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RX rebuild Using 3 Yamaha Variants

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  • Originally posted by aargee View Post
    Yeah, I did experiment with 15/34 once & the pick up went damn bad. I mean, the top speed on every gear with 15/34 combo will take lot of time to match with 16/34. However, I haven't had the chance to test on 5th. The pick up was so sluggish too.
    I thought I was the only one poor in mathematics and calculating ratios.....Thanks for giving me company.
    When Was The Last Time,You Did Something For The First Time.

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    • Originally posted by SunnyBoi View Post
      4 Speeds cannot go beyond 100-105KMPH true speed.
      Ok

      Originally posted by SunnyBoi View Post
      Are you sure? Apply the sprocket logic and think again on what you have typed.
      Ok, when the carbs are in perfect shape, will do the work out again. It only a matter for 15-20 mts changing. I mean, 15-34 right?

      Originally posted by SunnyBoi View Post
      and expect it to run 20,000KMs before needing a rebore.
      ^^^ is exactly what I meant!!! See mine is stock barrel bought in 2009 Aug/Sep & has clocked about 22000 (13.5K + 8.5K) & about a month ago it still showed about 128psi in compression meter. This is why I said, LONGER engine life. But again, each his own.

      Originally posted by psr View Post
      I thought I was the only one poor in mathematics and calculating ratios.....Thanks for giving me company.
      From my thorough understanding, the front sprocks has to be as big as possible & the rear sprocks has to be as small as possible. But with this combo, the pick up is bound to affect on a huge scale (not 15/34 I mean, but generally). Anyway, I'll complete the carbs & then try out, I still have 15/16 sprocks & 39/34/38 sprock sets with me
      Skill is what keeps you on a Motorcycle
      Awareness + Skill is what keeps you out of harm's way
      ATGATT + Awareness + Skill means you might Live To Ride another day

      Comment


      • Originally posted by aargee View Post
        Meanwhile, my experiments with carbs are another write up. I'll pen them down here some day.
        The experience on TM28 & my learnings on them are worth while for another thread because it dates back to even the pre-rebuild era . I'm keeping it here so that all my experiences are collected under a single thread.

        Somewhere during Aug/Sep 2009 when I'd changed the existing (cheated) cylinder to a stock one from YMIS. I was happy for the new one but at the same time, had to do a run in for 1000 Kms. Trust me, I feel stupid on this one because, I now know how easy the work is & at that point in time, I'd got the job done through a mechanic. Thank God, that guy didn't steal the cylinder

        So during the run in period, I observed the vehicle to be too tight & being in run-in I never paid much attention on the smoothness. All my aim was to complete the 1000 Kms run-in ASAP.

        After the deadline of 1000 Kms was over, I got it serviced from the same mech. He said, the vehicle is kept slightly rich & I still remember the words he said, "Rich na, actualla rich illa, aana richa irukku". Damn!!! confusing statement & this happened sometimes during Nov 2009 on a Sunday afternoon. Next day when I ride to office, I noticed something really strange which I never knew will haunt me for several months...
        Skill is what keeps you on a Motorcycle
        Awareness + Skill is what keeps you out of harm's way
        ATGATT + Awareness + Skill means you might Live To Ride another day

        Comment


        • Yeah, I did experiment with 15/34 once & the pick up went damn bad. I mean, the top speed on every gear with 15/34 combo will take lot of time to match with 16/34. However, I haven't had the chance to test on 5th. The pick up was so sluggish too.

          Sprocketting as on RX100 15front 39rear
          final drive ratio for rx 100= 39/15=2.6

          Hence if front sprocket size is increased to 16 Ratio will be 39/16 =2.437 If Rear sprocket size is decreased to 37T Ra tio will be 37/15=2.46

          If rear sprocket size is increased will result in increased pick up but lower top end.
          If rear sprocket size is decreased will result in sluggish acceleration and increased top end.
          If front sprocket size is increased will result in sluggish acceleration and increased top end.
          If front sprocket size is decreased result in increased pick up but lower top end.

          Comment


          • @all here is a link for sprocket ratio
            Motorcycle Sprocket Ratio Calculator

            Comment


            • Thanks yb100! and welcome to the forum!
              1985 Yamaha RD350 HT
              1989 Ki-Honda 110
              1994 Suzuki Shogun
              1997 Yamaha RX135
              2008 Yamaha FZ
              Suzuki Supra Powerup
              IND-SUZUKI AX100
              Hero IMPULSE
              TVS NTORQ


              No Cams, No Valves, No Headaches.

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              • @Boi :

                What about that 135 bore which I seized and then you seized ..twice ? ..but still runs like effin crazy on the pipe ...how much mileage was it giving ? 33? It hasn't been rebored has it ? At least not by you right ?
                Sandeep K Ram blogs at

                http://sandeepkram.blogspot.com

                Comment


                • Originally posted by Sandeep_K_Ram View Post
                  @Boi :

                  What about that 135 bore which I seized and then you seized ..twice ? ..but still runs like effin crazy on the pipe ...how much mileage was it giving ? 33? It hasn't been rebored has it ? At least not by you right ?
                  Ummm yeah thats the one i've been using since 2 years or so and came off when you were tehre. Hasnt been reored, just a change of rings in november.

