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DIY: Decarb

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  • #16
    oh man! those pics are making my mouth water. hey can you overall your gearbox while you're at it? and post pics!

    thats a lot of carbon on the piston and the head. have you cleaned the exhaust valve? how many kms has your bike done? is it chewing up oil by any chance?
    \"Faster, Faster, Until The Thrill Of Speed Overcomes The Fear Of Death\"-Dr. Hunter S. Thompson

    \"The Laws Of Physics Want Their Virginity Back\"-Kawasaki Ninja

    Comment

    • #17
      Hey Rohit, nice work. Don't be disappointed about the snapped head bolts, I broke the clutch lever yoke and 'lost' a few washers and nuts while dismantling my RD too! It's in the 'chassis, engine and other parts' stage right now. I have taken off the heads and barrels, but I've left the rest of the engine stay in one piece. Will get it done in a few months by someone who knows better. Don't want to screw up anything.

      By the way, I didn't know there would be so much carbon on a 4 stroke piston. My bike's pistons have somewhat the same amount of carbon too. Ofcourse I'll get them changed on a rebore in a few months (they are standard now), but do post how to decarb properly. Will help a lot of people.

      And can you people explain the blowing water through the exhaust thing a bit more? I mean, how much water and how do you blow it? - MAX.
      Some men have thousands of reasons why they cannot do, what they need is one reason why they can.

      Comment

      • #18
        carbon seems excessive for a lean burn 4st.also scbeat off the deposit with a broken ring or a blunt hackshaw blade.try soaking the parts in a mix of 2t oil and petrol,i've heard it dissolves carbon well.check the ring end gap.
        Max u need to check the compression and ring gap before a re bore.if comp.is fine stick to the originals,if ring gap is bit over get new rings and it'll be fine.u always don't need to re bore.
        \'87 High Torque RD 350B
        in first gear,6000 rpm,whack the throttle.

        Comment

        • #19
          rajnish what REBORE?? pulsar got no oversize pistons etc...
          www.bajajpulsar.org
          http://us.f1.yahoofs.com/msgr/sandee...3ovBABk4jLxCYx
          www.bikenomads.com

          Comment

          • #20
            rebore of the RD.
            \'87 High Torque RD 350B
            in first gear,6000 rpm,whack the throttle.

            Comment

            • #21
              Removed the carbon on squish band with screwdriver+wd40 all night. However my carelessness showed when i accidently dropped the camshaft from a height of 2 feet[xx(][xx(], now will this drop require me to change the camshaft bearing(small) or should I continue with it and see what happens?? Also while checking the free rotation of the bearing it mildly locks up after 10-15 rotations.
              http://img.photobucket.com/albums/v2...983/banner.jpg
              \'84 RD350 2 stroke forever.
              A sound clip of my RD: http://rapidshare.de/files-en/481080/15/Rohit1.wav

              Comment

              • #22
                dust might have entered the bearing,try cleaning it and oiling it.also never use a screw driver etc to scbeat carbon.u have to see the play if any of the bearing.
                \'87 High Torque RD 350B
                in first gear,6000 rpm,whack the throttle.

                Comment

                • #23
                  screwdriver? rohit that sounds quite dangerous..last thing u want are scratch marks...try mixing oil+disel and then use a brush..
                  www.bajajpulsar.org
                  http://us.f1.yahoofs.com/msgr/sandee...3ovBABk4jLxCYx
                  www.bikenomads.com

                  Comment

                  • #24
                    hmm kerosene should prove a good cleaning agent ...
                    \"Faster, Faster, Until The Thrill Of Speed Overcomes The Fear Of Death\"-Dr. Hunter S. Thompson

                    \"The Laws Of Physics Want Their Virginity Back\"-Kawasaki Ninja

                    Comment

                    • #25
                      How do I polish the combustion chamber? Do i need a special tool? Still am unable to lift barrel.
                      http://img.photobucket.com/albums/v2...983/banner.jpg
                      \'84 RD350 2 stroke forever.
                      A sound clip of my RD: http://rapidshare.de/files-en/481080/15/Rohit1.wav

                      Comment

                      • #26
                        have u tried tapping the dowels lightly and then trying to lift the barrel up..
                        www.bajajpulsar.org
                        http://us.f1.yahoofs.com/msgr/sandee...3ovBABk4jLxCYx
                        www.bikenomads.com

                        Comment

                        • #27
                          You mean tapping the dowel pins?
                          http://img.photobucket.com/albums/v2...983/banner.jpg
                          \'84 RD350 2 stroke forever.
                          A sound clip of my RD: http://rapidshare.de/files-en/481080/15/Rohit1.wav

                          Comment

                          • #28
                            yes..there are two of em...lightly tap with ur hand in upward direction..
                            www.bajajpulsar.org
                            http://us.f1.yahoofs.com/msgr/sandee...3ovBABk4jLxCYx
                            www.bikenomads.com

                            Comment

                            • #29
                              quote:Originally posted by rajnish

                              Max u need to check the compression and ring gap before a re bore.if comp.is fine stick to the originals,if ring gap is bit over get new rings and it'll be fine.u always don't need to re bore.
                              Rajnish, I assumed that a rebore is necessary cos :
                              -There is lots of play between piston and cylinder, so much that the piston can be shaken inside the cylinder.
                              -Checking a lot of things, I have come to the conclusion that the bike has been running in this original state for the past 20 years of its existence and from the black colour, the pistons look more like they've been put in fire (lack of maintenance I guess).
                              -In any case, I am not dismantling the engine. Once I finish restoring all the other parts on the bike, I will take the engine to Ron and let him do whatever is necessary.
                              -I showed the barrels to a couple of mechs and they swear that it's not sleeved. I am wondering what's wrong! I got a bike on standard barrels and pistons?! Sounds a bit too weird! Will have to take pics and show Ron to know if its a sleeve or not.
                              Some men have thousands of reasons why they cannot do, what they need is one reason why they can.

                              Comment

                              • #30
                                quote:Originally posted by madmax

                                quote:Originally posted by rajnish

                                Max u need to check the compression and ring gap before a re bore.if comp.is fine stick to the originals,if ring gap is bit over get new rings and it'll be fine.u always don't need to re bore.
                                Rajnish, I assumed that a rebore is necessary cos :
                                -There is lots of play between piston and cylinder, so much that the piston can be shaken inside the cylinder.
                                thats called piston slap.
                                \"Faster, Faster, Until The Thrill Of Speed Overcomes The Fear Of Death\"-Dr. Hunter S. Thompson

                                \"The Laws Of Physics Want Their Virginity Back\"-Kawasaki Ninja

                                Comment

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