Triumph Speedtwin 510 trials motorcycle. 1964. Frame no. H16179 Engine no. EC18448 T100S From a private collection. Runs and rides. Built and ridden by Frank Bourne. Developed over many years. Comes with Alloy barrels, special long stroke engine, Boyer electronic ignition, flywheel cover width reduced, head angle altered to improve steering, Cub heavy duty forks, wheels, brakes and subframe, stainless exhaust.