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i'm not sure about the manual, but it can help you
try these web sites:
second link:
yumbo 125cc workshop manual Google

Yumbo... | Answered on May 13, 2015

Not much information here but the first thing I would look at would be your ignition coil followed by your stator. It is more likely to be your stator (they can build up heat then cut out only to cut back in once temps have dropped ) but this is harder to check whereas the ignition coil is easy to get to and replace for not too much money. Never hurts to have a spare coil around.
Testing of the stator requires a mulitmeter and a bit more knowledge. Replacement of the stator is much more work than replacing the ignition coil.

2004 Yumbo Dakar... | Answered on Jul 31, 2013

I have had the same problem with my stepsons zip 50 and have done all the usual checks. The solution is from a piaggio technition. Take off the air cleaner and housing, start the scooter and bring it to the point where the engine dies. At this point spray easy start or a gasoline spray direct down the carb intake. If the revs pick up, you have a lack of crank case compression and the most likely reason is worn oil seals on the crankshaft. It sounds odd but the worn seals cause all kinds of strange problems.
Thats 2 stokes for you. Hope it helps, good luck

2004 Yumbo Dakar... | Answered on Jul 29, 2013

As far as I know, there is none. You might want to check if the choke lever is set to on because if it is, it will only try to start then die.

2004 Yumbo Dakar... | Answered on May 31, 2012

probly from the maker but cud be obselete--each companys different--search salvage yards etc-parts from other bikes may work--new ones can be made

Yumbo Dakar 200... | Answered on May 19, 2011

I have a couple of ideas what may help.
First I would think it was starving for fuel.Or maybe an unusual ignition system fault- So how do we find out?
Well-you could try checking the bike for spark immediately after the bike stops.
Remove the spark plug-Re-fit to the cap-place plug resting on metal where you can see it(DO NOT HOLD PLUG-HIGH VOLTAGE)-kick over & check for spark.If theres no spark-try a new plug but if the problem persists then the bike has a faulty ignition(coil,cap,plug,stator.ignition/kill switch,wireing)
I think it is more likely starving for fuel.
A faulty fuel tank filler cap vent or carby vent tube pinched or blocked.
To check the filler cap-ride the bike & when the problem just starts-quickly crack open the fuel tank filler cap to let air in/out. If bike runs ok then the cap is blocked.
To check the carby vents -just look at them & make sure none are blocked or pinched.They usually come from each side of the carby & one from the bottom(usually clear or semi-clear hoses).
I hope that this helps you with your problem.
Regards Andrew Porrelli

2004 Yumbo Dakar... | Answered on May 17, 2011

i have no idea i am looking for parts too

2004 Yumbo Dakar... | Answered on Jan 24, 2011

Hi and welcome to fixya,

Looks to me like a bad fuel-air mix.. You'll need to lean out your mixture. Try 3 turns out from full close. This adjustment is not the idle knob. Its a straight bit brass screw on the carbuerator that would look like a needle when you unscsrew it off.

Hope this helps

Yumbo Dakar 200... | Answered on Dec 29, 2010

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