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I took out the cylinder head and removed the valves for a careful cleaning and inspection. Taking them out was easy thanks to this video:


But putting them back in was a bit tricky, but possible thanks to this video:


Other than being very dirty with carbon deposits, the valves looked fine so I put the engine back together without replacing them. After that, the engine would not start. I even sprayed starter fluid right into the spark plug hole without any luck.

Frustrated and clueless as to why it wouldn't start, I began pushing down the kick start lever over and over in frustration when suddenly I heard a small sputter. I kept going and heard more sputters. The engine started to turn over a few times with each kick. Eventually, it started to run and the spark plug and intake manifold were dry afterwards.

So I guess I could have fixed it by simply cleaning the valves and the valve seats. At least I learned some new things. I never took apart an engine that much before.

Alright, I think it's fixed.

I checked the valves after alleyoop had suggested it. They were still set the same way as they were before these problems occurred. I also inspected every fuel line and vacuum line on the bike with no luck finding a potential cause for problems. I then cleaned and looked over the carburetor, but didn't see anything wrong with it.

The bike still continued to stalling at an idle and become oily on the spark plug and intake manifold. Not sure what else to do and not willing to take apart the engine to look for internal problems, I decided to try a new carburetor.

I installed the carburetor today and haven't had any idling or oily problems since. I got it for $25 on ebay, even came with a fuel filter and some fuel line.

I finally took a picture of that clear hose. I drained the liquid out of it, but it's not gas. I don't know what the liquid is from, how it got there, or what the part the hose connects to is. Can someone explain this part for me?

I checked out that valve cover vent hose and the air box. Surprisingly, I didn't see any oil or residues in the opening of that hose or in the air box. I haven't changed the oil in over 400 miles with no issues up until now, so I don't think there are any problems with excess oil.


I see a clear tube hanging down from a thing shaped kinda like a cylinder that's zip tied to the frame. The tube always looks full of gas. In fact, I assumed it was some kind of tube used to drain the gas tank. I'll try to take a photo of it tomorrow.

Yeah, it's not very oily, so it's probably something else. Also, from what I hear, engines don't usually stall if their spark plugs are getting oily.

A few hours after I took those photos the oily residue was dry. If it was really motor oil, I'd think it would still be wet to the touch. Now I'm thinking it could be from gas. I'll look over the carburetor. I have the carburetor jets soaking in carb cleaning fluid right now.

Yes, 1st web sales is the ebay seller I bought it from. My scooter is stock, so it should work great.