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| Joined: | Mon Jul 24th, 2017 |
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The 610 and 820 crankshafts were made the same without welded on counterweights.
I think the counterweights were added for the Earl Larsen 820 class. The engines had specific requirements and were not modified. Maybe someone has the specs somewhere. They may have been added by the factory for a special run of engines.
I found one of the engines on an enduro kart and it had the counterweights. It was stamped by an engine builder in the mid-west.
I remember reading that the class didn't allow the main crank bearings to have the plastic ball retainers.
Interesting subject
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