KTM released more information on its 2018 line of motocross and off-road motorcycles today, and of course the one that most two-stroke fans have been waiting for is the 2018 KTM 250 XC-W TPI. Unfortunately, only the 250cc version will be available in the U.S. The 2018 KTM 300 XC-W TPI model will not, at least for now.
The “TPI” in the model’s nomenlature stands for transfer port injection, a patented EFI system that places the two injectors into the transfer ports of the cylinder. KTM claims that the injector placement solves the issues that have made fuel-injecting two-stroke dirtbikes such a challenge by allowing the desired smooth throttle response while also drastically reducing fuel consumption. KTM calls TPI “a global game changer in terms of technology. Gone is the hassle of jetting, premixing gas and difficult starting.”
The 2018 250 XC-W TPI’s technical highlights include:
• A new 249cc 2-Stroke engine fitted with a patented TPI fuel injection system designed for perfect fueling at any altitude, no premixing and reduced fuel consumption while still retaining the desired two-stroke performance.
• A new cylinder with two injectors placed in the rear transfer ports for optimal downstream atomization of fuel.
• A new EMS featuring a new ECU controlling ignition timing and fuel based on information from five sensors reading intake and ambient air pressure, throttle position, oil and water temperature to help optimize engine response.
• A new 39mm throttle body by Dell’Orto that features a butterfly valve controlled by a twin cable throttle.
• A new electronic oil pump that feeds oil from a 700cc oil tank to the intake to ensure the proper fuel-oil mix under any condition while reducing smoking by 50% for up to five tanks of fuel.
• An updated WP Xplor 48 upside-down split front fork with new outer tubes for more sensitivity, less stiction and reduced weight. The forks setting have been revised to make it feel stiffer.
• An updated WP Xplor PDS rear suspension that features stiffer settings.
• New radiator guards designed to provide better airflow in muddy conditions.
• Engine cases that feature a compact shaft arrangement for better mass centralization.
• A cylinder with a twin-valve-controlled power valve for smooth power that can be adjusted within seconds for different track conditions.
• A lateral counterbalancer that reduces engine vibrations and helps reduce rider fatigue.
• A six-speed wide ratio transmission.
• A hydraulically operated DDS clutch that features a damping system for better traction and durability.
• A lightweight Chromoly steel frame designed to provide high torsional rigidity with less longitudinal stiffness for improved handling and energy absorption.
• PDS Shock mounting geometry that is matched to the aluminum swingarm with a centered location for nearly symmetrical loads to the swingarm.
• Forged aluminum triple clamp with handlebar positions and a 22mm offset for precise handling.
• ODI grips that feature a lock-on design for the left grip and a vulcanized grip on the throttle side.
• A “No Dirt” footpeg design that is intended to keep the peg pivots from becoming clogged with debris.
• CNC-machined hubs, Giant rims and Dunlop tires.
• An airbox and filter design that allows for quick “no tools” air filter changes.
• Bodywork with ergonomics and contact points intended to provide maximum control and comfort.
• A 2.4-gallon see-through polyethylene tank.
• “No Dirt” shift lever prevents dirt from fouling the lever joint.
