2016 KTM Two-Stroke SX First Looks

May 19, 2015
Adam Booth
By Adam Booth
Off-road Editor|Articles|Articles RSS Enjoying single track in the mountains, hitting the motocross track or battling an EnduroCross track, if it's on two wheels Boothy will have a smile on his face. Adam has served a mega ton of years in the off-road industry as a photographer, writer and popper of wheelies.
KTM continues to push two-stroke technology, helping the future thanks to its outstanding power-to-weight ratio, low cost and simplicity. For 2016 the 125 SX and 150 SX received major overalls, dropping weight and adding power. The 2016 250 SX received minor revisions but stays much the same as the 2015 model.

2016 KTM 125 SX Two-Stroke

The newly developed 125cc engine for 2016 is nothing like the 2015 powerplant. It features a completely new architecture using the latest KTM engineering and technology. The new KTM 125SX engine is said to produce better power throughout the rpm range, is more compact and is an impressive 4.4-pounds lighter. The new engine now lives in the same chassis as the 2016 4-Stroke SX-F line.

Highlights and Changes
• New 125 SX engine is more compact, is 4.4-pounds lighter and has more power
• New cylinder with revised ports and newly designed power valve unit with a sophisticated mechanism for the lateral exhaust ports increases performance throughout the rpm range
• A new piston optimized for maximum reliability with the new cylinder layout
• Lighter crankshaft optimally balanced for minimum vibrations. All-new die-cast engine cases raise the crankshaft and clutch shaft, centralizing mass and improving handling
• New 6-Speed transmission provides the same gear ratios as before but is lighter and narrower
• New “No Dirt” shift lever prevents dirt from fouling the lever joint to ensure proper shifting in any condition
• New exhaust pipe tuned specifically for the 125SX for maximum power output from the new engine
• A lighter chromoly steel frame provides higher torsional rigidity with less longitudinal stiffness for improved handling and energy absorption
• A smaller and lighter subframe design saves weight.
• The swingarm features a revised internal structure to match the new frame characteristics and is lighter
• New CNC machined upper triple clamp featuring a rubber damping system for the new Neken handlebar and ODI lock-on grips
• The WP 4CS (Four Chamber System) fork specifically designed for motocross and features revised damping settings optimized for the new chassis
• New generation WP shock developed in conjunction with the new frame and swingarm architecture including a new linkage/pullrod system
• Super lightweight Galfer Wave rotors, CNC machined hubs, high-end Excel rims fitted with Dunlop GEOMAX MX32 tires are standard equipment
• New airbox and air filter design offers maximum protection for the engine while ensuring maximum airflow and providing quick “no tools” air filter changes
• New ergonomics and bodywork centralize mass

KTM 125 SX Two-Stroke
Engine: Single Cylinder, two-stroke
Displacement: 124.8cc
Bore x Stroke: 54.0 x 54.5mm
Starter: Kickstarter
Transmission: 6 Gears
Fuel System: Keihin PWK 38S AG Carburetor
Lubrication: Premix 40:1
Primary Ratio: 23:73
Final Drive: 13:50
Cooling: Liquid-cooling
Clutch: Wet Multi-Disc Clutch, Brembo Hydraulics
Ignition: Kokusan
Frame: Central Double-Cradle Type 25CrMo4 Steel
Front Suspension: WP Suspension USD 4860 MXMA 4CS
Rear Suspension: WP Monoshock 5018 BAVP DCC with Linkage
Suspension Travel Front/Rear: 300mm/11.81 inch; 300mm/11.81 inch
Front/Rear Brakes: Disc Brake 260mm/10.24 inch; 220mm/8.66 inch
Front/Rear Rims: 1.60x 21, 2.15 x 19 Excel
Front/Rear Tires: 80/100-21, 100/90-19 Dunlop MX32
Wheelbase: 58.5 inch
Ground Clearance: 14.8 inch
Seat Height: 37.8 inch
Tank Capacity: 1.9 gallon
Weight (without fuel) Approx: 196.7 pounds

2016 KTM 150 SX

The 150 SX promises the agility of a 125 but with more power and torque. For 2016 an all-new, lighter engine produces more pop and sits in a totally new chassis, making the 150 even stronger and lighter than before. The 125 SX and 150 SX are virtually the same bike, separated by cubic centimeters.

