Classic Motorcycle Mechanics

ANCESTRAL POWER PLANTS

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The DAX’S powerplant might very well be a fairly sophistica­ted (for the period) overhead cam motor, but it owes its very existence to something much earlier and arguably equally revolution­ary. Pretty much all the small Honda singles are indebted to a humble, yet technicall­y influentia­l engine that first appeared back in 1958. Honda’s C100 Super Cub was designed to provide powered transport to people who weren’t motorcycli­sts… or car drivers. The very first Honda step-thru was targeted at people who needed basic, yet dependable transport and whose only experience of powered movement was a push bike. The power unit featured a semiautoma­tic transmissi­on system coupled to a very basic, yet exquisitel­y designed and built, push-rod valved, 50cc four-stroke motor. With the emerging Asian Tiger economy gaining momentum yet not technicall­y savvy or automatica­lly enginefrie­ndly, the motor was as basic as possible. In fact, the lubricatio­n system didn’t even have an oil-pump! Oil was picked up from the bottom of the sump by a hooked metal finger on the bottom of the con-rod. This ‘oil flinger’ hurled lubricant to the upper reaches of the cylinder head, thereby keeping the valve-train happy. Now you might think this arrangemen­t was primitive and trouble prone, but not a bit of it. Honda took the prestigiou­s Maude’s Trophy with a team of 20 riders running a C100, C102 and C110 for an entire week, 24/7, completing 15,800 miles. And that, folks, was the foundation stone of the DAX and many other small single cylinder machines.

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