2019 KTM 250SX-F FIRST RIDE: THE ’19s VIDEO SERIES

On this edition of The ’19s video series we take a look at the new 2019 KTM 250 SXF and give you our thoughts after the first full day of testing. This machine got all the same chassis updates as the 350 model that included  a new frame, new swing arm, new plastics, new seat, new radiators, new spoke nipples, new rims, and much more.

For more information on the complete line of 2019 KTM SXF  click here!

250 SX-F ENGINE
The 250 SX-F engine is known to be the strongest engine in its engine class. And with updates on valve timing, exhaust, airbox and EMS the entire power pack produces even more torque and power across the entire rpm range up to 14,000 rpm. Its compact architecture contributes to an excellent mass centralization. This supports the easy rideability of the bike together with a low weight of only 57 lb, including the incredibly beneficial electric starter. In short, the combination of a compact engine layout and unrivalled power will make the new 250 SX-F once again an undisputed winner, it is easy to ride for both amateur and professional riders.

250 SX-F CYLINDER HEAD
The centerpiece of the compact DOHC (double overhead camshaft) engine is the cutting-edge cylinder head. It features two overhead camshafts which activate the titanium valves (intake 32.5mm, exhaust 26.5mm) via super-light finger followers with a hard DLC coating. The exhaust cam shaft features a new timing for improved power delivery.
NEW:
New exhaust cam shaft improved power delivery

250 SX-F CYLINDER & PISTON
In the short cylinder that has a bore of 78mm, works a lightweight, forged bridged box-type piston made by CP. It features a unique piston crown shape adapted to the combustion chamber and stands out with its extra rigid structure, combined with a low weight. The compression ratio is at 14.4:1. Thanks to the low oscillating masses, the engine displays extremely lively characteristics.

250 SX-F CRANKSHAFT
The 250 SX-F’s has a rigid crankshaft which features a connecting rod with a plain big end bearing featuring two force-fitted bearing shells run directly on the crank pin. This design is a major prerequisite for the extremely high engine speed levels and the unrivalled maximum power of the 250cc engine. Not only that, it enhances the engine’s durability, allowing long crankshaft service intervals, which is a huge customer benefit in relation to time, effort and cost.

250 SX-F COUNTER BALANCE SHAFT
In order to balance the mass-forces the 250 SX-F engine uses a multifunctional counter balance shaft, which at the same time drives the water pump and timing chain.

250 SX-F ELECTRIC STARTER
The 250 SX-F is fitted with a unique electric starter as standard, which is well known as a clear advantage when it comes to crunch time in the heat of battle. A strong starter motor made by Mitsuba and the proven starter drive guarantees efficient and reliable starting.

250 SX-F ENGINE CASES AND COVERS
The design of the die-cast engine cases allowed for minimal weight and a very centralized shaft configuration. This makes the engine very short and compact, while contributing to an efficient centralization of masses. The engine covers feature a surface structure, which reduce the wear caused by the rider’s boots.

250 SX-F CLUTCH
A newly developed DS (diaphragm steel) clutch features a one-piece clutch basket combined with the primary gear made of high-strength billet steel. It guarantees unbeatable reliability and contributes to the narrow engine size due to its compact rivet-less design. It is fitted with extremely heat-resistant steel carrier friction discs which ensure a good disengagement of the clutch. These are pre-tensioned by means of a diaphragm spring, substantially reducing the operating force required to pull the clutch. The Brembo hydraulic system provides easy and precise modulation.

NEW:
Newly designed DS clutch very compact and reliable clutch system

250 SX-F TRANSMISSION
The 250 SX-F uses a new 5-speed transmission made by PANKL RACING SYSTEMS ensuring the highest durability and reliability level. There was no need to change the gear ratios that are perfectly matched to the power delivery of the large displacement engine.
An advanced “NO DIRT” gear lever design prevents dirt from blocking the joint of the lever and guarantees safe activation of the transmission.
All four-stroke engines are fitted with a gear sensor giving the option of different engine characteristics for each gear.
NEW:
PANKL is the new manufacturer of the transmission improved durability and reliability.

250 SX-F ENGINE MANAGEMENT SYSTEM
The state-of-the-art Keihin Engine Management System, with electronic fuel injection, features a new 44mm throttle body, which provides a spontaneous response and maximum performance thanks to its unique injector position. This guarantees excellent atomization of the fuel with the air on its way to the combustion chamber. In addition there are separate systems for cold start and idle adjustment. A reworked throttle cable mount allow for smoother routing of the cables and better access, an improved seal of the MAP sensor (MAP = Manifold-Absolute-Pressure) makes the system even more reliable.
The ECU features new maps adapted to the new exhaust and cylinder head and it regulates the unique traction and launch control. In addition it provides different maps for optimal power characteristics for each gear according to the information received by the gear sensor.
NEW:
Reworked throttle body improved throttle cable routing and better reliability
New maps, optimized Launch and Traction control set-up optimal performance, more efficient starts, better traction

CONCLUSION
Dominance in international Motocross and Supercross racing
Class-leading power, agile handling
Lowest weight in the 250 class
Electric starter for easy and effortless starts
High-level standard equipment

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