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Which years were these engines built? How does it's performance compare to a Mac or Yamaha? Parts availability? Any info. Thanks

The Atlas came to the US in 1978, the same year as the komet k55. Rods are pretty much impossible to find, as it is a 98mm rod, compared to the komets, which are 96mm. Pistons are somewhat available. Much faster than a Mac, A little faster or the same as a Yamaha.