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[joeninety]

This must be the first example of a Jim Lee frame made in his garage in conjunction with Geoff Thorne. Jim didn’t have a pipe bender so Geoff made one! It is in fact a scaled down “Featherbed” copy housing a very special BSA 250cc C15 motocross engine and close ratio motocross gearbox. The frame stove enamelled in bronze constructed in Renolds 531 tubing had one flaw the swinging arm could have done to be a little longer but not bad for a first attempt. The headstock was machined out between the bearing housings to save a little weight as were the clip on’s but just enough as not to sacrifice strength.
The forks were off a 500cc AJS as was the front brake which was modified from single leading to twin leading shoe type. Standard Girling shocks bring up the rear. The seat was made by Geoff the petrol tank by Jim and looking very up to date for the year circa 1965. The dolphin fairing was painted a soft green as was the petrol tank and seat upholstered by a local firm in Batley Carr.
The power plant, now here’s a great piece of engineering. The head was converted to accommodate 350cc valves, twin spark plugs one 10mm and one 14mm. Carburettor was enlarged and the inlet flow modified along with stronger valve springs to give a heady 7,900 rpm ceiling. The barrel was bored out and re-lined with a very high quality cast iron and machined so the top was slightly larger in diameter by thousandths of an inch, Geoff’s theory was as it was nearer the hottest part it would expand more. The timing cover was modified to accommodate a rev counter drive and probably drove a Smiths instrument. The electrics were converted from 6volts to12.

By null at 2011-01-12

By null at 2011-01-12
My computer as gone mad posting the same message

Edited by joeninety, 12 January 2011 - 22:07.