Author Topic: McCULLOCH KART RACING 1962  (Read 1798 times)

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Offline Al Smith

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Re: McCULLOCH KART RACING 1962
« Reply #10 on: November 02, 2014, 08:52:53 pm »
I don't recall ever seeing a Mac engine with banjo bolts but have no doubt there were some .Horstmen or Wiseco made an overbore piston for some model of McCulloch up to 100 thou over  size .Usualy though on a rebore they took it up 2 to 5 thou .Whatever it took to clean up the cylinder .

Now on the 100 thou over I'm not certain if they put in a new sleeve or not because 100 thou would not leave much meat left on the cylinder wall ..I doubt seriously if that size overbore was used much .

They had stroker full circle crankshafts and just all kinds of goodies that are nearly nonexistant today .

The life of a full blown kart engine was normally less than one hour total running time between rebuilds .Less if they came apart like a dollar watch which they did on occasion .It was just unbelievable how much power they could get out of them and that was 50 years ago .

 

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