[Dave Box]

Just to clarify when I said seals I meant to say "crankshaft seals". These are the usual suspects although any crankcase leak will prevent the engine from running. Also the purpose of spraying WD40 on the crankshaft seals is to temporarily close the air gap caused by the worn rubber seal and thus diagnose a bad seal. The only viable repair is to replace both seals (if that is indeed the problem). Sorry if I was insufficiently verbose.

Dave