient. In addition, well thought-out radiator guards integrated in the front part of the shrouds provide protection in a crash.


SMALL BORE, BIG POWER


ENGINE

The latest 125 SX engine is the most powerful and most competitive engine in its class; a clear statement that KTM is keen on keeping 2-stroke technology at the forefront of development. The secret to their success is an outstanding power-to-weight ratio, low costs and simplicity. This 125cc ripper has been developed with the latest KTM engineering know-how and the most advanced technology available. The results: class-leading power across the rev range, while being extremely compact and ultra-light at a mere 38 pounds. Our work here is done; now it’s up to you to collect the trophies.

CYLINDER

This compact cylinder with a 54mm bore features a cutting-edge power valve unit with a sophisticated mechanism for the lateral support exhaust ports. Matched to a twin-component cylinder head, it is KTM’s secret to all-round grunt. The layout of the water jackets in the cylinder and head guarantees efficient heat dissipation when the going gets tough.

ENGINE CASES

For the latest engine generation the KTM engineers designed lightweight die-cast engine cases featuring a high crankshaft position located close to the center of gravity, which results in optimal mass centralization and outstanding rideability. In addition, the engine is extremely compact while still able to house an optional electric starter.

CRANKSHAFT

This reliable piece of engineering has been skillfully balanced to guarantee minimal vibrations. In its latest form, it allows an increase of the displacement to 144cc just by replacing cylinder, piston and head. There’s no longer the need to change the crankshaft if you want to change displacement. Two-in-one in no time.

TRANSMISSION

A robust 6-speed transmission was designed specifically for the small 2-stroke engine, its gear ratios are perfectly in sync with the 125’s power band. The latest production technologies allow for compact dimensions and minimal weight. An advanced ´No Dirt´gear lever design prevents mud from clogging the folding tip for reliable shifts even in the worst conditions.

CARBURETOR

As of model year 2017, all KTM 2-stroke models are fitted with new MIKUNI TMX carburetors, replacing the Keihin products. This 38mm flat slide carb lives to provide smooth and controllable power all the way up to the limit. And it’s less sensitive to different altitudes and temperatures, so you can pin it wherever, whenever.

EXHAUST

The engineers meticulously tuned the expansion chamber for maximum torque and power, so this screamer is as tough as it is strong.


YOU CAN HANDLE IT


MONOSHOCK

The WP monoshock has been developed with the entire frame and swingarm architecture in mind, including the linkage system and the WP AER 48 front forks. It features machined and black anodized components and is a valuable, high-end product compared to roughcast reservoirs. A new setting and a softer spring perfectly match the reworked front-end set-up and its sparkling WP color scheme lets everyone know you have excellent taste in suspension.

FORKS

The lightweight WP AER 48 front fork, a 48mm USD air-sprung fork developed by WP in close collaboration with KTM, is a split fork with separate functions for each leg. That means damping functions are on the right side, whereas the air spring is in the left. This left leg features a two-chamber system with a capsuled air cartridge to prevent loss of air pressure. The air spring is easy to adjust to any rider weight via a single air valve. No special tools are required; just the air pump provided with the bike. The right fork leg integrates a damping cartridge that tailors to all your damping needs. It can be adjusted to the track conditions and the rider’s preferences with a twist of a dial (compression from the top, rebound from the bottom, 30 clicks each). For 2017, the AER 48 also features redesigned outer tubes with better flex characteristics, smoother operation and less friction. And they are 3 pounds lighter than the 4CS units they replace. Right off the dealer floor, these forks are more comfortable and more sensitive than ever. But you can still hammer the hell out of them.

TRIPLE CLAMP

Top quality, CNC machined triple clamps have been a KTM trademark for years to ensure precise handling. For 2017, the upper triple clamp specifically features a redesign in conjunction with the new fork tubes. The rubber damped handlebar mount has also been reworked and the lower handlebar clamps are now separated, while on the upper side a new bridge-type clamp guarantees more torsional stiffness and can easily be replaced in case it gets twisted due to a crash. In addition, an hour meter is fitted at the upper triple clamp in order to let the rider know it’s time for a service.

