HBK-211 and HBK-311
This stage 1 kit is suitable for all Speedmaster and America, Bonneville, T100 and Thruxton engines with 865cc engines and carburetters. It contains full instructions, a range of main jets to suit all exhaust and inlet modifications and will release about 10% more power.
This kit is suitable for all 790cc engines and shows a 10% increase in performance when used with Norman Hydes our own silencers. It also dramatically reduces the exhaust ‘popping’ that occurs on the overrun when the throttle is closed.