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    jets

    if you're replacing 3 jets anyway, i'd replace the 4th as well. that way you minimise the chance of a headache when it comes to the tuning (as you'll know the jets are NOT a part of a (possible) problem
    GS850GT

    Comment


      valve clearance

      you are supossed to measure the gap between the cam and the shim. the cam has to be in a particular position relative to the shim/bucket, i'll post the instruction for you
      what's the thickest feeler gauge that you can slide?
      GS850GT

      Comment


        valve adjustment

        Valve adjustment
        When checking exhaust valves, the outer cylinder's (#1 or #4) cam lobe is pointing forward, the inner lobes (#2 or #3) will be pointing UP. Do not move the crank, you can check both of them. Then rotate the crank 180 degrees so the outer cylinder on the other side of the engine is pointing forward and the inner one is pointing up. Again, you can check both valves without moving the crank.

        On the intake side, the outer cylinder's lobe will be pointing UP, the inner one will be pointing BACK. Check both valves on that side, then rotate the crank 180 degrees and check the other side.

        The theory here is that both valves are untensioned which makes the clearance more consistant than if #1 was depressing the valve while trying to measure #2.

        GS850GT

        Comment


          more info, just in case

          cylinders are "counted" 1 - 4 starting from the left when you sit on the bike
          exhaust valves are the ones in front of the engine. intake valves are at the back.
          GS850GT

          Comment


            psyguy,
            thank you for the run-down and help on the valve adjustment. I never understand why the positioning, thanks for pointing out that it is to get a better measurement. Some of my gauges go 3/4 of the way between the shaft and the tappet, some go 1/2 and some go 1/4 way. All feeler gauges fit between, but none fit all the way between. Do you get what I mean?

            Comment


              I think I figured it out. I am using feeler gauges in inches, not mm. I will have to go to the store tomorrow and pick up some mm feeler gauges. The feelers are supposed to go all the way between right?

              Comment


                Originally posted by KRISTI'SGS550 View Post
                Today I also pulled my cam chain tensioner and cleaned it and reset it. I don't think it was properly installed by the PO because it wasn't moving at all. I think he has the screw and bolts tightened all the way therefore not letting the setup move at all. So I pulled it, cleaned a lot of crud off of it and reinstalled it properly so it will hopefully work when I start the bike.
                good call on the tensioner!
                i suspect it is easy to get it wrong unless time is taken to study how the tensioner actually works
                i had to go back and forth between the tensioner in my hands and the service manual a few times before i could get my head around it
                GS850GT

                Comment


                  yeah I had to look at a walk through a couple times while putting the tensioner back together, to make sure i did it correctly.

                  Comment


                    Originally posted by KRISTI'SGS550 View Post
                    psyguy,
                    thank you for the run-down and help on the valve adjustment. I never understand why the positioning, thanks for pointing out that it is to get a better measurement. Some of my gauges go 3/4 of the way between the shaft and the tappet, some go 1/2 and some go 1/4 way. All feeler gauges fit between, but none fit all the way between. Do you get what I mean?
                    need to go THINNER then
                    the gauge has to go all the way through under the shaft
                    GS850GT

                    Comment


                      Originally posted by KRISTI'SGS550 View Post
                      I think I figured it out. I am using feeler gauges in inches, not mm. I will have to go to the store tomorrow and pick up some mm feeler gauges. The feelers are supposed to go all the way between right?
                      you CAN use the gauges in inches if you have the right sizes
                      do you have access to the data on the gaps in inches?
                      GS850GT

                      Comment


                        Originally posted by psyguy View Post
                        you CAN use the gauges in inches if you have the right sizes
                        do you have access to the data on the gaps in inches?

                        I looked at the gauges closer after we started talking and it has the inches and mm. The smallest mm is .038 and it doesn't fit underneath. The gauge then goes to .051mm, followed by .076 and 1.02mm. None of which, especially the 1.02 fit underneath the shaft and over the shims. The small ones fit about 3/4 of the way, but they can't poke out the other side, either too big or I still have the shaft facing the wrong way or something? Shouldn't some of these fit? Like the .038, .051 at least?

                        Comment


                          Originally posted by KRISTI'SGS550 View Post
                          Shouldn't some of these fit? Like the .038, .051 at least?
                          it would be VERY nice if they did but reading the forums here it seems that that's often not the case - unless the PO was a member here and knew the importance of the proper valve adjustment!

                          if .038 gauge doesn't fit you'll need to go down (at least 1) size on shims
                          you can take them all out taking care to write down their position, they should be stamped with a number, you may be able to re-use some and see how your gauge fits

                          talk to "steve" he's got excell template easy to work out the shim sizes you require
                          there's a lso a shim swap thread going on, you might want to check that
                          GS850GT

                          Comment


                            Originally posted by psyguy View Post
                            it would be VERY nice if they did but reading the forums here it seems that that's often not the case - unless the PO was a member here and knew the importance of the proper valve adjustment!

                            if .038 gauge doesn't fit you'll need to go down (at least 1) size on shims
                            you can take them all out taking care to write down their position, they should be stamped with a number, you may be able to re-use some and see how your gauge fits

                            talk to "steve" he's got excell template easy to work out the shim sizes you require
                            there's a lso a shim swap thread going on, you might want to check that
                            Yeah I emailed steve for his awesome excell template. I didn't see him on tonight though so maybe he will send it to me tomorrow? After I get my little guys measured and figure out what I need and what I have left over I will post my findings on the shim swap thread. I have been reading through it a few times looking for answers to my questions.
                            Last edited by Guest; 02-28-2008, 05:20 AM. Reason: spelling error

                            Comment


                              if .038 gauge doesn't fit you'll need to go down (at least 1) size on shims
                              you can take them all out taking care to write down their position, they should be stamped with a number, you may be able to re-use some and see how your gauge fits [quote]

                              When PSYGUY says "you can take them all out", he doesn't mean at once as you will damage the camshaft lobes and buckets as you rotate the motor. Measure each clearance and then take it out without moving the motor, measure the shim, record its size and which valve it belongs to. Replace that shim and then do the next one.

                              Comment


                                So if the .38mm doesn't fit all the way under and through the other side than I need to foresure go down one shim size? Do I have that correct? And that should make at least that one work and I will be off to the next one right?

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