Running problems: chinese 48cc

[jocoman]

I've been having major problems but I now have the bike running tho not well.
I busted up the magneto, so I have a new coil and magnet in there. The tolerances between magnet and coil are very tight. anyways, it starts up.
I can run it down the street and power is not too bad. I slow down and it stalls and is very hard to start. I con only start it again by removing the plug, wiping it off, and then put it back in.
The plug is black and i would say wet.
So what's wrong?
maybe the magneto gap is not perfect? Maybe it's a carb problem?
Any suggestions?
Thanks
Jimmy

 

[srdavo]

hmmm....sounds carb related. like it's flowing too much fuel into the engine.

does your carb float still float?
does the needle valve shut off the flow of fuel in your carb?

 

[jocoman]

I'll check that first.
I guess just take the float out and see it if does right?

 

[srdavo]

yes.... a leaky float will have fuel inside of it.

while you have the bowl off, you can check the needle valve.

good luck

 

[BlueCollarBikes]

When it dies, does it just die ( like some one throw a switch in the off position ) or does it die Slowly losing power.
Also
how's your mixture,Old, 25 to one ?


BlueCollarBob

 

[jocoman]

I believe the float and needle valve are fine.
When it dies it just cuts out totally. I reworked the magneto and it is pretty easy now to get it started. I also looked at the spark as I pull the pull starter and the spark is white.
Not sure what to try next....
it now is cutting out while idling. it idles for about 60 seconds then dies. Or i take it out and go about 400 yards and then it dies. looks to me like it is chocking. but why?
where to go next?

Thanks everone!
Jimmy

 

[alex]

Is your gas cap venting properly? It could be creating a vaccum and not allowing fuel into the engine after running for a little while.
Maybe the reason it is working when you take the plug out is because you are giving it enough time to put fuel back into the carb.

 

[jocoman]

I would say the problem is too much fuel as the plugs are black and wet looking.
Why I don't know....

 

[BlueCollarBikes]

If the feeling is more like Some one threw a switch and the motor dies I would look at your electrical .
.
Re check your wire connections .Temporarily Dis connect kill switch .
Also check your Spark plug wire connections going to the plug and cdi.
blue spark is a nice thing.

BlueCollarBob

 

[Mountainman]

more blue in that spark ???

The tolerances between magnet and coil are very tight

maybe the magneto gap is not perfect?
Jimmy

concerned about -- very tight ?

should not be touching
a little gap in there is required
perfect setting is what makes your spark strong

you mentioned white spark
wondering if we shouldn't have more blue spark in there ???

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