Even though a two-stroke single-cylinder engine gives the best power-to-engine weight ratio, its biggest drawback is the poor emissions control inherent in the engine’s design. Austrian maker of dirt-bikes and other performance motorcycles, KTM, has unveiled a new two-stroke single that it believes will revolutionise the off-road motorcycle world.

Designed to fit into its 2018 enduro bike, the KTM EXC, the two-stroke, single-cylinder engine – developed in-house at KTM’s Mattighofen R & D facility – will feature a new way of delivering fuel and lubricant to the cylinder. Dubbed Transfer Port Injection (TPI), KTM claims this new technology drastically reduces fuel consumption while eliminating the need for pre-mix fuel or adjusting carburettor jetting.

“This is an incredibly exciting development for KTM. We have been developing 2-stroke fuel injection for some time, and our goal was to create competitive motorcycles with all the benefits of fuel injection,” said Joachim Sauer, KTM Product Marketing Manager. The off-road bikes that will receive the new two-stroke TPI engine are the 2018 KTM 250 EXC TPI and KTM 300 EXC TPI, which debut in May.

“In the USA and Canada, the new 2018 KTM 250 XC-W TPI will be available in very limited quantities in late fall,” said Sauer. For Malaysia, the 2017 KTM motocross range starts with the two-stroke 250 EXC Six Days, which retails for RM38,160.

Next up are the four-stroke enduro 250 EXC-F and 250 EXC-F Six Days, which go for RM41,870 and RM45,050, respectively. The KTM 350 EXC-F and 350 EXC-F Six Days are priced at RM42,400 and RM45,580, while the 450 EXC-F at RM42,930 and the 450 EXC-F Six Days at RM46,110 top out the range.

Also offered is the competition-only KTM 450 SX-F – which omits lighting and other road legal equipment – at RM39,750. All prices include GST.