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White smoke from exhaust please help

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  • White smoke from exhaust please help

    I own a Bajaj Discover 100 CC. It is just 9 months old. Suddenly I noticed a weird problem like " when i drive at full throttle after sometime i notice a huge amount of WHITE smoke coming out from the exhaust and then when i slow down the bike shuts down and doesn't responds for a few minutes" ( electric , Kick nothing works) after some time ( 5-6 mins) it starts normal without any smoke and runs fine. Mainly it happens when it is above 80kmph . I told the SVC people they took my bike and serviced but the problem remains. now i have forcefully given them the bike and asked to fix the problem . they said the oil seals are broken and needs to be replaced.
    I am worried as i have searched some threads where this symptom indicates " worn engine / worn piston ring / Worn cylinder walls. i told them these too but they said no its only the problem of broken oil seal.

    P.S : sometimes i found some oil is on the gearbox cover and where i park my bike there sometimes some liquid drops and the surface became white due to that drop. ( it indicates that my oil seals are may be broken)

    My question is can only the broken oil seals causes white smoke? please advise. Thnx.
    sigpic

  • #2
    Query Approved

    This shows an improper run-in since your piston rings have given up. Thats the reason for the white smoke.
    Advice is a form of nostalgia.
    Dispensing it is a way of fishing the past from the disposal, wiping it off, painting over the ugly parts and recycling it for more than it's worth.

    Antz Travelz!! | South India Exploration Ride | Leh Triplog (Work in progress)

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    • #3
      Originally posted by antz.bin View Post

      This shows an improper run-in since your piston rings have given up. Thats the reason for the white smoke.
      quite possible.
      But oil burning (which causes white smoke) can also be caused by failed valve guides.
      @ Thread Starter,
      How much your bike has run?
      I think your bike is still in warranty, so claim it. They won't be able to know how you run-in'ed your bike.
      http://www.facebook.com/ateesh.kumar

      Comment


      • #4
        i am worried and confused. tomorrow i will be getting my bike back and will test. if the problem persists what to do? will it be under warranty? as It is only 9 months old and run only 7500 KM. and if not covered under warranty then what will be the approx cost to fix it?
        Last edited by reachsamik; 06-28-2012, 11:06 PM.
        sigpic

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        • #5
          technically speaking, oil seals are not covered in warranty... eitherways iven if it is, only the cost of spare will be discounted. the labor will still set him back by 1000 bucks...

          as antz said, piston can be a probable cause. but at just 9 months, it is rare. better take a sound technical person with you and ask the engine to opened in front of you... only then you will be able to differentiate

          happy TROUBLE - SHOOTING
          Suffering from Parked Motorcycle Syndrome

          Cant ride ? read this..
          http://MechMarvels.wordpress.com

          Repair manuals for Hero honda Hunk
          https://www.xbhp.com/talkies/do-your...eneration.html

          Comment


          • #6
            Well I got my bike today. The SVC people did'nt asked me to pay any charge. when i asked the mechanic about what he did, he replied that the problem has been fixed but did'nt explained what was the problem.Later i inspected that the engine was opened as the upper part of the engine was dripping oil. Some tuning was done. As i was in hurry to reach to my office i could not managed enough time to test the bike then. in the evening at home i tested it and found after some hard revs that it is still emitting that bloody smoke .
            My problem is still not fixed. they took my bike for 3 days and couldn't fix the problem. i think i will have to endure the pain of this smoke though it only comes at speeds higher than 80 and i usually don't drive at that speed unless any body with splender / platina / etc( l100CC bikes) comes near me.

            I want to know if i continue riding with this problem what can happen as i am out of money right now to fix this if the job takes more than 1000 bucks.

            My mileage is also like 50-55, even in Highways after driving almost 137 kms in almost constant 50-60 km/h i got only 58 kmpl.

            I am damn frustrated with this bike. if anyone can throw some light in this issue i will be thankful.

            T.Y
            Samik
            sigpic

            Comment


            • #7
              Ok. I just want to know if i ask SVC people to open my bike engine head and just examine what is wrong/ is it busted valves? problem with valve guides or oil seal broken or piston ring worn out or something else will they do it without charge?
              and if i do it from outside what can be the cost of the only inspection?
              sigpic

              Comment


              • #8
                Can't say about the svc but anything upto 500 is ok at the outside mechanic excluding cost of gaskets etc.
                I still insist you the warranty thing.
                http://www.facebook.com/ateesh.kumar

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                • #9
                  Originally posted by reachsamik View Post
                  Ok. I just want to know if i ask SVC people to open my bike engine head and just examine what is wrong/ is it busted valves? problem with valve guides or oil seal broken or piston ring worn out or something else will they do it without charge?
                  and if i do it from outside what can be the cost of the only inspection?
                  Low RPM occasional smoking is caused by Valve stem seal leak..it will be noticed at starting more than in running....If the smoke is at higher RPM, then it is the engine oil escaping through the Piston Rings,into the combustion chamber...mostly due to rings/bore wear.
                  Last edited by psr; 07-04-2012, 11:04 AM.
                  When Was The Last Time,You Did Something For The First Time.

