Re: Why do JD engines go putt-putt?

Posted by Jon H on February 14, 2004 at 08:01:22 from (69.26.17.158):

In Reply to: Why do JD engines go putt-putt? posted by PD on February 13, 2004 at 20:20:58:

The Wisconsin 2 cyl is even fire with both pistons comming up together and firing 1 per revolution. If you get a look inside the Wisconsin crankcase, you would see it has a large counterweight on the crankshaft to balance the mass of both pistons/rods moving in the same direction at the same time. The JD crankshaft is a 180 degree design which needs little or no counterweighting,but gives that rough,uneven firing order. The Wisconsin has a smooth,distinct,put put sound,while the JD has more of a prup prup sound with both cylinders firing in 1/2 revolution,then coasting for 1-1/2 revolution.

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