83 Merc 50hp

[Boneyard16]

I picked this up pretty cheap and I don't know a whole lot about it but Im pretty good at fixing things up. I need to find out first what prop size is best for a 16 foot tri-hull for all purposes. Fishing, tubing, and hopefully a little skiing. Second I need to find out if it should pee all the time or just at some of the higher rpm's it gets a pretty good stream going at 1/3 throttle (I have no tach) and continues through wide open. While idling of at low RPM's is will dribble a bit or come out in spurts. Is this a problem?

 

[12Footer]

Re: 83 Merc 50hp

Can't help ya with the prop thing.It's all rocket science to me

<br />But on the subject of cooling, it sounds like the impeller is worn out,or the thermostat is corroded shut. The latter is more suspect if the engine sat for a long peroid of time without use..<br />Impellers wear-out quickly on most outboards and it should be replaced every 100hours or every two years,just as routine maintainance.<br />This is something that you don't want to fail out on the water.

 

[markcv4]

Re: 83 Merc 50hp

I have a 1986 35hp mercury. at an idle it puts out a good stream of water at low idle.<br />It's a sign of a bad impeller for sure.<br /><br />Markcv

 

[Boneyard16]

Re: 83 Merc 50hp

thanks for the input i'll replace it before the weekend (weather is going to be great) on to the next question. Wow I'm new to this i just found a new in the box prop on ebay the prop i have now is a 12 pitch and the one on Ebay is 13. What differences will i see?

 

[corm]

Re: 83 Merc 50hp

Hi,<br />The one you have is better. The 13" should be to large and not let the engine rev-up.<br />...have fun...corm