I have a 1976 Johnson 70hp 3cyl. 2 local shops told me its to old to work on. I took it an hours drive away to a shop that has had it for 4 weeks and said not sure whats wrong but sometimes engines are just old. LOL Has great compression. Took it our and ran great for about 15-20 mins then lost power like running on 2 cyl. Let it sit for about an hour while swimming. Ran worse upon restart. sounded like 1 cyl.
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Looking for a knowledgeable western NY repair shop for a 1976 70hp
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