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2008 150cc Znen scooter. What causes it to bog down at 55-60 mph?

Accelerates up to 55-60 mph then boggs down and i have to rapidly twist throttle several times to get it to accelerate again

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  • Znen Master
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Hi, Ty and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in the fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor or intake seals.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Headlights melting Engine bogging down
Yahoo Groups
SportiqueScooters com Scooter Buyers Primer http://www.carlsalter.com/pdfs/Znen_ZN250T_D.pdf
Gy6 50cc 150cc Scooter Repair service Manual Download Manuals Technical

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on Mar 06, 2016

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Posted on Jan 02, 2017

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I need manual for 2010 ZNEN 125 T-F scooter.Please any information. Thank you


Hi, Miguel the vast majority of service, parts fiche, and owners manuals on the internet are "FREE" to download and all service manuals contain wiring diagrams in the back pages. The rest usually charge a modest fee around $10 and there is a handful of obscure, rare, obsolete, and very old models that are no longer or never were available, for these rare occasions I shall look on eBay and find the cheapest one available. Most of the manuals will cover your exact make, model, and year otherwise one will be provided that comes as close as possible to your bike and will have most of the same info that an exact manual would have. If there is no $ sign after the manual link it is free to download for viewing or printing. To download your manual please click on the blue links below. Good luck and have a wonderful day
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My 50cc scooter(chinese) hesitates at full throttle, almost like it wants to stall and then it kicks back in. Could this be a problem with the carburetor valve?


Hi, Randy and the usual suspects are:
1. Inlet system air leak.
2. Enrichener valve not seated or leaking.
3. Damaged or restricted fuel tank vent system.
4. Restricted fuel supply tract.
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For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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1 Answer

What causes bog down when accelerating?


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www.automotiveforums.com > ... > Cavalier > Cavalier Problem Diagnosis
I have a 1994 Cavalier 4cyl and it bogs down and struggles when I come from a dead and try to accelerate and sometimes when I get upto 55-60 mph it does it ...

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Bogs down when i accelerate


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