#twostroke #dirtbike #motocross
Dean Dickinson, owner of R&D Racing, is one of the best two-stroke tuners on planet Earth. He has built two-stroke engines for just about every top amateur coming through the ranks for the last three decades (and his dad Rudy did it before him). When it came time for Dean to build our KTM 125SX, his goal was not to change the powerband’s personality. He wanted to raise the power output everywhere so it would make the same curve on the dyno. He cleaned up the cylinder, cut the head, used a stock piston, added a Bud Racing exhaust pipe and silencer and focused his attention on fine tuning the carburetor. He spent most of his time on the Mikuni carburetor and said he could find a lot of power with the small modifications he did. The R&D engine came to life instantaneously with a twist of the throttle. It offered more of a torquey four-stroke feel off the bottom. The power profile connected the mid and top into a single blended powerband. It was an exciting, powerful engine that was easy to ride. Test riders felt that recovering from mistakes was simple with the added grunt this engine had. Our R&D-modified KTM 125SX engine excelled on tight tracks, as they really highlighted its torquey feel. On the other hand, on faster tracks, every tester thought the power output was increased over stock and revved further.
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