This is a new version of the OS Speed fitted with the new 21JS Carb as used to win the IFMAR 2008 World Championship!! If you want to win World Championships you need the best engine... and this is it! From the ceramic rear bearing to the specially plated crankshaft with heavy metal balance inserts, the Speed 21 is all about ‘no compromise’. Tune the throttle response by selecting one of 3 carburettor inserts Displacement: 3.46cc (0.211cu.in) Bore: 16.60mm (0.654in.) Stroke: 16.00mm (0.630in.) Power Output: 2.5PS@34000 RPM Practical RPM: 3000~40000 RPM