2018 KTM 250 XC-W TPI Specifications
Engine Type: Single Cylinder, 2-Stroke
Displacement: 249 cc
Bore/Stroke: 64.4 / 72 mm
Starter: Electric, Lithium Ion 12 V 2 Ah / Kickstarter
Transmission: 6 Gears, wide ratio
Fuel System: TPI, Dell’Orto 39mm Throttle Body
Lubrication: Electronically Regulated Oil Pump
Primary Ratio: 26:73
Final Drive: 13:50
Cooling: Liquid Cooling
Clutch: Wet Multi-Disc DDS Clutch, Brembo Hydraulics
Ignition: Synerject EMS
Frame: Central Double-Cradle Type 25CrMo4 Steel
Subframe: Aluminum
Handlebar: Neken, Aluminum Ø 28/22mm
Front Suspension: WP Xplor USD Ø 48mm
Rear Suspension: WP Xplor PDS Monoshock
Suspension Travel Front/Rear: 300 mm / 11.8 in; 310 mm / 12.2 in
Front/Rear Brakes: Disc Brake 260 mm; 220 mm
Front/Rear Rims: 1.60 x 21” / 2.15 x 18” Giant
Front/Rear Tires: 80/100-21” / 110/100-18” Dunlop GEOMAX AT81
Chain: 5/8 x 1/4 in
Silencer: Aluminum
Steering Head Angle: 26.5º
Triple Clamp Offset: 22 mm
Wheelbase: 1,482mm ± 10 mm / 58.3 ± 0.4 in
Ground Clearance: 370mm / 14.6 in
Seat Height: 960 mm / 37.8 in
Tank Capacity, Approx: 9 l / 2.4 gal
Weight (without fuel), Approx: 103 kg / 227 lbs
While the KTM 250 XC-W TPI is the wonderbike of the 2018 KTM line, the Austrian firm will still offer carbureted models across its off-road lineup, including the 2018 KTM 250 XC-W, 2018 KTM 300 XC-W and 2018 KTM 150 XC-W. The 250 XC-W and the 300 XC-W share mostly the same features, except that the 300’s displaces more–293.2cc to be exact–via its 72mm bore, which is 8mm larger than the 250 XC-W’s.
The 2018 KTM 250 XC-W’s technical highlights include:
• An updated WP Xplor 48 upside-down split front fork with new outer tubes for more sensitivity, less stiction and reduced weight. Its settings have been revised to make it stiffer as well.
• An updated WP Xplor PDS rear suspension that features stiffer settings.
• An updated 38mm Mikuni TMX carburetor with new settings and a new angle (turned 7°) for more controllable power with reduced fuel overflow. It is also claimed to be less sensitive to altitude and temperature changes
• A new CDI control unit for improved starting. The ignition curves remain unchanged from the previous model.
• New radiator guards designed to provide better airflow in muddy conditions.
• A 249cc two-stroke engine that features a compact shaft arrangement for better mass centralization.
• A cylinder with twin-valve controlled power valve for smooth power that can be adjusted within seconds for different track conditions.
• A lateral counterbalancer that reduces engine vibrations and helps to reduce rider fatigue.
• A six-speed wide ratio transmission.
• A hydraulically operated DDS clutch features a damping system for better traction and durability.
• Lightweight Chromoly steel frame provides high torsional rigidity with less longitudinal stiffness for optimal handling and energy absorption
• PDS Shock mounting geometry is matched to the aluminum swingarm with a centered location for nearly symmetrical loads to the swingarm.
• Forged aluminum triple clamp with handlebar positions and a 22mm offset.
• ODI grips that feature a lock-on design for the left grip and a vulcanized grip on the throttle side.
• “No Dirt” footpeg design keeps the pegs pivot from becoming clogged.
• CNC machined hubs, Giant rims and Dunlop tires.
• Airbox and filter design provides maximum performance with fast “no tools” air filter changes.
• Bodywork with perfect ergonomics and contact points for maximum control and comfort.
• 2.6-gallon see-through polyethylene tank.
• “No Dirt” shift lever prevents dirt from fouling the lever joint.
2018 KTM 250 XC-W / 300 XC-W Specifications
Engine Type: Single Cylinder, 2-Stroke
Displacement: 249cc (250) / 293.2cc (300)
Bore/Stroke: 64.4 x 72 mm (250) / 72 x 72 mm (300)
Starter: Electric, Lithium Ion 12 V 2 Ah / Kickstarter
Transmission: 6 Gears, wide ratio
Fuel System: Mikuni TMX 38 Carburetor
Lubrication: Premix 60:1
Primary Ratio: 26:73
Final Drive: 13:50
Cooling: Liquid Cooling
Clutch: Wet Multi-Disc DDS Clutch, Brembo Hydraulics
Ignition: Kokusan
Frame: Central Double-Cradle Type 25CrMo4 Steel
Subframe: Aluminum
Handlebar: Neken, Aluminum Ø 28/22mm
Front Suspension: WP Xplor USD Ø 48mm
Rear Suspension: WP Xplor PDS Monoshock
Suspension Travel Front/Rear: 300 mm / 11.8 in; 310 mm / 12.2 in
Front/Rear Brakes: Disc Brake 260 mm; 220 mm
Front/Rear Rims: 1.60 x 21” / 2.15 x 18” Giant
Front/Rear Tires: 80/100-21” / 110/100-18” Dunlop GEOMAX AT81
Chain: 5/8 x 1/4 in
Silencer: Aluminum
Steering Head Angle: 26.5º
Triple Clamp Offset: 22 mm
Wheelbase: 1,482mm ± 10 mm / 58.3 ± 0.4 in
Ground Clearance: 370mm / 14.6 in
Seat Height: 960 mm / 37.8 in
Tank Capacity, Approx: 10 l / 2.6 gal
Weight (without fuel), Approx: 100 kg / 220.5 lbs
The 2018 150 XC-W’s technical highlights include:
• An updated 38mm Mikuni TMX carburetor with new settings and a new angle (turned 7°) for better controllable power with reduced fuel overflow. It is also less sensitive to altitude and temperature changes.
