50cc engine troubles, need some help...video inside.

[Kaneman]

Once I get the tools I need I'll probably start tearing the motor down to learn more about it and see if it needs a rebuild or anything internal. I'll get some good pics and post them up.
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Nexium Help

[Particle Man]

Originally Posted by Papa_Complex

Which makes me wonder if it's not blow-by and the rings are shot.

I didn't want to go there...

however, the good news is that it's not all that hard to tear down a 2-stroke motor

[Rider]

Originally Posted by Particle Man

I didn't want to go there...

however, the good news is that it's not all that hard to tear down a 2-stroke motor

2 stroke? It's a 4 stroke. Still easy to take apart though.

[Particle Man]

Originally Posted by Rider

2 stroke? It's a 4 stroke. Still easy to take apart though.

crud - I thought those little guys were a 4 stroke

my bad

still pretty easy (just not as much).

I'll go away now.

[Kaneman]

It doesn't look too hard to tear down, and I've got a couple of spares to practice on. The biggest problem with working on it right now is the bloody heat. Its 103 out there...I was dickin around earlier outside and started gettin dizzy. Can't hardly drink enough water to take it.

Think I'm gonna bring it into my office and work on it in here in the A/C in the next couple of days.
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SexyBarbie

[Particle Man]

Originally Posted by Kaneman

It doesn't look too hard to tear down, and I've got a couple of spares to practice on. The biggest problem with working on it right now is the bloody heat. Its 103 out there...I was dickin around earlier outside and started gettin dizzy. Can't hardly drink enough water to take it.

Think I'm gonna bring it into my office and work on it in here in the A/C in the next couple of days.

trust me on this: don't bring it inside and work on it where there's white carpet...

[Kaneman]

Originally Posted by Particle Man

trust me on this: don't bring it inside and work on it where there's white carpet...

haha, lucky me, I don't have a sliver of carpet in my entire house!
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The Cigar Boss

[was92v]

Originally Posted by Kaneman

Once I get the tools I need I'll probably start tearing the motor down to learn more about it and see if it needs a rebuild or anything internal. I'll get some good pics and post them up.

How will you know if it needs a rebuild?

A compression test is a good place to start. If you haven't done one on a bike, the 50 is a good one to try it on. Buy or borrow a gauge with a screw in fitting and find an adapter for that plug size if there is not one with the gauge. The type that you press and hold will work OK on that engine, just oil the rubber before you stick it in.
With the gauge sealed to the plug hole, pin the throttle WFO and kick it over until the reading stops going up.
It should be around 170psi on that engine. If it is below 160 it means you get to dig deeper. Otherwise you are good and don't need to open the patient up. If it reads low, take the gauge out and pour a teaspoon of oil into the plug hole and slow kick it through a couple of times then put the gauge back in. Take another comp test just like before.
If the reading is higher, it is rings and/or bore. If it doesn't change, check the valve clearances, adjust if needed and test again. if that fixes it, you are good, if it doesn't, the rebuild will cost more than the engine is worth.

[HRCNICK11]

This going to sound real dumb but make sure the slide opens when you twist the throttle. If its in backwards it will only open half way. Or if it has the wrong cable it will not open correctly.