One the biggest reasons for a move from high oil content ratios in 2-strokes has been manufacturing tolerances and the type of bearings used. Plain rod bearings were used in older equipment and they needed more oil than newer engines with roller and needle bearings.
While today's synthetic oils have better lubrication properties than the stuff my dad used to put in his lawn mower 50 years ago, the rods still have the same bearings of old. Other than smoke reduction I have never been able to understand why someone would risk their engine and reduce the mix ratio. Oil is cheap in comparision to fixing a broken rod.
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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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