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  1. Vintage Ski Doo's
    I'm looking at an air cooled Skidoo 640 from I think the late 70s, early 80s. One web sight said they were 46hp. Is that true. I question that, account a 503UL air cooled engine on my Ultralight, makes 50hp at 6500rpms. I would expect a 640cc engine, to make at least 10-15hp more than a 503UL...
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