1984 70HP power loss with no alarm

cchung95

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Joined
Nov 21, 2005
Messages
7
Here's a new one. After reading hundreds of posts and using the Seloc manual, I am still searching for a solution. Any experise would be appreciated.

Shortly after bringing up the engine to 3000 rpms, the revs are reduced to 2000 rpms. I suspect that the rev limiter is kicking in. However, there is no audible alarm when this occurs.

I have determined the following so far:

1. The oil level sensor with the three leds works properly. When the sensor reads the oil low, the red light goes on and the buzzer sounds. This means at least that the buzzer works for the oil.

2. A pot test indicates that the temperature switch closes properly at about 190 degrees.

3. The temperature gauge reads on the lower end of the scale.

4. There is good flow through the system as indicated by water coming out of the telltale and the thermostat passage.

5. The water pump impeller is in perfect shape.

6. The tilt sender with the four wires is not connected to anything.

Any ideas.
 

cchung95

Cadet
Joined
Nov 21, 2005
Messages
7
Re: 1984 70HP power loss with no alarm

More information.

I have discovered that a wire between the temperature switch and the buzzer had a bad connection.

If it is an overheating problem, it should now sound the buzzer when the rev limiting kick in.

In the mean, I am still interested in ideas.

Thanks.
 

cchung95

Cadet
Joined
Nov 21, 2005
Messages
7
Re: 1984 70HP power loss with no alarm

Ok. It is definitely not the temperature switch.
 

cchung95

Cadet
Joined
Nov 21, 2005
Messages
7
Re: 1984 70HP power loss with no alarm

Problem solved, I think. At least the problem is gone.

It was apparently the needle valve on one of the float bowls. For some reason, I didn't catch it earlier. The second time I dissassembled the carbs, I noticed that one of the needles had some varnish that was preventing it from freely moving it up and down. After correcting this problem, everything is working fine.

Thanks for viewing.
 
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