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Yamaha YZF750R experience

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    Yamaha YZF750R experience

    Anyone here have experience with Yamaha 750's, 1994 YZF750R EXUP model in particular?

    My son has been saving some pennies and has found one for sale he's interested in and I have no idea what to look for good or bad. I joined a Yamaha forum and asked the question there, so far nothing.

    Any advice would be appreciated, thanks.
    It's smoke that make electronic components work.
    Every time I've let the smoke out by mistake, they never work again.
    '80 GS250T... long gone... And back!
    '86 Honda Bol D'Or... very sadly long gone
    '82 GS1000SZ
    '82 GS1100GL
    '01 Honda CBR1100XX BlackBird

    #2
    Beware of the exhaust valves.
    They were prone to burn.
    El G

    Comment


      #3
      That is Yamaha's Genital cylinder head with FIVE VALVES per cylinder on that bike!!!

      Just costs more money to have valves adjusted and more money for a valve job when needed!

      Another great idea that looked good on paper, but fizzled out in the real world.

      Comment


        #4
        Originally posted by Wester Cooley View Post
        That is Yamaha's Genital cylinder head with FIVE VALVES per cylinder on that bike!!!

        Just costs more money to have valves adjusted and more money for a valve job when needed!

        Another great idea that looked good on paper, but fizzled out in the real world.
        Didn't fizzle out on the R1 - certainly a good idea if you've ever ridden one
        Current:
        Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha )

        Past:
        VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
        And a bunch of other crap Yamahas....

        Comment


          #5
          Originally posted by hillsy View Post
          Didn't fizzle out on the R1 - certainly a good idea if you've ever ridden one
          Agreed. ....
          1984 GS1100GK newest addition to the heard
          80 GS 1000gt- most favorite ride love this bike
          1978 GS1000E- Known as "RoadKill" , Finished
          83 gs750ed- first new purchase
          85 EX500- vintage track weapon
          1958Ducati 98 Tourismo
          “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
          If it isn't going to make it faster or safer it isn't worth doing

          Comment


            #6
            I stand corrected. Please forgive me Almighty Gods of Yamaha!!!

            Never worked on a R1. Just FZR1000's.

            And its shim under bucket. What a nightmare to do valve adjustments on. Its like working on a watch.

            Plus not ONE Yamaha dealer ever has shims when you need them.

            If you just ride them, and not work on them, they are great, I guess.
            Last edited by Guest; 05-12-2014, 01:19 PM. Reason: added something!!

            Comment


              #7
              Well that seems like enough to put me off!

              Thanks for the input fellas...
              It's smoke that make electronic components work.
              Every time I've let the smoke out by mistake, they never work again.
              '80 GS250T... long gone... And back!
              '86 Honda Bol D'Or... very sadly long gone
              '82 GS1000SZ
              '82 GS1100GL
              '01 Honda CBR1100XX BlackBird

              Comment


                #8
                Shim under bucket has been the norm for over 20 years. Service intervals are much wider than tappets, so you don't need to do then so often.

                That's the price you have to pay for performance.

                Back to the YZF750 - my brother in law has one and I've worked on it a bit. Fiddly to get the carbs on and off - general maintenance is kinda painful. They were built early on in the grand scheme of "new age superbikes" but were still a nice bike to ride. And fast. That 5 valve motor is sweet - regardless of maintenance / re-build costs.
                Current:
                Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha )

                Past:
                VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
                And a bunch of other crap Yamahas....

                Comment


                  #9
                  Originally posted by Wallowgreen View Post
                  Well that seems like enough to put me off!

