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  1. C

    Connected battery backwards - now no juice

    I am embarrassed to say that I connected the battery terminals backwards to my 1992 Yamaha 40hp (C40R) 2cyl. Now, I am getting no juice to the engine, although boat accessories work fine. I popped the cowling and found a fuse on a red wire that enters the motor as part of the wiring harness...
  2. C

    7.5 Engine Revs hi but little thrust

    I have a 1979 merc 7.5 that I just took out of 7 years of storage. Cleaned the carbs and it runs great. However, when I took it out on the water, it putted along fine at low throttle. Then when I increased the throttle, the engine revved high but I got no additional thrust. It seemed like...
  3. C

    Yamaha 40hp. Runs fine 5 min, then hi end dies

    Hi. My 1992 Yamaha 40hp (C40R) 2cyl runs like a top at the high end for the first 5 minutes. Then..."RRRRrrrrrr", it just loses power, and will only max out at maybe 30%. Pushing the throttle past that causes it to die even further. <br />I have to let it sit for a long while (hours, or...
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