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My yamaha stx 125 hesitates upon acceleration..specialy on 1st gear and in low speed.. i recntly expiriencing backfiring, ive visited a mechanic to adjust the needle and mixture to make it richer. an

The tip of the plugs turned black.. Its like it has been burnt on the tip.the seems to be ok..also the wirings.. Is it still too lean? What are the possible damage?.is there any damage on d engine?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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GM Elec
  • 1000 Answers

SOURCE: backfiring

The backfiring on deceleration is typically associated with a loose timing chain.

If you put a wrench on the harmonic balancer bolt, turn the balancer gently until you feel the chain tighten, then rotate the opposite way until it tightens, how far does is move.
If it goes more than an inch, it is getting sloppy. If it moves closer to 2 inches, it is worn out.
Try that first then let me know and we can go from there.
Good luck.
Regards,

Posted on Apr 08, 2009

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nrosenberry
  • 4 Answers

SOURCE: hesitates on acceleration

Does the car always hesitate during acceleration? If it ALWAYS struggles when it starts or ALWAYS hesitates on acceleration then I would say the issue is fuel delivery. If the problems are more intermittent and come-and-go then it could be an electrical issue.

I would start by changing the fuel filter. Changing plugs, wires, cap, and rotor are all good things to do as your budget will allow. I doubt you will have to change your injectors.

If you end up replacing any rubber fuel line, be sure to use the high-pressure stuff made for use on fuel injected cars.

I hope this helps! -Nick

Posted on Apr 10, 2009

udesh99
  • 97 Answers

SOURCE: Backfires in manifold on motor on acceleration. runs ok low speeds

Nornally reson for backfire is when intake Valve open Internal combustion in Cylinder. Pls Check Your Ignition Timing & Valve Timing. ( I think Your Timing Advancer is Defect )

Posted on Jun 01, 2009

  • 14036 Answers

SOURCE: bmw 3.0 x5 hesitation problems

sound like throttle position sensor.have it check out.also check air duct connected to mass air flow sensor and throttle body.if air duct is loose or off.it will cause severe hesitation.

Posted on Jul 22, 2009

  • 1201 Answers

SOURCE: 2001 Ford E150, V6. Stutter/hesitation upon

Have the throttle position sensor checked, might be faulty.

Posted on Oct 01, 2009

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