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                  • #10
                    I noticed today that the smoke is not that huge as previous. The smoke now is somewhat noticet at higher rpms. Thou i have nt tested it by riding it above 80s . I parked my bike on main stand and rev ed it hard . After some hard revs the smoke is coming and its not that whita as i noticed earlier while real riding. I took my bike to the svc cntr and showed the smoke. They said its normal. In that rpms this kind of smoke comes out.
                    Is it true as i did nt noticed it when my bike was new.

                    Sent from my LG-P500 using Tapatalk 2
                    sigpic

                    Comment


                    • #11
                      Originally posted by reachsamik View Post
                      I noticed today that the smoke is not that huge as previous. The smoke now is somewhat noticet at higher rpms. Thou i have nt tested it by riding it above 80s . I parked my bike on main stand and rev ed it hard . After some hard revs the smoke is coming and its not that whita as i noticed earlier while real riding. I took my bike to the svc cntr and showed the smoke. They said its normal. In that rpms this kind of smoke comes out.
                      Is it true as i did nt noticed it when my bike was new.

                      Sent from my LG-P500 using Tapatalk 2
                      wait for some days there may be some oil in the exhaust it takes some time before it becomes completely dry.
                      2030 " we used to ride petrol motorbike and you can not even afford one drop of it"

                      Comment


                      • #12
                        Originally posted by psr View Post
                        Low RPM occasional smoking is caused by Valve steam seal leak..it will be noticed at starting more than in running....If the smoke is at higher RPM, then it is the engine oil escaping through the Piston Rings,into the combustion chamber...mostly due to rings/bore wear.
                        PSR sir,
                        Think its the right place and time to mention my issue.
                        My Hunk(2008 model, 23k run) also produces heavy smoke on high rpms and I'm topping up the oil once in 400-500 kms
                        Can the bore/rings can go kaput so early?
                        I've read that worn valve guides can also cause this, can that be the reason for my issue?

                        P.S - I'm getting 40kmpl average in Chennai city riding. I'm not sure if the bike has been run more than 23k and how it has been ridden before, as I am the second owner of the bike

                        Comment


                        • #13
                          Originally posted by SatSon View Post
                          PSR sir,
                          Think its the right place and time to mention my issue.
                          My Hunk(2008 model, 23k run) also produces heavy smoke on high rpms and I'm topping up the oil once in 400-500 kms
                          Can the bore/rings can go kaput so early?
                          I've read that worn valve guides can also cause this, can that be the reason for my issue?

                          P.S - I'm getting 40kmpl average in Chennai city riding. I'm not sure if the bike has been run more than 23k and how it has been ridden before, as I am the second owner of the bike
                          Topping up engine oil once in 400~500 Kms shows abnormal consumption...Definitely the rings or the bore itself is worn.A Valve stem seal leak will not need top up at 500 Kms..When the bike is cold, insert your finger into the exhaust pipe opening and check...if it is dry black, then you have rich AFR..If it is wet black, then you have engine problem.
                          When Was The Last Time,You Did Something For The First Time.

                          Comment


                          • #14
                            @reachsamik- As psr sir has mentioned, your rings are leaking oil. valve seal leakage will cause smoke at cold starts and as the engine warms up the smoke will stop. your problem is with bore and piston. open and inspect if there are scratch marks on bore. if there are scratch marks then oil is finding way through the marks to the top. your service center is clearly washing its hands off the matter till warrenty is over. so please stand on their head and get the bore kit replaced under warrenty.
                            @satson- from your description your bore is damaged. as engine oil top-up every 400-500 km indicates heavy oil consumption. so bore kit change is the way else boring.
                            Photo of my joy- http://www.xbhp.com/talkies/854067-post963.html-3.88 lac km cont....Ownership review of my joy- http://www.xbhp.com/talkies/832255-post608.html- slowly updating as and when getting time. HERO HONDA CBZ EXTREME(2011) - 47K KM AND COUNTINGhttp://www.xbhp.com/talkies/motorcyc...tml#post904152-carb tuning guide

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                            • #15
                              Originally posted by reachsamik View Post
                              I noticed today that the smoke is not that huge as previous. The smoke now is somewhat noticet at higher rpms. Thou i have nt tested it by riding it above 80s . I parked my bike on main stand and rev ed it hard . After some hard revs the smoke is coming and its not that whita as i noticed earlier while real riding. I took my bike to the svc cntr and showed the smoke. They said its normal. In that rpms this kind of smoke comes out.
                              Is it true as i did nt noticed it when my bike was new.

                              Sent from my LG-P500 using Tapatalk 2
                              mail bajaj about this and see what happens

                              Comment

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