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Sputtering

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  • Sputtering

    Hi Guys, lately I've been facing a problem on my 2 and a half year old P200. The bike sputters at lower rpms while climbing up the rpm. Lets say I change to 3rd gear and the bike is pulling from 3k which is when the bike sputters like mad as if its gasping for air, as soon as the revs start increasing, at around 4k the sputtering disappears. As a result I also loose out on low end torque. Now the obvious pointers were :-

    1. The AirFilter - Which was cleaned , and so was the air filter box whatever was possible from the lil gap.

    2. Spark plugs are 6k kms old. Was cleaned, gap checked and put back.

    3. I spent around 3 hours testing A/F mixtures to see if this could be the issue. In vain. Then I thought maybe I got it wrong, so told the PBK mech to re-tune, nope, no improvement whatsoever.

    4. My tappets were checked and reset.

    5. Tank was cleaned.

    Although cruising is not a problem and I did finish a 200km trip on friday this is proving to be bad in the city.

    Now the mech did point me out to something new. He said, it could be that my Clutch plates are worn out. Now my question is, has anybody experienced sputtering when the clutch plates are worn out? Any correlation? My clutch plates ARE worn out, but I wana know if there is actually any co-relation b/w the two.

    Secondly, what else could it be?
    sigpic

    Abstainer: A weak person who yields to the temptation of denying himself pleasure.

  • #2
    Query Approved.
    :)

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    • #3
      Thanks Aryan!
      sigpic

      Abstainer: A weak person who yields to the temptation of denying himself pleasure.

      Comment


      • #4
        Dude, some water might have seeped in the carb. Have you put the bike in the rains? Since you have not mentioned that among the things you did, it's worth cleaning the carb anyway.
        DoN\'t LivE tO DiE, dIe tO LiVe

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        • #5
          Yeah, I guess the last resort would be to open up carbs although I must say I haven't ridden or parked in the rains whatsoever. I will try cleaning up the carb next. Thanks Pranay
          sigpic

          Abstainer: A weak person who yields to the temptation of denying himself pleasure.

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          • #6
            couldn't be a carb prob since sputtering is only in lower rpms..if there was water,there wud be sputtering at every rpm..
            If U haven't Seen GOD, U haven't gone fast enough

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            • #7
              Originally posted by silver_falcon_46 View Post
              Yeah, I guess the last resort would be to open up carbs although I must say I haven't ridden or parked in the rains whatsoever. I will try cleaning up the carb next. Thanks Pranay
              Check the main jet. If all ok then check another carb on the motorcycle. If byke runs smoothly then the problem is with Vaccum slider and the carburetor bore which is leaking vacuum. After sometime it will become worst. The sliding vacuum throttle body is fitted with rubber diaphragm check it's OD and carburetor has bore for the slider so check the ID, micron diff. kills the RPM I have found this kinda problem in few byks at my workshop. If u want reference to know the spare then mail me at [email protected] I will send u the pictorial data.
              "CorePower"
              Motorcycle Performance
              Pune

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              • #8
                Buy a carburettor spray in JC road and dismantle the carb and clean it, possible issue is one of the circuits blocked.
                "Engine tuning is not an exact science, but with some practice and patience you'll get comfortable with your skill and be able tune for any conditions mother nature throws at you"


                Still the Boss -- RX 135

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                • #9
                  Is the problem solved, dude?
                  DoN\'t LivE tO DiE, dIe tO LiVe

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                  • #10
                    @ silver_falcon-
                    Pulsar don't have tappets. It has Valve (IN/EX) only and timing chain for valve operation.
                    Bullet has got tappet coz it works on push rods to lift up the valve (IN/EX)
                    "CorePower"
                    Motorcycle Performance
                    Pune

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                    • #11
                      Originally posted by Chinmay Dangre View Post
                      Pulsar don't have tappets. It has Valve (IN/EX) only and timing chain for valve operation.
                      Now thats news to us
                      All Indian 4-strokes have tappets, except the Comet GT250, since its DOHC.
                      sigpic
                      [email protected]

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                      • #12
                        Originally posted by Joel View Post
                        Now thats news to us
                        All Indian 4-strokes have tappets, except the Comet GT250, since its DOHC.
                        Valves and Tappets both are different spares. They may look same.
                        Valves are in the head and tappets are inside the engine, the engine which has got cam internally like old fiat or bullets etc.etc.. cam presses the tappet, tappet pushes the push rod then rockers and last valve.
                        In DOHC or SOHC cams are directly pressing valves.
                        http://www.cam-shield.com/acatalog/f...et-engines.jpg <<refer that pic u will get it. There are many types of tappet. flat, roller, flat cylinder etc. etc.
                        Last edited by Chinmay Dangre; 07-15-2009, 12:16 AM. Reason: need to post the link of one pic
                        "CorePower"
                        Motorcycle Performance
                        Pune

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                        • #13
                          Thanks for enlighting me sir.
                          So you saying, pulsars do not have tappets? HOw are valve clearances set then? What drives a rocker arm to the valves then?
                          Any SOHC and even the most modern DOHC engines have tappets. However most DOHC engines have shims to set tappet clearance and directly operate the valve via a valve bucket.

                          Your theory is a little off.
                          valves are in the head and tappets are inside the engine?
                          Which means the valves are outside the engine?? ..lol
                          sigpic
                          [email protected]

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                          • #14
                            ^You take his case. I ain't gonna interfere

                            @silver_falcon_46: Had the same issue on my Unicorn. Dismantling the carb and cleaning the carb thoroughly yielded results. Apparently, some grime had clogged up the innards.
                            I'm normally not a praying man, but if you're up there, please save me Superman.

                            -Homer J Simpson

                            sigpic

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                            • #15
                              Originally posted by Joel View Post
                              Thanks for enlighting me sir.
                              So you saying, pulsars do not have tappets? HOw are valve clearances set then? What drives a rocker arm to the valves then?
                              Any SOHC and even the most modern DOHC engines have tappets. However most DOHC engines have shims to set tappet clearance and directly operate the valve via a valve bucket.

                              Your theory is a little off.
                              valves are in the head and tappets are inside the engine?
                              Which means the valves are outside the engine?? ..lol
                              I guess ur right my theory is stone age. tx for sharing info with me.
                              "CorePower"
                              Motorcycle Performance
                              Pune

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