The price difference in a 40d and 50d was about $400 if I remember correctly. Shoot it was $250 between a 25 and a 30. And all you had to do is take a throttle stop or on the later change the gasket behind the carb and it was a 30. Oh and bump timing 5 degrees. When I worked at DHP for the Pooles we made all the 25 hp motors 30 hp before they left the shop.
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