2011 KTM 350 SX-F

The 350 SX-F has an ultra-compact 4-stroke engine with modern electronic fuel injection and electric start. The extremely short stroke 349.7cc DOHC engine with 88mm bore and 57.5mm stroke has a wide usable speed range, top performance and easy rideability.

DOHC Cylinder Head

Four ultra lightweight titanium valves in combination with DLC coated finger followers allow a high RPM limit of 13,000 RPM.

Valve Train

The crankshaft turns an intermediate gear, which drives the cam chain and at the same time acts as a balancer shaft and holds the water pump. A hydraulic cam chain tensioner secures a reliable tension of the chain and precise cam timing.

E-Start

A few years ago KTM proved that an electric start in motocross is a great advantage. The new 350 SX-F can be started easily by the press of a button and has the option to retrofit a kickstarter to the bike.

* Following variations are possible:

A. Only E-start (stock)

B. E-Start plus Kickstart

C. Only Kickstart

Balancer Shaft

For Balancing the rotational masses, the 350 SX-F engine has a balancer shaft on the right side of the engine that acts at the same time as a water pump intermediate gear and drive pinion gear for the camshaft. This solution secures a very compact overall design of the engine.

Transmission and Clutch

The newly developed 5-speed gearbox was designed to suit the engine characteristic of the 350 SX-F. The hydraulic clutch by Brembo guarantees light operation, automatic adjustment and easy modulation of the clutch.

Lubrication System

The new 350 SX-F engine has two oil pumps similar to the 250 SX-F engine. A pressure pump supplies the crankshaft, piston and valve train. Additionally, it supplies lubrication for the clutch and cools the ignition. A suction pump evacuates the crank housing and lubricates the gearbox. This also creates vacuum in the crank housing to increase the engine performance.

Engine Management System (EMS)

The newly developed engine management system by Keihin with electronic fuel injection and 42mm throttle body secures spontaneous and powerful response and maximum performance.

* Temperature and altitude compensation as well as the automated cold start system are state of the art.

* An optional KTM Power Part map select switch with aggressive, standard and soft modes activates additional preset engine mapping

* A KTM Power Part user setting tool will allow data logging with a laptop and provides the opportunity to change the mapping with a few mouse clicks. The software gives the possibility to adjust the fuel mixture exactly for every RPM range.