BRAKES

You can’t brake any harder, better, faster or stronger. These high-tech Brembo babies are combined with lightweight wave discs made by Galfer. For 2017, the rear brake features a 10mm longer brake pedal and you get new, less aggressive brake pads all round.

 



 

2017 KTM 125 SX - www.Totalmotorcycle.com USA Specifications/Technical Details
US MSRP Price: $ See Dealer for Pricing in USD

Engine

Design

1-cylinder, 2-stroke engine

Displacement

124.8 cm³

Bore

54 mm

Stroke

54.5 mm

Starter

Kickstarter

Transmission

6-speed

Primary drive

1.009027778

Secondary gear ratio

13:50

Clutch

wet multi-disc clutch, Brembo hydraulics

EMS

Kokusan

Chassis

Frame design

25CrMo4 steel central-tube frame

Front suspension

WP-USD, AER 48, Ø 48 mm

Rear suspension

WP shock absorber with linkage

Suspension travel (front)

310 mm

Suspension travel (rear)

300 mm

Front brake

Disc brake

Rear brake

Disc brake

Front brake disc diameter

260 mm

Rear brake disc diameter

220 mm

Chain

5/8 x 1/4"

Steering head angle

63.9 °

Wheelbase

1485 ± 10 mm

Ground clearance

375 mm

Seat height

960 mm

Tank capacity (approx.)

7 l

Weight READY TO RACE (without fuel)

87.2 kg




 


 

2017 KTM 125 SX - www.Totalmotorcycle.com Canadian Specifications/Technical Details
Canada MSRP Price: $ See Dealer for Pricing in CDN

Engine

Design

1-cylinder, 2-stroke engine

Displacement

124.8 cm³

Bore

54 mm

Stroke

54.5 mm

Starter

Kickstarter

Transmission

6-speed

Primary drive

1.009027778

Secondary gear ratio

13:50

Clutch

wet multi-disc clutch, Brembo hydraulics

EMS

Kokusan

Chassis

Frame design

25CrMo4 steel central-tube frame

Front suspension

WP-USD, AER 48, Ø 48 mm

Rear suspension

WP shock absorber with linkage

Suspension travel (front)

310 mm

Suspension travel (rear)

300 mm

Front brake

Disc brake

Rear brake

Disc brake

Front brake disc diameter

260 mm

Rear brake disc diameter

220 mm

Chain

5/8 x 1/4"

Steering head angle

63.9 °

Wheelbase

1485 ± 10 mm

Ground clearance

375 mm

Seat height

960 mm

Tank capacity (approx.)

7 l

Weight READY TO RACE (without fuel)

87.2 kg




 

2017 KTM 125 SX - www.Totalmotorcycle.com European Specifications/Technical Details
Europe/UK MSRP Price: £5799 GBP (On The Road inc 20% Vat)

Engine

Design

1-cylinder, 2-stroke engine

Displacement

124.8 cm³

Bore

54 mm

Stroke

54.5 mm

Starter

Kickstarter

Transmission

6-speed

Primary drive

1.009027778

Secondary gear ratio

13:50

Clutch

wet multi-disc clutch, Brembo hydraulics

EMS

Kokusan

Chassis

Frame design

25CrMo4 steel central-tube frame

Front suspension

WP-USD, AER 48, Ø 48 mm

Rear suspension

WP shock absorber with linkage

Suspension travel (front)

310 mm

Suspension travel (rear)

300 mm

Front brake

Disc brake

Rear brake

Disc brake

Front brake disc diameter

260 mm

Rear brake disc diameter

220 mm

Chain

5/8 x 1/4"

Steering head angle

63.9 °

Wheelbase

1485 ± 10 mm

Ground clearance

375 mm

Seat height

960 mm

Tank capacity (approx.)

7 l

Weight READY TO RACE (without fuel)

87.2 kg

The illustrated vehicles may vary in selected details from the production models and some illustrations feature optional equipment available at additional cost.
All information concerning the scope of supply, appearance, services, dimensions and weights is non-binding and specified with the proviso that mistakes, printing, setting and typing errors may occur; such information is subject to change without notice.



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