Can anyone advise if there is a right and wrong way of orientating the piston on my M21. Does one side have to face the exhaust as in ohv engines. Just there does not seem to be any obvious marks identifying orientation on the +60 that I am about to fit. Hate to make a schoolboy error this far into rebuild. Many thanks Steve
Is it a split skirt type? If it is, the split must face the thrust side of the piston, ie the front of the engine, if it is not a split skirt type it can go either way. What make of piston is it? If it came in a plain white box with a small Union Jack on it, the best place to fit this type of piston would be in the bin!!!
Thanks Dave, It is an original BSA one supplied by Les at Russell Motors has no skirt so will fit creatively. The crank bearing is from M.E.S.S. such provenance. Best Regards Steve.
