1970 chrysler outboard lunging

bassmaster75

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Aug 10, 2008
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i recently bought 1970 45 hp chrysler ob and took it out today. i noticed a lunging effect when running at steady rpm for a period of time. dont know much about outboards so im looking for suggestions. also i heard a rattling or sounds of something hitting under motor cover. dont know what that is. any info would help. also i need a new prop and i know nothing about pitch so what pitch and size should i get? thanks
 
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