2 stroke problems

[ooopseyesharted]

I have a 2002 yumbo 2 stroke 50cc.
I have had a hell of a time getting it running. Well, now it runs, but it has an irratic idle and after hard acceleration, it bogs and stalls. I have cleaned the carb a couple times already. I was just going to spring for a brand new carb, but I figured I would look for other guidance here before blowing more cash on this thing.

[ooopseyesharted]

I also wanted to add the list of items replaced so far.
1. Stator
2. Coil
3. CDI
4. Spark Plug (yesterday)
5. Fuel Lines and Filter

I am running amsoil 2 stroke synthetic oil. Just incase you need that info.
I was thinking about unhooking the oil pump hose from the bottom of the engine and running premixed fuel......do you guys think that might help?

[sussexscooterhead]

Have you checked the plug after doing one of your hard acceleration runs? It might help determine whether the bog is a result of a lean or rich condition.

What lead you to change the ignition components? And did it really make a difference? Now that you have it running have you tried putting the old parts back in to verify that they were in fact faulty?

Does the oil injector pump have a means for adjusting it and if so have you verified that it is set correctly? I would have said that doing away with the injector system was a good idea except that I read recently about how on the old Suzuki TS and TM series motorcycles converting to a pre-mix system was detrimental to the crank bearings so - without knowing for sure how it might affect your engine - I'd just recommend setting up the oil pump as best you can and sticking with it. Is it possible the injector system isn't compatible with the Amsoil? I know it's a good oil but has it ever ran well while using it?

Over thanksgiving I was helping a friend with an outboard motor that had a bad fuel shut off needle - the valve that is operated by the float to control fuel level in the carb. This was a Mercury engine with almost no hours on it. Is it possible that either the float level is incorrect or the needle doesn't seal any more? This would tend to flood the engine.

Sorry if you've already covered these points, just trying to get a feel for your situation.

[ooopseyesharted]

I was also wondering about the amsoil because it is ALOT thinner than you regular 2 stroke oil. Also, I did remove the plug this morning and it was black. i going to get a couple replacement plugs. Also, I have never been tols that the oil pump required/had an adjustment. do you know how I could do that? I was also told that the "preset" gap of.030 was too small. I was told to gap to .050 by a few different people.

[sussexscooterhead]

I can't tell you for sure whether the oil injection pump has an adjustment or not but it would make good sense for it too. I'm pretty sure that if you look closely at how the cable routes to the small lever actuating the pump you'll see if there is one type of adjustment of another. That's assuming the oil injector is actuated by a lever but generally, the cable coming from the throttle splits into 2 cables - 1 that goes to the carb and 1 and that goes to the oil injector.

I did a bit of checking and it seems Amsoil is recommended by some to be used as an injector oil so it must be more or less ok. Does the bottle you have say it is suitable for injection systems? Maybe they have different products for different applications.

All that being said, even if the injector is supplying waaay too much oil I'd be surprised if it would cause the engine to stall.

Can you check the fuel needle in the carb? It's kind of fiddly removing the carb and setting it up such that you can see if the fuel is shutting off once the float bowl is full but if your plugs are coming out black and wet you've got to get to the bottom if it one way or another. You'll have to bypass the vacuum operated fuel valve and connect the carb directly to the tank.

As for the new plugs, the stock gap will be fine. A few thou here or there isn't going to cause the engine to stall.

Is your air filter clean? And have you ruled out a bad intake manifold? I trust you've heard of them developing air leaks?

Did you buy this scooter in non-running condition?

Good luck.

[ooopseyesharted]

I was not running when I bought it. ($50). It had no spark. The intake manifold does appear to have a crack in the underside of it. I wanted to replace it a while back, but I am having a hell of a time finding one.

[ooopseyesharted]

well the scoot runs now, but it does bog a little when I take off from a light.
I still need that rubber hose between my carb and intake. Noone has one.

[lancef3113]

concerning your intake and rubber hose..

Does your carb go forward (infront of the cylinder, or backwards (towards the rear wheel)

i have a couple of extras lying around of both these kinds of manifolds, and the rubber boot...Let me know abd i could probably help you out

[beamme11]

Hi guys.
I just bought a used E-ton beamer 11.
it has approx. 5000 miles on it.
It was hard starting, I replaced the battery, was starting fine for a few days, then suddenly went completely dead. does it sound like ignition switch? Do you know of a website that shows where the parts are located on the scooter and how to check them?
thank you very much for all your info.

[motomech]

Dec 2, 2006 15:43:48 GMT -5 ooopseyesharted said:

I have a 2002 yumbo 2 stroke 50cc.
I have had a hell of a time getting it running. Well, now it runs, but it has an irratic idle and after hard acceleration, it bogs and stalls. I have cleaned the carb a couple times already. I was just going to spring for a brand new carb, but I figured I would look for other guidance here before blowing more cash on this thing.

Year? Mileaqge?

Low-speed circuits in the carb are partialy obscured/dirty.

See;

Carb cleaning 101 in the Tips and Tricks section.

After correct cleaning is completed, set low-speed mixture adjustment using the "idle drop" method.

What does the inside of the fuel tank look like?
It should be clean and shinny.

[ooopseyesharted]

I sold that scooter about a year ago.
I replaced my carb and it ran like a dream.
My friend needed a vehicle to ride because he lost his job and didnt have a ton of money for insurance etc. That reminds me, he owes me 50 bucks....LOL