Aermacchi M-65 Specs

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44mm bore and 42mm stroke actually comes to 63.8cc—but 65 sounded so much more refined. A cast-aluminum head on an iron barrel compression 8.5:1, power rating approximately 4.5 horsepower.  Note: M50 head bolts are about 44mm center to center. 65 is more. M50 pistons are 38.8mm

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