Oily Spark plug

I have a 2 stroke 49cc engine. I'm very new to this, and I didn't assemble mine but bought it second hand and am trying to learn from here.

The engine was very new when I bought it, maybe had run 1 gal. I ran it for about a week (another gal.) on the recommended 25:1 oil to gas mix, then it started to sputter and die. The spark plug was super oily and gross and oil was dripping from the exhaust. Also, there was some oil on the air filter. I cleaned the plug and cut it back to 40:1. It ran fine.
A week later it started to jerk and died again. The plug was very oily again, but no drippage from the exhaust, so I think it was a little better. I cut it back to 50:1 and put in a brand new plug (NGK B7Hs) gapped at .025. I changed the air filter. I used super unleaded gas and Motul 800 2T synthetic oil and ran it for another week and the plug is still looking really oily. I cleaned it and it has been running fine. It hasn't died yet, but it seemed to be getting a little jerky again today though.
I have no idea how to adjust the e clip in the carb, which I've heard other people talking about, if that would make a difference. I don't know if that is simple to do, or if that would be a possible fix. Other than that I have no idea how to keep the plug from getting oily. I would greatly appreciate any help that can be offered.

Ok check this thread out.. It should give you all the info you need about adjusting the clip


Carb needle clip settings

o_O

erm... no - that's part of the float mechanism, there's usually little need to mess w/it and it doesn't effect yer mix at all. Worst case is if it's bent down too much you'll just "run out of fuel" at wide open throttle, bent up too much and the float can hit the primer pin and not seal completely - making a puddle under yer bike as fuel pours outa yer carb lol.

The E-clip and it's setting is usually a fuel/air adjustment reference and it's to be found on the needle inside the carb's slide;





Moving the clip "up" (towards the flat end) leans the mix (more air/less fuel), moving the clip down (towards the pointy end) enriches the mix (less air/more fuel). Sounds like yer runnin' rich, no surprise lol - try the clip on the second notch down from the top and work from there.

Hope that helps

edit: BTW - when reassembling the carb, there's a lil pin on the inside of the carb that needs to line up with the slot on the slide, else it wont go back together/you'll break it/it'll stick;

Excellent advice and great photos Mr. Awake.

__________________
If it ain't broke, and you mess with it long enough, it will be.

The "E" clip is also known as the "C" clip. The float adjustment arms are called just that, and have not too much to do with the carb other than keeping the float in the proper range of operation.

Anyhow, I think you are running a little rich fuel to air wise, not gasoline to oil wise.
Move the clip UP a notch as stated above, not DOWN as stated above the above...

__________________
If it ain't broke, and you mess with it long enough, it will be.

Not quite true. Raising the float level will richen mixture and versa visa. Also note that raising/lowering needle only effects low end. For WOT the float level and jet size matter. Since changing jet is a pain it is much easier to bend the float prongs. Good idea to measure where they were when you start so you can get back to original setting if that's not the problem.

It is true that if level is too high carb will leak and if too low will starve. Then it's time to get out the tiny drill or soldering iron and play with the jet.

Much appreciated everyone! I'll be trying that out soon, and will let you know how it goes. This site rocks!

P.S. What's WOT?

WOT = wide open throttle I assume I wondered for quite a while myself. I don't doubt much advise here but I gotta wonder how the level of fuel in the bowl is gonna make a difference in lean...I saw a thread on adjusting the idle screw with the same result...idle speed and lean are like the difference in child support and alimony both are wrong in excess.

Yar, WOT = Wide Open Throttle lol, took me some time to get used to that as I've always known it as Wall Of Text...

Not that I tend to ramble on and on or anythin'...

You would be wise to doubt much of the advice here as about 2/3 of what you read on the net is bogus. (NET=Not Everythings True). In fact you should independently verify anything I say.

I find it amusing that many think the needle clip has any effect on open throttle ratio at all but are clueless about the influence of fuel level. It's also entertaining to see how many think the idle SPEED screw has any effect on ratio. These are generally the same guys who say adding more oil to the gas makes it "richer" or runs cooler. In fact the opposite is true.

Unfortunately most tend to believe advice from those they adore rather than those who are right. Often they are victims of individuals who profit from gullibility. Often just "the Blind leading the Blind". IMO people deserve the consequences of their choice though.

As far as the float, the closer fuel level is to the opening in the carb the more pressure is exerted forcing more fuel through the jet in a given period of time (richer). A simple 5 minute experiment is very convincing. I personally didn't appreciate how much effect the level had until trying it myself.