Ot-Question on 2 stoke engine

[JIPJOBXX]

I have a little Honda 50 Moped and it will start right up and run great till I take the choketo the open position and it will continue to run but soon the motor will die. I know the gas mix is oft could this cause this to happen? Other than that it runs great and the gas filter is clean and the gas line running the carburetor is clear. Need some advice on what maybe causing this problem. Like I said it runs great when the choke is set but after I move it to the run position it runs for a short time and then seems to run out of gas. Thanks Jon

Edited January 4, 2011 by JIPJOBXX
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[1940plymouth]

I don't know if your Honda 50 is the same as the one I had, but mine was a 1966 Honda 50 that ran on regular gas, no mixture

[alan32433]

Jon,

You have an air leak somewhere in the intake system causing the engine to run lean. Setting the choke of course causes more fuel to be picked up and the engine will run better. On a two stroke, if you run it like that you can cause damage to the piston and rings because not only is it running lean on fuel, it will not be getting the correct amount of oil into the cylinder.

The best thing to do is take a spray bottle of water and while the engine is running, spray all around the intake and see if while spraying water, the engine seems to miss or run differently. You might also try propane (not lit of course). If the engine misfires at some area, you are sucking the water into the cylinder from the air leak, and hopefully you will be able to pinpoint the leak like that. Keep in mind the two stroke actually sucks gas/air mixture into the cylinder under the piston where the oil lubricates the lower end. On piston down stroke, the mixture is pushed through ports to the upper part of the cylinder where ignition occurs. That means your air leak could also be where the gear box case mates together in the middle or even at the bottom of the cylinder where it mates to the case.

Good luck and don't use gasoline in the spray bottle. It will definitely show where the leak is but.....boom is a likely result.

Alan

[Plymouthy Adams]

clean the crud out of the exhaust pipe

[old stovebolt]

I have a little Honda 50 Moped and it will start right up and run great till I take the choke oft and it will still run but soon die. I know the gas mix is oft could this cause this to happen? Other than that it runs great and the gas filter is clean and the gas line running the carburetor is clear. Need some advice on what maybe causing this problem. Like I said it runs great when the choke is set but after I take it oft it runs for a short time and then seems to run out of gas. Thanks Jon

The Honda 50 is a four stroke engine, not a two stroke.......oops... it uses straight gasoline - not a gas / oil mix. That could be the problem.:D

[Don Coatney]

I know the gas mix is oft

Fix the oft (what ever that means) first.

Why would you post this question with a known problem?

You should fix the known problems first and then ask questions on the unknown problems. Sorry if my answer is blunt and rude but that is the way I would do it.

[Don Coatney]

The Honda 50 is a four stroke engine, not a two stroke.......oops... it uses straight gasoline - not a gas / oil mix. That could be the problem.:D

Good point! One should first know what they are working on.

[JIPJOBXX]

I expect some type of apology as here is the specs for my so called four cycle engine and notice its states two cycle!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I may not be smart but some people here just think they know everything about everything!!!! That being said check out the picture!!!!!!!!!! Sorry my mistake its two stoke engine and I think when I went to school that ment two cycle or is a two stroke engine a four cycle engine?http://i2.photobucket.com/albums/y4/1942dodge/img057.jpg

Edited January 4, 2011 by JIPJOBXX

[JIPJOBXX]

Stovebolt some times some people should not engage there mouth befor there brains!

[JIPJOBXX]

Sorry but I have never worked on a Honda 50 PA 50 Hobbit befor and so that's why I ask this question about what to look for? Guess if I was born with all the answers to all the questions of the world I would be one pretty smart person but I'm not!!!

[JIPJOBXX]

Oft:Antonyms: infrequently, little, rarely, seldom

[mikesinky]

sometimes if you use the wrong mixture or even a different type of oil other than the brand of the machine it will gum up your carb and let it run a little but not full throttle. i have fixed alot of people weedeaters that have this problem. taking the carb apart and soaking it in carb cleaner usually works for me. i use the gallon kind of carb cleaner at napa the spray can stuff doesnt do the job all the time soak it and put a new kit in and see if it dont help.

