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My yamaha cygnus x 125 (2004) scooter back fires

When I first start my yamaha cygnus x 125 (2004), it backfires and got to keep revs on at a stop or stall. It is fine after a mile or so. Whats going on please?

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The motor might have jumped timing or bad spark plug or both mabe even the float is jammed

Posted on Mar 30, 2014

  • kevin bleasdale Mar 30, 2014

    thank you, it was the spark plug. I have now changed it and no more problem. Thank you.

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Hi, I have a 2012 Yamaha Cygnus X 125, and won't start, sometimes fires up straight away. No spark. Please help


Hi, Lorant and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting, leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
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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