Question about 2004 Yumbo Dakar 200

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Yumbo motor scooter

Just got it for free.
It runs, but it will only idle. It refuses to rev beyond idle speeds. Any routes I should trouble shoot?

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Hi and welcome to FixYa,

Appreciate the direct "Ask Me".

Initially, pls confirm that it uses a two-stroke 50CC engine. Additionally, your description "It refuses to rev beyond idle speeds." could indicate several conditions:

  • throttle up above idle speed, engine stalls/dies - fuel related issue, fuel starvation, clogged jets, nozzles, too much 2T oil, contaminated fuel (water). Basically a carb rebuilt;
  • throttle up above idle speed, no change in engine RPM - mechanical problem, possible broken accelerator/throttle cable, stuck plunger in carb, detached needle valve;
  • throttle up above idle speed, engine backfires/dies - electrical issue, check CDI, stators, trigger/pulse, their physical state/mounting, electrical connections;
  • throttle up above idle speed, engine hesitates/flat spot - air/vacuum issue, check rubber coupling from carb to intake manifold, blocked or absent air filter.
Good luck and Thank you for using FixYa.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

Posted on Dec 29, 2008

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When i m using my bicycle motor the accelerator is not working properly because i think wire is bit pulled out bit so how how can i fixed

Posted on May 04, 2009

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Throttle housing needle jammed

Posted on Jan 27, 2009

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I had the same problem with my yumbo and just took the carb off and soaked it in gasoline for a couple days. i then blew all the lines and the carb out with an air hose. give it a shot it worked on mine. good luck, j

Posted on Jan 09, 2009

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