[807kirby]

or the carb may be dirty? not allowing enough fuel once choke is off. I have seen plenty of mini bikes with this problem! You need to blow out all passages in carb with compressed air.. Just a thought

Bruce

[JIPJOBXX]

Here is my two stroke engine!

Opps on this one I know it a four stroke!

Edited January 4, 2011 by JIPJOBXX
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[Don Coatney]

I expect some type of apology as here is the specs for my so called four cycle engine and notice its states two cycle!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! I may not be smart but some people here just think they know everything about everything!!!! That being said check out the picture!!!!!!!!!! Sorry my mistake its two stoke engine and I think when I went to school that ment two cycle or is a two stroke engine a four cycle engine?http://i2.photobucket.com/albums/y4/1942dodge/img057.jpg

I really do not know everything about everything. Do I really need to submit an apoligy here?

[lanny haff]

some one said the muffler is plugged. Good possibility , Takit off + seehow it runs!

Lanny

[40plyrod]

I would also check the passages and jets in the carb. I once had a bike that did the same sortof thing and found that the gas had varnished up in one of the jets from sitting to long with gas in it. Now I always drain the float bowl on my bike if it's going to sit for any length of time. I'm not saying thats the problem but maybe a place to check.

[JIPJOBXX]

Oh well if the shoe fits one hast to wear it and sometimes eating crow is really tuft. Now as far an apology no need for that as just remember every one make a mistake sometime. Now Muffler good idea.

I do have an idea of what may be happening but that will require a trial and error program. The main gas cut oft vlv has three positions and I think it might be broke or not opening enough to allow enough gas into the carburetor to let it run at full speed. So I plan on taking oft that valve and replacing it with a standard two position vlv. Well I will let everyone know what happens? I would like to replace it with a NOS one but where do I find one for a 1978 Honda 50?

[james curl]

I work on a goodly number of lawn mowers and weed eaters, some are 4 stroke and some are 2 stroke. The gas that we now get with 10% ethanol will cut the finish off of the carburetor and stop up all of the fuel transfer ports in the carburetor. You will have to pull the welsh plug in the body of the carburetor to open up the transfer and main high speed passages. Remember after you get it to running right again to always turn the fuel off and run the carburetor dry before storing it for prolonged periods.

[Plymouthy Adams]

4 days now and this was the first thread that asked a question of any merit and even if it is not mopar and now look at the way it has turned out...I have work a many of these little scoots...DO...check out the exhaust..will sit and putt with a clogged pipe..won't pull itself off a piece of chewing gum..SECOND..regardless of the fact the sparkplug will fire blue out of the cylinder..I gurantee you a oil fouled plug will not spark under comprression..another common trait of a 2 storke..

[james curl]

It needs to jump a large blue spark to run, not some little white spark.

[Don Coatney]

One thing I normally do is find a forum somewhat related to stuff I work on. As an example if I am working on my lawn mower I go to the lawn mower forum and post questions. If I am working on my TV I post the questions on a TV forum. If I am working on my Ford truck I post my questions on the Ford truck forum. I may post the results here on this forum of what I find on other forums just for general information. I just googled "Honda 50 PA50 Hobbit forum" and got 1370 hits so I do believe there is a good forum for what you are working on.

The other thing I do is correct known problems prior to asking questions on any forum. If I suspect what may be a problem I check it out prior to posting a question about it. As an example if I suspect there is a problem with the fuel shut off valve I would disconnect the fuel line at the carburetor and do a flow test.

You may not like what I have just posted but it is not an attack on you. It is simply a roadmap of how to fix the problem with your Honda.

[Adam H P15 D30]

I had a Puch (aka puke) that I got after it sat for years. Same issue....... After cleaning the carb it would not run with choke off. I still had the air filter off for various reasons. I found that without the air filter, it would run too lean with the choke off. FWIW.....

[alan32433]

Jon,

I still think you should look for an intake leak. Carburetor could be the problem but you have to take that off and it involves a lot more work. In later years I've learned to check the easy stuff first and if I don't find the problem, move to the next easiest but valid possibility. The spray bottle with water is a pretty easy check.

Alan