BillT wrote:I believe the key differences between a G80 and G80C were competition magneto, aluminum cylinder barrel, bigger carb and higher compression.
AMC used a pretty comprehensive machine numbering system in those days, with model year of manufacture, model designation and sequential serial number stamped on the engine case. The variants of the G80 in the mid fifties were G80 (road bike, rigid frame), G80S (road bike, swing arm), G80C (competition, rigid frame) and G80CS (competition, swing arm).
Specs changed over the years, but the typical G80 had an iron barrel and around a 6:1 compression ratio. The G80C or G80CS had an alloy barrel and 7.5:1 or higher compression ratio (you could order your bike with different ratios, up to about 10.5:1, dependent on the year, and 19 or 21 inch front rim, whether you wanted to run scrambles or trials).
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