I won't address fuel economy, but I received today a 2015 KTM 250SX 2T single engine for a project. The engine less carb, exhaust and shift/kick levers weighs 46.5 lbf, but in standard MX trim puts out nearly 50 hp (significantly more than the 4T 250 MX engines).
Sounds like a good thing to me!
cheers,
Michael
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