Check out this manual by Harry Stryker.
He overhauled around 200 of them. this manual has it all from dissasambly to reassembly.
His Mentor was Jack London who was taught by George Bignotti.
Probably the only manual ever made on the Offy midget engine overhauling. Will be a collectors piece eventualy.

http://openwheelracers3.com/Book_Reviews.html

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