1979 70HP evenrude

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sport8

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Aug 30, 2004
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I just put this motor on my boat, it starts fine runs through fwd and rev fine with mufs on, I put it in the water and as soon as I put it in gear the motor bogs down and dies. I always have to choke to get it re started no matter how long it runs. I tried to idle it up a bit with no luck on leaving the dock.
 
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Dhadley

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Feb 4, 2001
Messages
16,978
Re: 1979 70HP evenrude

Welcome!!<br /><br />The first thing to do is take compression. Lets make sure we have a healthy motor first. <br /><br />Sounds like the carbs need a good bath. Not a shower, a bath. Let 'em soak. Its not unusual for an outboard to idle OK out of the water with no exhaust backpressure but not in the water if the carbs need attention.<br /><br />Lets start with that so we know we have a good base to work from.
 
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sport8

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Aug 30, 2004
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Re: 1979 70HP evenrude

OK, thanks for the advice. I took compression readings, they are 125, 123, 125. I also checked the timing but could not get a load on the motor. at idle in a water tank the timing was 5deg. Im going to try the carbs now and will see how that works. By the way this thing has a 131/4 x 17 prop on it, the same as the 71 100HP I took off. engine is on a 17.5 ft glasstron runabout.
 
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sport8

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Aug 30, 2004
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Re: 1979 70HP evenrude

Dhadley, thanks for the advice I took carbs apart, soaked them a couple hours, blew them out with compressed air put them back on and the thing runs like brand new!!! took my son out to the lake. Thanks again.
 
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