BITSA build from spares gathering dust, Chassis BSA B25ss engine XT 600 full rebuild with Joy re- profiled cam, flowed head, Wiseco 11:1 piston, CR carbs, exhaust home made and cones formed over an old fork leg. Electrics are Motogadget m-unit m-button and switch gear, mini speedo. Forks are from a Ducati pantah as are the wheels , disks and calipers from a Ducati 620 , levers and mastyer cylinder from Triumph trophy. The swing arm came from an Ebay find £23 delivered with spindles included, this was a recommendation from American flat tracking champion Stanley Millard who used the GPZ 750 swing arm on his bikes he built. I cut through the rear pivot point and mounted it directly onto the rear engine mount, then removed the rising rate mounts and welded in twin shock mounting points. With the help of the Tech department at Hagon shocks ( and a few road runs when completed) we worked out spring weights for the rear and fitted progressive springs to the front adjusting to gain the correct sag. Light at the rear was a small led unit and a piece of 2 inch stainless tube scalloped to fit snugly onto the seat hump. For a small bike this gives smiles of fun with power to weight ratio that works out at 320 BHP its more than a pocket rocket.