George Punter
Active Member
These photographs show the construction of some of the parts of the 150cc 3 cylinder engine. The crankshaft was machined from a solid billet of 4140 steel and took 15,000 turns of the handle on the rotary handle to machine the big end bearings! An oil pump provides oil to the centre bearings and big end bearings. All the castings for the engine and gearbox were cast in and later machined in my workshop.
George.
George.