To start off I have a 1998 tigershark 640l. The block was cracked so I purchased a used 640 motor off of ebay. When I went to install it I noticed that the cracked motor has a the big round coupler, and the new motor has the coupler that requires the rubber dampner piece. I know they thread off of the crankshaft, but the old motors crank is larger than the new motors. What are my options?
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