Question about 2009 Yamaha Vino Classic

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2009 yamaha vino 49cc scooter, (4 stroke) when accelerating from stop engine lulls(hesitates) before taking off

When accelerating from stop the engine lulls as though it is going to die(but doesn't die) then i open the throddle wider and it takes off but only slowly and gradually

Posted by Anonymous on

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Hi, Anonymous and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Pinholes or torn diaphragm.
6. Accelerator pump leaking or no output.
7. Plugged bowl vent or overflow.
8. Fuel level in bowl too low.
9. Restricted fuel supply passages.
10. Plugged jets or passages.
11. Worn or damaged needle or needle jet.
12. The enrichner valve not seated or leaking.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Posted on Feb 04, 2017

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Posted on Jan 02, 2017

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Hi, Anonymous and the usual suspects are:
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2. Air fuel mixture adjustment too lean.
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