Evinrude 7.5 will not rev past half speed in forward

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Seafare_Joe

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Joined
Jun 20, 2001
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3
This engine will very high RPM's in both Neutral and Reverse. However when I change to forward gear, I only get half the RPM's even the the throttle moves to fill open. I have new Plugs, cleaned the carb. Any Help?
 
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Seafare_Joe

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Jun 20, 2001
Messages
3
Re: Evinrude 7.5 will not rev past half speed in forward

I do not know the exact age of the motor, (Original 1973 ??)
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But it has been on our 1973 sailboat since we bought her in 1987.<br /><br />------------------
 
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Seafare_Joe

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Joined
Jun 20, 2001
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3
Re: Evinrude 7.5 will not rev past half speed in forward

I am having similar problem. Let me know if you get the answer...
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Perfect3nemy

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Mar 26, 2007
Messages
1
Re: Evinrude 7.5 will not rev past half speed in forward

I had the same problem on my motor. It turned out to be cracked o rings in the fuel line quick connector. Any leaks in the pressure tank or tubes will also cause this problem.
 
Chinewalker

Chinewalker

Fleet Admiral
Joined
Aug 19, 2001
Messages
8,902
Re: Evinrude 7.5 will not rev past half speed in forward

90 percent of the time this happens, it is a matter the motor only running on one cylinder. Check for good spark on both cylinders. Might be as simple as installing new spark plugs. Could be a coil. Won't know until you trouble-shoot it.

Check for water on the spark plugs (indicating a blown head gasket).

Also, always post your motor's model number with your post. Evinrude built 7.5s in the 1950s and then not again until 1980. COMPLETELY different motors...

- Scott
 
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