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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
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  #21  
Old 04-19-2013
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Re: Repair 4 hp two stroke ?

You know the water in the 55 gal drum was not something anyone would like to have a drink after even just a few moments of the little engine running.
I have found out this information outboard 2 stroke engines use the 50-1 mix to cut down on some of the waste oil and pollution that comes with a 2 stroke in the water. It is not to do with keeping the plugs clean as the jet size has more to do with this than the fuel mix. Engines run the best when the right mix is used. Changing the mix is not the way to go change the jets to get a rich or lean mix

I am not sure why folks think one engine type is more reliable than the next ? Build quality from the manufacture has more to do with reliability. In engines look at aircraft as the gold standard. Turbine, 4 stroke, last is the 2 stroke. The 2 stokes best points... simplistic and light weight. Very good power to weight ratio. Low build cost for the manufacture = good profit.
Look forward to hear the replies that will come. Kind Regards, Lou
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  #22  
Old 04-20-2013
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Re: Repair 4 hp two stroke ?

Quote:
Originally Posted by Lou452 View Post
You know the water in the 55 gal drum was not something anyone would like to have a drink after even just a few moments of the little engine running.
I have found out this information outboard 2 stroke engines use the 50-1 mix to cut down on some of the waste oil and pollution that comes with a 2 stroke in the water. It is not to do with keeping the plugs clean as the jet size has more to do with this than the fuel mix. Engines run the best when the right mix is used. Changing the mix is not the way to go change the jets to get a rich or lean mix

I am not sure why folks think one engine type is more reliable than the next ? Build quality from the manufacture has more to do with reliability. In engines look at aircraft as the gold standard. Turbine, 4 stroke, last is the 2 stroke. The 2 stokes best points... simplistic and light weight. Very good power to weight ratio. Low build cost for the manufacture = good profit.
Look forward to hear the replies that will come. Kind Regards, Lou
Lou,

Oil/gas mix is important for lubrication, most of the 2 strokes I have had specified 50:1. Some bigger outboards had/have? oil injection, no need to mix.

Gas/air mixture determines power output. Lean, more air, runs really strong until heat builds up and it seizes, don't ask me how I know

Years ago there were high speed mixture controls. Best setting was rich until it ran a Little rough then lean it out just enough to get rid of the roughness, no more. Too lean, too hot, seize.

Present day motors have fixed high speed jets which must be changed to adjust the mixture. Slow/idle mixture, Generally about 1-1/2 turns out or until it stumbles on the rich side, then back just enough to smooth it out. I keep mine, both 2 & 4 stroke, on the rich side to avoid "stalling"

2 strokes are lighter for the same HP rating, simple, and in my opinion will last as long, maybe longer than a comparable 4 stroke. different strokes for different folks.

Paul T
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