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2017 BS4 NS 200 Acceleration Problem - Please Help!

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  • #1

    2017 BS4 NS 200 Acceleration Problem - Please Help!

    Hi Guys,

    I have been trying to find the issue for almost a year now. Many BS4 NS users have complained about the same. My Bike wont accelerate past a certain RPM and this RPM is different for different gears. Find information below:

    Gear 1, 2, 3: Smooth acceleration till readline
    Gear 4: RPM wont cross 9000. Speed hovers around 90
    Gear 5: RPM wont cross 7000. Speed hovers around 90
    Gear 6: RPM wont cross 6500. Speed hovers around 94

    ASC and local mechanics always wanted to go for my clutch plates and wanted to change them as they think clutch plates are the issue. But my common sense suggested me if clutch plates are worn out then RPM should go till redline and speed wont increase. But the RPM is getting stuck.

    Here are the things I have done yet the issue persists:
    1. Checked and cleaned carb, since it may be due to faulty slider mechanism. But the carb is fine as evident from gears 1-3 acceleration
    2. Replaced clutch plates. Yepp no mechanic wanted to proceed without changing them. :-(
    3. Replaced air filter.
    4. Replaced engine oil at timely intervals.
    5. Checked chain slack and the chain is well lubed.
    6. Wheels are spinning freely
    7. Replaced two spark plugs as they were clogged.

    Experienced people please help. I am also in contact with other NS users who are facing this issue and are still not able to solve it. This request is on behalf of everyone.
    Bajaj Pulsar NS 200 (2016 - 2017)
    Bajaj Pulsar NS 200 BS 4 (2017 - Present)
    Tags: None
  • #2
    Re: 2017 BS4 NS 200 Acceleration Problem - Please Help!

    Thread approved.

    Comment

    • #3
      Re: 2017 BS4 NS 200 Acceleration Problem - Please Help!

      Few things to check:
      1. You mentioned spark plugs were clogged. What is the condition of the new plugs and what exactly happened to the old ones? Spark plugs are self cleaning unless carbon is being deposited due to rich mixture /wrong heat range or oil burning. Please click a photo of both and show us. It could provide an indication on the health of engine.
      2. Mechanics mostly miss checking the diaphragm. Any holes, tearing could cause high rpm issues. Also, push the slide up with fingers when carb is out. Is it moving freely?
      3. Check the ignition coil condition, maybe you could ask the mechanic to swap it with another bike for diagnosis.
      4. If everything above is alright, it could be an issue with the exhaust system.
      It doesn't look like a clutch issue since the engine is not revving properly. Do let us know your findings, and if there are any other symptoms

      Comment

      • #4
        Re: 2017 BS4 NS 200 Acceleration Problem - Please Help!

        Originally posted by tripping_billie View Post
        Few things to check:
        1. You mentioned spark plugs were clogged. What is the condition of the new plugs and what exactly happened to the old ones? Spark plugs are self cleaning unless carbon is being deposited due to rich mixture /wrong heat range or oil burning. Please click a photo of both and show us. It could provide an indication on the health of engine.
        2. Mechanics mostly miss checking the diaphragm. Any holes, tearing could cause high rpm issues. Also, push the slide up with fingers when carb is out. Is it moving freely?
        3. Check the ignition coil condition, maybe you could ask the mechanic to swap it with another bike for diagnosis.
        4. If everything above is alright, it could be an issue with the exhaust system.
        It doesn't look like a clutch issue since the engine is not revving properly. Do let us know your findings, and if there are any other symptoms
        Thanks for your reply. I dont have the old spark plugs with me. I will take a picture of new ones and will post. They are more than 1000 km old now.
        About the diaphragm I did not inspect much since the engine revs happily till redline in first 3 gears. I will check again. I think I might need to access carb myself since I dont trust any of the mechanics. They have done more harm than good. Even the ASCs. Difficult to find a good mechanic for NS.
        Bajaj Pulsar NS 200 (2016 - 2017)
        Bajaj Pulsar NS 200 BS 4 (2017 - Present)

        Comment

        • #5
          Re: 2017 BS4 NS 200 Acceleration Problem - Please Help!

          I had kind of similar symptoms when my fuel injector got bad.

          Comment

          • #6
            Re: 2017 BS4 NS 200 Acceleration Problem - Please Help!

            Originally posted by EngineAbuser View Post
            I had kind of similar symptoms when my fuel injector got bad.
            His bike is carb not FI buddy. Issues seem like fueling is improper at high revs, most probably getting too rich

            Comment

            • #7
              Hello, does anyone know the solution to the problem

              Comment

              • #8
                Originally posted by ghadikolae View Post
                Hello, does anyone know the solution to the problem
                Hello friends, I changed the carburetor diaphragm, the problem was solved👍🏽👍🏽

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