Friday, 10 April 2020

QR50 - Oil Pump

The QR50 engine uses a crankshaft driven oil pump to force 2 stroke oil from the spine tank into the carburetter. This is controlled through a cable operated cam which restricts pump stroke; the cable is operated in tandem with the throttle. The original pump was damaged, in that the operating cam and the cable operated lever was broken out of the casting:

Rather than attempt to repair this casting, which would have meant machining a new one from bar stock and guessing at what the operating cam looked like I bought one from a chap on eBay:

It cleans up OK. All we need is a repaint:

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