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Go Back   SailNet Community > On Board > Gear & Maintenance > Repair 4 hp two stroke ?
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Topic Review (Newest First)
04-20-2013 01:57 PM
dabnis
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
04-19-2013 10:44 PM
Lou452
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
04-18-2013 05:40 PM
dabnis
Re: Repair 4 hp two stroke ?

Quote:
Originally Posted by sww914 View Post
I was pretty sure that I was making a mistake when I bought a 20 year old 2-stroke Nissan 9.9 with almost no hours on it. I really wanted a new 4-stroke.
I was wrong. I am one of few around here who's engine always starts on the first pull. I am one of few who can both plane the dinghy with 3 people in it and be able to carry the outboard around by myself.
My only mistake was doubting my decision.
I recently bought a new 6HP 4 stroke Tohatsu for my fishing boat. The reason I bought a 4 stroke is that carburettor equipped 2 strokes are not allowed on Lake Tahoe. Some time back a bill was introduced to ban 2 strokes on any body of water that eventually ended up in a water supply. The bill was defeated, but not by much, IIRC. I wouldn't be a bit surprised to see that bill re-introduced again.

I have had many 2 strokes and would have bought a new one except for the above.

Paul T
04-18-2013 01:23 AM
sww914
Re: Repair 4 hp two stroke ?

I was pretty sure that I was making a mistake when I bought a 20 year old 2-stroke Nissan 9.9 with almost no hours on it. I really wanted a new 4-stroke.
I was wrong. I am one of few around here who's engine always starts on the first pull. I am one of few who can both plane the dinghy with 3 people in it and be able to carry the outboard around by myself.
My only mistake was doubting my decision.
04-17-2013 10:33 PM
Lou452
Re: Repair 4 hp two stroke ?

[QUOTE=dabnis;1017160]Now that you are a little more familiar with 2 strokes, perhaps you could find a good used one on Craigslist or equivalent?

This part of KY. is not a hot spot for boats. I might find one but the odds are not good. I am blessed to have sailnet mates to help me. Regards, Lou
04-17-2013 10:25 PM
Lou452
Re: Repair 4 hp two stroke ?

I did not remove the fly wheel as I felt like the spark from the under the fly wheel was good. I had unplugged some wires going to the coil packs that came from under the fly wheel. At that point I used a test light and it would flash bright and full with each pull. Even a slow gentle pull.
I think the removing the coils and putting them back on and cleaning the plugs that did not seem fouled made it better. The coils might not have been getting a good ground ? They are still over the Ohm range of 6-8 ohms that I found on the other boating forum. These coils both showed 12 ohms. A real electrician, not me checked 12 ohms. I can use an ohm meter like a novice. Understanding values not really.. 12 is half again 8 and 8 is 3/4 of 12 Seems like 12 ohms is way to high ? I put the coils back on and the spark was better.
Oil down the plug holes did nothing for the spark but it is a fine line that makes an engine go. Once she hit she got much better. She was a sleepy puppy. Now she is ready to play.
I have had some 2 stroke dirt bikes and 4 stroke I have no battle as to what is the best they both have a + and a -
Electronics are a mystery to me. I tip my hat to the ones that have skill. They get a good laugh at me but always help me to find the trouble. I try and I just stay at it long enough that I find the fault by will power.
It was my first outboard engine fix. I grew up on lake Erie and the inboard or inboard/ outboard is more my limited fixer upper
I wish I did not have to give it back but like I said learning about it was great reward.
Regards, Lou
04-17-2013 08:05 AM
downeast450
Re: Repair 4 hp two stroke ?

For future reference: Did you check for rust on the magnets on the inside of the flywheel? If they have a coating of rust on them it will impair the spark. Sitting around for a while can cause this. A cleaning with some emery cloth can perform wonders on these little 2 strokes.

Down
04-16-2013 11:31 AM
dabnis
Re: Repair 4 hp two stroke ?

Quote:
Originally Posted by Lou452 View Post
Easy come easy go. They want it back. I have it running in a 55 gal drum sounds good one pull to start it.
I pulled the coils out and checked the coils with a ohm meter. I found some info on this Iboat forum that gave values for the primary 1-2 ohms and secondary 6-8 ohms This engine showed 12 ohms on the secondary? As I said me and wires do not mix. I have know idea what I am doing.
I checked the spark when I put the coils back and it was a little bit better but not a bright blue but a strong yellow and shooting of the plug sides. I cleaned the plugs up this helped the "fire" still not blue.
I checked the compression once more both holes plugs out 60 lbs One of you said to do this It seemed to help the sound.
I noticed the mix Lean rich dials not balanced so I set them to the middle.
Pulled the rope a few times and the pay off came on pull 5-7
Now it will start in one if it is warm.
Lake test Sat I think
The motor has been recalled so it seems. Not a loss to me as it came to me for free. I now have a little bit of an idea what is going on and how to work on one. That's a plus
I wish to thank all of you that gave me an ear and some help Kind Regards, Lou
Now that you are a little more familiar with 2 strokes, perhaps you could find a good used one on Craigslist or equivalent?

Paul T
04-15-2013 10:40 PM
Lou452
Re: Repair 4 hp two stroke ?

Easy come easy go. They want it back. I have it running in a 55 gal drum sounds good one pull to start it.
I pulled the coils out and checked the coils with a ohm meter. I found some info on this Iboat forum that gave values for the primary 1-2 ohms and secondary 6-8 ohms This engine showed 12 ohms on the secondary? As I said me and wires do not mix. I have know idea what I am doing.
I checked the spark when I put the coils back and it was a little bit better but not a bright blue but a strong yellow and shooting of the plug sides. I cleaned the plugs up this helped the "fire" still not blue.
I checked the compression once more both holes plugs out 60 lbs One of you said to do this It seemed to help the sound.
I noticed the mix Lean rich dials not balanced so I set them to the middle.
Pulled the rope a few times and the pay off came on pull 5-7
Now it will start in one if it is warm.
Lake test Sat I think
The motor has been recalled so it seems. Not a loss to me as it came to me for free. I now have a little bit of an idea what is going on and how to work on one. That's a plus
I wish to thank all of you that gave me an ear and some help Kind Regards, Lou
04-08-2013 11:55 AM
dabnis
Re: Repair 4 hp two stroke ?

Quote:
Originally Posted by Lou452 View Post
The 4R77B makes it a 1977 ? The compression was 60 lbs The exciter coil must be good. It is what lights up the test light at the connection plug. I am not sure about a ground kill it must work from a point at the throttle. Thanks again, Lou
60lbs? Not sure what the spec is? but it sounds a little low? Maybe squirt a little light oil in the plug hole and try it again? I think you said you were getting a weak spark from each plug? If all the wiring reads good with an ohm meter you may have bad ignition coils, but that may be a stretch?

Let us know what you find.

Paul T
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