Evinrude 6hp fisherman problems

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Graeme Cushnie

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Jan 31, 2003
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Hi, I have three points that I could do with help sorting out. Firstly, I 'inherited' a engine with my 21ft drascombe cruiser but I am running up against a brick wall. I need to know the age before I can get a manual, and I need a manual to service the engine. <br /><br />The serial number is 6403CC57846. Any ideas about age?<br /><br />Also is it still possible to get manuals for these?<br /><br />Finally, what would be the best prop on this engine for a 21ft, 5ookg, displacement day sailer?<br /><br />I hope that someone can help.<br /><br />Graeme<br />Isle of Man
 
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ob

Admiral
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Aug 16, 2002
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6,992
Re: Evinrude 6hp fisherman problems

I believe that the first four numbers 6403 is a 1974 model 6 hp.See if you can locate that number as a model number on the transom bracket or a silver wesh plug on the engine block.
 
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Bear

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Re: Evinrude 6hp fisherman problems

Hi Graeme!<br /><br />I think that is a 1974 model as ob said.<br /><br />I don't know if there were any major changes from 1971 to 1974. <br />Evinrude 1971 specifications <br /><br />1971 Evinrude 6 hp Fisherman <br /><br />6102 Evinrude 1971 <br />6 hp @ 4500 rpm<br />8.84 cu.in. = 144.8 ccm <br />2 cylinder<br />51 lbs. = 23.1 Kg <br />Prop 8 x 7 1/4 , 2 blade <br /><br />Manuals in UK <br /><br />Also try a search in this section/forum for <br />"evinrude fisherman"<br /><br /> http://marinemechanic.com/site/propchart.htm <br /> Propellers for Evinrude 3-18 hp <br />The same 8 x 7 1/4 as above and a 7 3/4 - 6 1/2 3 blade.<br /><br />Is there a problem with the prop you have? No power in reverse I guess. There was a piece of tube you put on the exhaust outlet to move the exhaust away from the propeller. It made some improvement regarding stopping power.
 
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Graeme Cushnie

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Re: Evinrude 6hp fisherman problems

Thanks for taking the time to reply to my post guys. You have been more than helpful. This truely is a great forum. Maybe I can help in the future. Thanks again.<br /><br />Graeme
 
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Graeme Cushnie

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Re: Evinrude 6hp fisherman problems

Bear, you referred to a tube that can be fitted to the exhaust. Are these still available, and more importantly could slow speed running be affected by the exhaust flow not being cleared away quickly enough? <br />Would the tube aid this?<br /><br />Thanks<br />Graeme
 
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alcan

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Dec 14, 2001
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Re: Evinrude 6hp fisherman problems

Hi Graeme<br />Yes, exhaust flow would have an effect on slow speed and hi speed. How ever, unless you have sea weed or other debris plugging the exhaust outlet, I doubt that is your problem. Most restricted exhaust problems occur at the powerhead, around the exhaust ports. Excessive carbon build-up is usually the simptom of the cause. At slow speed most of the exhaust is routed thru the exhaust relief port on the back of the exhaust housing above the water line. This is the purpose of this port. If you could give us more details on your problem we could probably head you in the right direction.
 
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Graeme Cushnie

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Re: Evinrude 6hp fisherman problems

Thanks Alcan, What you have said make loads of sense, infact quite obvious once you said it. The reason I was thinking along these lines was that the engine was not running at the low revs I was expecting, infact it was pushing me into the harbour a little harder than I would have liked. I took it to an experienced friend at the lifeboat house and he removed the carb, checked the jet, reset the mixture and advanced the 'cam' (the part unerneath the flywheel that pushes against the throttle lever) and things seemed better, but it does still stall when in gear just above tick over. The above-water exhaust and water port seems clear judging by the amout of water that is discharged through it. I am reluctant to take the head off or apart due to the age of the engine and because it is still running.<br /><br />Thanks again for helping<br />Graeme
 
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alcan

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Re: Evinrude 6hp fisherman problems

Hi Graeme<br /> I don't think it would be a good idea to disassemble the powerhead right now either. I would give it a compression test. When the throtle cam was adjusted, was that do to wear on the plastic follower? I have found that when this follower wears a good groove in it, That it should be replaced and the cam set back where it was or close to it. Another thing to check for would be air leaks in the fuel system. The connectors can leak air but still not leak fuel. Next check the ignition system.
 
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Graeme Cushnie

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Re: Evinrude 6hp fisherman problems

Thanks again, I would hate to think how much I'd have to pay a workshop to get the amount of quality adivce I have from this forum and yourself.<br /><br />I have now had the points checked and all is ok. I'll look into purchasing a new follower setup.<br /><br />Maybe I should be content that it gets me in and out of my berth with a fair degree of control and confidence and keep treating it with TLC, after all it is nearly middle aged!<br /><br />Safe sailing<br />Graeme
 
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Bear

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Re: Evinrude 6hp fisherman problems

I have a '65 Johnson 6 hp. The follower had deep groves in it. I made a new one from a piece of rubber hose. Take it apart and find a rubber hose to cut from. Worked for me for years.<br /><br />The exhaust pipe I mentioned is mounted under the anti cavitation plate on the exhaust outlet. Quite common around here, on sail boats, long time ago. I have no picture of it. It was for more stopping power, or thrust in reverse. The propeller is sucking air or exhaust. <br />Same inner diameter and shape as the exhaust outlet. Length about 5 inches.<br /><br />This isn't a huge problem for me, it is on a small jonboat. Top speed at wot is about 6 knots. But sometimes when you put it in reverse to back against the wind almost nothing happens. It just revs. On your sail boat you might consider to find an outboard with more thrust in reverse. Or learn to live with what you have. :) <br /><br />Be safe!
 
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Graeme Cushnie

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Jan 31, 2003
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Re: Evinrude 6hp fisherman problems

Bear, thanks again for the advice. I too have a boat with a max speed of about 7 knots and I guess I was just hoping for perfection. The engine is actually running quite well at the moment and seems to have plenty of stopping power. I will keep an eye out for the attachment, just in case.<br /><br />Thanks again<br />Graeme
 
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