                  Used to get 27 after rings change while riding full tilt everyday on BETL. Seizures happened because i ran into reserve while doing 70mph on both ocasions. Both were partial seizures, light marks on the piston which wont matter anyways.
                  Yamaha RX165 5-Speed
                  Yamaha RD350
                  HH Karizma
                  Honda NSR150SP

                  Comment


                  • After the several OT's let me narrate the story on carbs

                    Originally posted by aargee View Post
                    Next day when I ride to office, I noticed something really strange which I never knew will haunt me for several months...
                    I was able to start up without a choke. Good. So I thought everything is fine; then there's flutter, which I couldn't recognize at that point. Gear 1, 2, 3, 4 & 5 & now when I close the throttle, man it pushes the entire ride & me front & back Lol For the first time I felt as if I were on a rocking bed & not riding

                    This happened on a Monday & the entire week now I experiement & then learn that the vehicle jerks when the throttle is closed. On Friday, I go mad over this issue & start ripping thinking if there're some block in the carbs or jets then it would be choked away. What a dumb ass !!!

                    It only gets worse & the smoothness is lost. I now curse myself to have given to the mechanic for service. But remember these experiences are sometimes before July 2010 which means, before rebuilding the Rx. So I console myself saying since this is an old vehicle that is missing rubber on the cylinder & heads such things are prone to happen!!! Damn me
                    Skill is what keeps you on a Motorcycle
                    Awareness + Skill is what keeps you out of harm's way
                    ATGATT + Awareness + Skill means you might Live To Ride another day

                    Comment


                    • I too had flutter problem on my RX. Figured out it was due to dusty UNI air filter (Thanks to dusty roads) Soaked it in soap solution for 2-3 hours and then gently cleaned it all, oiled. Now bike runs perfect without any hitch!
                      Maybe its the same thing with you. Also lean the air-fuel mixture just a bit.
                      Bikes don't leak oil, They mark their territory.

                      Comment


                      • Oh!!! Thanks DjVenom. I've passed all these phases; those are my experiences during Aug/Sep/Oct 2010; I'm just sharing those incidents here for record so as to help others
                        Skill is what keeps you on a Motorcycle
                        Awareness + Skill is what keeps you out of harm's way
                        ATGATT + Awareness + Skill means you might Live To Ride another day

                        Comment


                        • Thought you are still facing some difficulties
                          Bikes don't leak oil, They mark their territory.

                          Comment


                          • HELP

                            Guys, I'm really sick of myself when it comes to calculating FE. This is the (worst) way I'm calculating the FE due to circumstances. I know this method isn't right, but still, the FE should be somewhere closer, but the fact is that, I'm making a blunder somewhere.

                            I hit reserve at 8974
                            I fill precise to 2 Ltrs at 9002
                            Current ODO reading is 9028 & still the vehicle is not in reserve

                            So I opened up mains & measured the left over which is 850 ml before hitting reserve knob

                            This is how I'm calculating the FE
                            (9028 - 8974)
                            -----------------
                            (2000 ml - 850 ml)

                            Equals

                            54
                            --
                            1.150 Lts

                            Equals = 46.7 No way I'm going to believe this & neither are you guys

                            Pls help guys!!!
                            Skill is what keeps you on a Motorcycle
                            Awareness + Skill is what keeps you out of harm's way
                            ATGATT + Awareness + Skill means you might Live To Ride another day

                            Comment


                            • :O

                              i am not believing it .....

                              Best way to calculate FE is tank-full to reserve ....
                              Down the GEAR and DISAPPEAR

                              Yamaha RD 350 (1984)

                              Yamaha RX 100 (1995)

                              Yamaha YZF R15 V2.0 (2012)

                              Comment


                              • Originally posted by aargee View Post
                                HELP

                                Guys, I'm really sick of myself when it comes to calculating FE. This is the (worst) way I'm calculating the FE due to circumstances. I know this method isn't right, but still, the FE should be somewhere closer, but the fact is that, I'm making a blunder somewhere.

                                I hit reserve at 8974
                                I fill precise to 2 Ltrs at 9002
                                Current ODO reading is 9028 & still the vehicle is not in reserve

                                So I opened up mains & measured the left over which is 850 ml before hitting reserve knob

                                This is how I'm calculating the FE
                                (9028 - 8974)
                                -----------------
                                (2000 ml - 850 ml)

                                Equals

                                54
                                --
                                1.150 Lts

                                Equals = 46.7 No way I'm going to believe this & neither are you guys

                                Pls help guys!!!
                                As I told you earlier, have some patience. When you hit reserve, just note the reading and fill it with exact quantity of petrol (say...2 litres petrol). I would not try to measure the quantity by opening up the main and checking. Wait until it hits reserve again. Note the reading and now calculate the difference. This way you would not want to run till the last drop and landing in middle of nowhere.

                                Having said above, you should least arrive at FE after few above exercise to know if not exact but the range (say 35-40 kmpl...whatever!)

                                Originally posted by prakhararya View Post
                                i am not believing it .....

                                Best way to calculate FE is tank-full to reserve ....
                                I don't go round about and wait a long time to calculate. See my comments above. Logical, tried and tested.
                                RX100 1996 | Karizma 2004 | Karizma-R 2011 | RXZ 1999 | RX 135 1998 | RX 100 1993 | CBF150 2005 - 2011

                                2012 - Meghamalai | Kuttralam | 2011 Ooty | Munnar | 2010 Point Calimere | Horsley Hills | Yercaud

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