• And updated WP Xplor 48 upside-down split front fork with new outer tubes for more sensitivity, less stiction and reduced weight. Revised settings are stiffer as well.
• An updated WP Xplor PDS rear suspension features stiffer settings while still offering the progressive feel and excellent bottoming resistance only PDS can provide.
• A new CDI control unit for improved starting. Ignition curves remain unchanged.
• A new radiator guards provide better airflow in muddy conditions.
• A 143.99cc engine that features a compact shaft arrangement for better mass centralization.
• A six-speed wide ratio transmission developed for enduro
• A Brembo hydraulic-actuated clutch that is designed to provide excellent modulation while remaining reliable.
• Lightweight Chromoly steel frame designed to provide high torsional rigidity with less longitudinal stiffness resulting in optimal handling and energy absorption.
• Shock mounting geometry that is matched to the new swingarm with a more centered location for nearly symmetrical loads to the swingarm.
• A forged aluminum triple clamp with handlebar positions and a 22mm offset for precise handling.
• A throttle assembly with easy freeplay adjustment similar to the four-strokes, featuring exchangeable throttle cams for different opening characteristics of the throttle
• ODI grips that feature a lock-on design for the left grip and a vulcanized grip on the throttle side
• A “No Dirt” footpeg design that keeps the pegs pivot from becoming clogged.
• CNC machined hubs, Giant rims and Dunlop GEOMAX AT81 tires.
• An airbox and filter design that allows quick, “no tools” air filter changes.
• Bodywork with ergonomics and contact points designed to provide control and comfort.
• A cooling system that features stiffer radiators with better cooling efficiency ande new radiator guards designed to provide crash protection.
• 2.6 gallon see-through polyethylene tank provides.
• A “No Dirt” shift lever prevents dirt from fouling the lever joint.
2018 KTM 150 XC-W Specifications
Engine Type: Single Cylinder, 2-Stroke
Displacement: 143.99 cc
Bore/Stroke: 58/54.5 mm
Starter: Electric, Lithium Ion 12 V 2 Ah / Kickstarter
Transmission: 6 Gears, Wide Ratio
Fuel System: Mikuni TMX 38 Carburetor
Lubrication: Premix 60:1
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
Subframe: Aluminum
Handlebar: Neken, Aluminum Ø 28/22mm
Front Suspension: WP Xplor USD Ø 48mm
Rear Suspension: WP Xplor PDS Monoshock
Suspension Travel Front / Rear: 300 mm / 11.8 in; 310 mm / 12.2 in
Front/Rear Brakes: Disc Brake 260 mm; 220 mm
Front/Rear Rims: 1.60 x 21” / 2.15 x 18” Giant
Front/Rear Tires: 80/100-21” / 110/100-18” Dunlop GEOMAX AT81
Chain: 5/8 x 1/4 in
Silencer: Aluminum
Steering Head Angle: 26.5º
Triple Clamp Offset: 22 mm
Wheelbase: 1,471mm ± 10 mm / 57.9 ± 0.4 in
Ground Clearance: 370mm / 14.6 in
Seat Height: 960 mm / 37.8 in
Tank Capacity, Approx: 10 l / 2.6 gal
Weight (without fuel), Approx: 91.5 kg / 201.7 lbs
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