I ground out the ports, lightened and polished the
valve gear, and fitted the little bike with a Yoshimura racing piston.
Along with its feathery weight of around 80KG, it became capable of
outdoing much larger bikes on twisty roads. Even in a straight line
it could keep up with some 250s. A Yoshimura race cam was acquired but
never used for lack of better valve springs.
took this bike racing in the Triplex event at Benalla, as a Swinburne
club member. Rain and another bike's spilled oil wrecked the potential
for more fun, but it caused a few surprises and earned a first-place
trophy for the sub-150 category.
days people take CB125Js and similar bikes Bucket
Racing: a fabulous low-cost class of road race that originated
in New Zealand and has spread to Australia. It's serious stuff! And if you're in any doubt that these can be made into beautiful little bikes, check out this example.
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