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COSMETIC REBUILD: Yamaha RX100 1986 (now engine rebuilt)

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  • #61
    Many thanks to Pradeep (pyscho) for obliging with the test. The reading was 135. I would say not bad considering the bore clearances have increased. Not considering replacing the bore anytime soon.
    AFAIK, 135psi above sea level is a good reading. Most RX100's I have checked ran 112-115 psi.

    what do u suggest the compression reading for a RX135 5speed model should be???
    anything upwards of 120psi

    cheers

    Atul H
    83' RD350 HT
    96' RXG
    97' RXZ
    91'RX100>09'RX165
    2010' HH ZMR

    Comment

    • #62
      Originally posted by jd666 View Post
      on the name of compression testing. what do u suggest the compression reading for a RX135 5speed model should be???
      Here is Dilip Bam's take on compression. Lends somewhat of a scientific/mathematical basis. But I think experts here would disagree.
      INDIABIKE.COM - Q & A Search Results

      P.S: I had asked this question right after decarb and the reading then was 120.
      A lone amateur built the ark. A large group of professionals built the Titanic...

      Comment

      • #63
        Thanks atul!! thanks nitin!!


        My offerings to the gods of speed -

        - KTM Duke 200
        - Yamaha RXZ 5 speed


        Comment

        • #64
          Originally posted by jd666 View Post
          on the name of compression testing. what do u suggest the compression reading for a RX135 5speed model should be???
          Mine is hitting 160+psi, and ideal stock set up should be at 130-140psi.
          Last edited by psycho 98; 01-18-2010, 04:07 PM.
          "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

          Comment

          • #65
            compression is also engine specific. A high revving motor would usually be a low comp wheras a motor with a lower redline would always have a higher compression. This is because of exhaust port area and several other factors. Although this isnt a rule written in stone.

            A good example here would be the RD350 HT and LT. A good healthy HT would have about 130psi at sea level, whereas a similarly setup LT with same pistons and clearances would throw about 140-155psi with just HT heads [lower squish gap from 2-4mm to 0.8mm]

            Cheers

            Atul
            83' RD350 HT
            96' RXG
            97' RXZ
            91'RX100>09'RX165
            2010' HH ZMR

            Comment

            • #66
              Hi,
              congrats for ur bike it lokks really cool.i have a1992 rx 100 u can check its pics
              Prashant Singh
              Family:
              Yamaha Rx100
              Royal Enfield 350

              Comment

              • #67
                It has been 3000kms since the rebuild and first problem comes in this form. I've given the tank to DTW for re-paint. He has agreed to do it FOC after ascertaining the cause.

                Initial guess is petrol spillage. Plausible. I fill about 8-9litres of fuel after it comes to reserve. But it shouldn't matter if paint & workmanship is perfect. Lets see.
                A lone amateur built the ark. A large group of professionals built the Titanic...

                Comment

                • #68
                  nitin aaana.... hosa tank pics yelli ?

                  Comment

                  • #69
                    anna

                    inna sunna balita idaare

                    Translation: It is still being painted

                    He had asked for seven days time, so...This Saturday I will call again.
                    A lone amateur built the ark. A large group of professionals built the Titanic...

                    Comment

                    • #70
                      Got my tank today.
                      No charges.
                      It looks like this.

                      Planning to replace:-

                      Carb (only if I get Mikuni VM20)
                      Exhaust pipe

                      Will keep you guys updated
                      A lone amateur built the ark. A large group of professionals built the Titanic...

                      Comment

                      • #71
                        Originally posted by NitinGirish View Post
                        Got my tank today.


                        Planning to replace:-

                        Carb (only if I get Mikuni VM20)


                        Tough to find an OEM one bro allthough Pradeep might still be able to help you on this one.

                        I dunno how the experts rate the pacco brand carbs but i got me one and it seems to be running real fine. You can always try that too
                        http://www.youtube.com/watch?v=yjWXI8T2HUM
                        ---------------------------
                        07' Pulsar 200 DTS-i
                        99' Suzuki Shaolin
                        85' Royal Enfield Bullet 350 (Sold)
                        86' Ind-Suzuki Ax 100 (Sold)
                        03' HH Splendor

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                        • #72
                          Yeah, efforts are on to source it Not putting anything other than Mikuni. My father couriered few carb parts (Jets, airscrew, etc.) Will replace once I get them, while I hunt for new carb
                          A lone amateur built the ark. A large group of professionals built the Titanic...

                          Comment

                          • #73
                            Originally posted by NitinGirish View Post
                            Got my tank today.
                            No charges.
                            It looks like this.

                            Planning to replace:-

                            Carb (only if I get Mikuni VM20)
                            Exhaust pipe

                            Will keep you guys updated
                            tank looks neat... VM20 i guess can be got ? all RX100 run on VM20 ? correct me if i am wrong .RX100 Clutch bell seems to be difficult to get Bores seems to be easier to get

                            Comment

                            • #74
                              Yup, VM20 for 100. VM22 for RXG, mentioned in workshop manual. But some of us import VM24/26 flatslides from U.S.A
                              VM20 should be pretty easily available im Malaysia/Singapore. If all was well I should have been there by now..sigh!

                              Currently requesting one of our friendly tuner on the forum

                              Clutch bell is not such an indispensiable spare part I 'feel'. If the plates, gears, magneto are properly fitted (which would be coming from factory) I guess there should be no problem But yeah, for future use better to stock up.
                              Last edited by NitinGirish; 03-04-2010, 07:52 PM.
                              A lone amateur built the ark. A large group of professionals built the Titanic...

                              Comment

                              • #75
                                Makes me feel why I sold off my '86 RX 100 for only Rs 5.5k
                                02 Qualis GS
                                03 Zen Carbon
                                62 Jawa 353 "Tank Switch"
                                83 RD350 HT
                                87 Yezdi 350 Twin
                                99 Yamaha YBX
                                03 RXZ 5-speed
                                08 Suzuki Access
                                None Sold!!! All in the Stable

                                Comment

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