Please can anyone help with some technical information/spec for the 4 stroke sidevalve JAP engine in my recently acquired ATCO standard lawnmower (circa 1928). I have got the engine running, but I would like to have more information about the lubrication system, valve clearances and general engine construction before I launch into a complete tear-down and clean up. The engine is very similar to contemporary motorbike engines. Thanks
Re: JAP 4 stroke engine from an ATCO standard lawnmower[/ We may? be able too help?. www.villiersparts.co.uk