Austrian motorcycle manufacturer KTM has officially revealed two-stroke motorcycles with fuel injection technology called Transfer Port Injection.
Available in 250 and 300cc capacities, the new single-cylinder engine guarantees the best of both the worlds while adhering to the strictest emission norms. Called the KTM 300 EXC TPI and the KTM 250 EXC TPI, the enduro machines are the world's first fuel injected two-stroke motorcycles.
The bikes utilises Transfer Port Injection, which primarily uses two injectors to supply fuel into the transfer ports of the cylinder, mixing it with the flow of air and oil supplied through a throttle body.
The innovative system is said to make the motor smoother to ride, with better fuel efficiency as well as eliminating the requirement to pre-mix fuel or switching the carburettor jets for different conditions.
The entire system is controlled by a particular new engine management system which determines the exact quantity of fuel to be sprayed into the ports at any given time, while the second injector in the throttle body mixes small amounts of oil with the incoming airflow to ensure lubrication of the engine's moving parts.
The new ECU employs a number of sensor readings to determine the precise ignition timing and fuel injection.
Joachim Sauer, Product Marketing Offroad said, "It is a very proud moment for us to unveil the world's first serial electronic fuel injection 2-stroke off-road competition bikes. We at KTM are committed to developing revolutionary technology, and with the KTM 250 EXC TPI and KTM 300 EXC TPI models we feel the game has once again been changed, as this is a global first."
He further added, "Our goal was to create a 2-stroke Enduro bike that would not be incredibly complex, while also retaining the feel of a carbureted machine, yet with all the benefits of fuel injection. This includes the elimination of the need to pre-mix fuel or change the jetting for different environments, which is a major benefit to the rider for hassle free, 2-stroke fun,"
Apart from the radical new two-stroke engines, the motorcycles come with hi-end equipment as well. Features of the KTM two-stroke motorcycles include fully adjustable WP suspension, Brembo brakes and a lightweight steel alloy double cradle chassis.
The bikes meet the stringent Euro 4 emission norms. Pricing has not been revealed by KTM and is expected to be available by June this year.
What is more important is that it stresses the fact that two-stroke engines can be environmentally friendly. It will be interesting to see if KTM will offer a road-going version of the two-stroke powered motorcycles.