Highlights and Changes
• New 150 SX engine is more compact, weighs four pounds less and has more power
• New cylinder with revised ports and newly designed power valve unit with a sophisticated mechanism for the lateral exhaust ports improves performance over the entire rpm range
• A new piston optimized for maximum reliability with a reworked shape to fit perfectly with the new cylinder layout
• Lighter crankshaft optimally balanced for minimum vibrations
• All-new die-cast engine cases raise the crankshaft and clutch shaft, centralizing mass and improving handling
• New 6-Speed transmission provides the same gear ratios as before but is lighter and narrower
• New exhaust pipe has been tuned for the 150 SX specifically to get maximum power output from the new engine
•New “No Dirt” shift lever prevents dirt from fouling the lever joint to ensure proper shifting in any condition
• New lighter Chromoly steel frame provides higher torsional rigidity with less longitudinal stiffness resulting in improved handling and energy absorption
• New smaller, lighter subframe design made with new aluminum profiles
• New lighter swingarm features a revised internal structure to match the new frame characteristics
• New lighter “No Dirt” footpeg design that provides a larger surface area and features a “scraper” to reduce dirt build-up in the hinge
• New CNC machined upper triple clamp featuring a rubber damping system for the new Neken handlebar and ODI lock-on grips
• The advanced WP 4CS (Four Chamber System) fork has been specifically designed for motocross and features revised damping settings optimized for the new chassis

KTM 150 SX Specifications:
Engine: Single Cylinder, two-Stroke
Displacement: 143.99cc
Bore x Stroke: 58 x 54.8mm
Starter: Kickstarter
Transmission: 6-speed
Fuel System: Keihin PWK 38S Carburetor
Lubrication: Premix 40:1
Primary Ratio: 23:73
Final Drive: 13:50
Cooling: Liquid-cooling
Clutch: Wet Multi-Disc Clutch, Brembo Hydraulics
Ignition: Kokusan
Frame: Central Double-Cradle Type Steel
Subframe: Aluminum
Handlebar: Neken, Aluminum 22mm
Front Suspension: WP 4CS
Rear Suspension: WP Monoshock with Linkage
Suspension Travel Front/Rear: 11.81 inch /11.81 inch
Front/Rear Brakes: Disc Brake 260mm/220mm
Front/Rear Rims: 1.60x 21, 2.15 x 19 Excel
Front/Rear Tires: 80/100-21, 100/90-19 Dunlop MX32
Chain: 5/8 x 1/4 inch
Silencer: Aluminum
Steering Head Angle: 26.1º
Triple Clamp Offset: 22mm
Wheelbase: 58.5 ± 0.4 inch
Ground Clearance: 14.8 inch
Seat Height: 37.8 inch
Tank Capacity: 1.9 gallon
Weight (without fuel): Approx: 196.7 pounds

2016 KTM 250 SX Two-Stroke

For 2016 the 250 SX features detail improvements and new colors and graphics, but retains the same chassis and engine specifications as the proven 2015 250 SX.

Highlights and Changes
• New CNC machined triple clamp with 22mm offset and new handlebar rubber damping system for reduced engine vibrations to the rider for less fatigue
• Wheels now have new lighter spokes with a weight reduction of 100 grams.
• New generation Dunlop Geomax MX32 tires for improved traction and performance
• High-tech Brembo brakes with new lighter Galfer Wave rotors

2016 KTM 250 SX Specifications:
Engine: Single Cylinder, 2-Stroke
Displacement: 249cc
Bore x Stroke: 66.4 x 72.0mm
Starter: Kickstarter
Transmission: 5-Speed
Fuel System: Keihin PWK 36S AG Carburetor
Lubrication: Premix 60:1
Primary Ratio: 26:72
Final Drive: 13:48
Cooling: Liquid-cooling
Clutch: Wet Multi-Disc DDS-Clutch, Brembo Hydraulics
Ignition: Kokusan
Frame: Central Double-Cradle Type Steel
Subframe: Aluminum
Handlebar: Neken, Aluminum 22mm
Front Suspension: WP 4CS
Rear Suspension: WP Monoshock with Linkage
Suspension Travel Front/Rear: 11.81 inch/2.48 inch
Front/Rear Brakes: Disc Brake 260mm/ 220mm
Front/Rear Rims: 1.60 x 21, 2.15 x 19 Excel
Front/Rear Tires: 80/100-21, 110/90-19 Dunlop MX32
Chain: 5/8 x 1/4 inch
Silencer: Aluminum
Steering Head Angle: 26.5º
Triple Clamp Offset: 22mm
Wheelbase: 58.5 ± 0.4 inch
Ground Clearance: 15.15 inch
Seat Height: 39.1 inch
Tank Capacity: 1.9 gallong
Weight (without fuel): Approx: 211.4 pounds