                  Thanks for the input fellas...
                  I had an FZ in the past and the valves aren't bad compared to most modern shim under bucket valves. At least on the FZ the valve cover is accessible by just removing the tank. 4 valves or 5 valves doesn't make a lot of difference if you have to pull the cams. At least on the Yamaha the recommended interval is 25,000 miles (42,000kms) between adjustments. Due to the light, small valves there seems to be almost no wear. On mine I adjusted them at 40,000 kms (I think it needed 2 shims) and at 100,000 kms they still didn't need any shims changed. Having been there I just don't understand what's so bad about it. After break in only one valve adjustment and 2 shims in 100,000 kms. can't be all bad. The FZs are certainly bullet proof.
                  Last edited by Sandy; 05-13-2014, 09:32 AM.
                  '84 GS750EF (Oct 2015 BOM) '79 GS1000N (June 2007 BOM) My Flickr site http://www.flickr.com/photos/soates50/

                  Comment


                    #10
                    Here is my YZF750/1000.
                    Fun bike


                    El G

                    Last edited by Guest; 05-14-2014, 11:19 AM.

                    Comment


                      #11
                      That looks sweet Gordon, you still have it?

                      How would you sum up ownership - they troublesome to maintain and wish you never had it or easy to keep running nice? From what I've read on the web and in magazines, I've found no mention of them being a valve shredder or any other class problems actually.

                      I suspect maintenance is where my involvement is going to be!!
                      It's smoke that make electronic components work.
                      Every time I've let the smoke out by mistake, they never work again.
                      '80 GS250T... long gone... And back!
                      '86 Honda Bol D'Or... very sadly long gone
                      '82 GS1000SZ
                      '82 GS1100GL
                      '01 Honda CBR1100XX BlackBird

                      Comment


                        #12
                        I can't speak for Gordon for the YZF750R but I can for it's early cousin '85 FZ750. I owned it from 40,000 kms to 100,000 kms and was totally neglected when I got then I totally abused it with some track days, street racing and touring for another 60,000 kms. When I got it, it had hit a deer at some point and the fairing was broken as well the chain, which was original broke and damaged the clutch pushrod seal recess and was puking oil all over the place. Anyway after getting everything repaired and the servicing current I put another virtually troublefree 60,000kms on it. The only repairs and service that was done other than the usual fluid changes was another set of chain and sprockets at around 70,000, no shims needed after the 40,000 valve adjustment, clutch slipped a bit at around 80,000 kms (only at full throttle at max power band in top gear) so I just stuck new clutch disks in ($80.00), a failed ignition module at some point (swapped with a used one off an FZ600), and the stock exhaust rusted through at some point and I installed a pair of Supertrapp aluminum slip-ons. Bike ran as good the day I sold it as the day I put it back on the road. The FZR750 is pretty much the same motor in a much nicer chassis.
                        '84 GS750EF (Oct 2015 BOM) '79 GS1000N (June 2007 BOM) My Flickr site http://www.flickr.com/photos/soates50/

                        Comment


                          #13
                          Originally posted by Wallowgreen View Post
                          That looks sweet Gordon, you still have it?

                          How would you sum up ownership - they troublesome to maintain and wish you never had it or easy to keep running nice? From what I've read on the web and in magazines, I've found no mention of them being a valve shredder or any other class problems actually.

                          I suspect maintenance is where my involvement is going to be!!
                          That is from the "gone but not forgotten" list.
                          The 750 engine was replaced with a ThunderAce 1000 engine.
                          It had a bit of exhaust valve issues.
                          I am lazy.
                          That is why I have Suzukis.
                          Far less maintenance.
                          G

                          Comment


                            #14
                            I can't tell you yet on how good or bad the bike is, I just finished up the rebuild on this one, for now it runs well, I did not do the valves, but I will tear her down come winter and see what the valves are it, I will take the gamble.....

                            everything else on the bike was in OK condition, and compared from what I started with to what she looks like now, I am happy....

                            before



                            after

                            Comment


                              #15
                              Thanks again fellas.

                              Been watching and reading your rebuild GK. Very nice job mate!

                              I thought they were strong machines, sounds like it might suit after all. Wonder if it's still for sale....
                              It's smoke that make electronic components work.
                              Every time I've let the smoke out by mistake, they never work again.
                              '80 GS250T... long gone... And back!
                              '86 Honda Bol D'Or... very sadly long gone
                              '82 GS1000SZ
                              '82 GS1100GL
                              '01 Honda CBR1100XX BlackBird

                              Comment

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