Have repaired two B & S engine with the symptoms you describe. The compression release built into the camshaft was broken. This prevents compression from bleeding off when starting. You would need a much larger starter and battery to overcome full compression while starting the engine. Remove the engine from the mower and remove the sump (bottom) only; replace the sump gasket and oil seal plus purchase a new camshaft. Should be in the neighborhood of $50.00. Set valves at .004" and get back to work!
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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