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In accordance with established Internet marketing principles, Triumph has revealed a few details and photos of its new four-stroke 250 motocross engine, with broad hinting that it will in time serve in other roles.
As some have already commented, its general appearance is like that of the current KTM 250, with forward-facing exhaust, primary drive on the right, and chain-driven DOHC. Also like the KTM the crankshaft’s primary pinion also drives a jackshaft directly above it, where the 2:1 reduction for the cams occurs. The water pump is on the outer end of this shaft.
This produces some confusion, as with the bottom cam-chain sprocket turning opposite to the crank, the cam-chain tensioner is now on the front of the chain housing, giving the initial (but false) impression that the engine spins opposite to the wheels—in the case of Yamaha’s first M1 990cc MotoGP engine of 2002, the tensioners being on the front gave correct information—that engine did spin opposite to the wheels.
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