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1984 Katana 7/11

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    Seals arrived yesterday, so I've got the second shock back on the Kat. Felt good to sit on last night so I'll ride it to work today and see how it goes.

    Next up is to slot a loaner set of stock carbs in so I can do something with the VM33's.
    1982 GS450E - The Wee Beastie
    1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

    sigpic

    450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

    Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

    Comment


      Ooops not gotten back to update this!

      Rebuilt shock seems good, although I've only ridden to work and back once to verify so far. Pretty confident though as the stanchion is in good shape.

      I got the loaner set of stock carbs in but not had time to do anything more than start the Kat and make sure it runs, not even got it warm enough to turn the choke off yet.

      Question on the mixture/air/fuel screws on these Kat carbs... the manual indicates they're mixture screws, but doesn't clarify which way to adjust for richer or leaner mixture. I assume in (clockwise) is less mixture therefore leaner idle, and out is more mixture would be richer idle. Is that right?

      Is there a trick to adjusting number 2 without taking the tank off? I can get to the other three but the vacuum hose makes number 2 rather tricky to get to...
      1982 GS450E - The Wee Beastie
      1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

      sigpic

      450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

      Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

      Comment


        Ok brief update time... got the loaner stock carbs reasonably dialed in at last!

        Test ride the other day had a steady 100kph cruise ~3900 RPM showing 11.5:1 on the AFR gauge, and WOT runs going to just over 12:1 then dropping to sit at high 11's.

        I've dropped the needle a notch and will have to drop the mains back a size yet (122.5's in it now). Rode it to work and back yesterday and will do again today, and the needle is definitely 100% improved although with traffic there's no way to get a good steady needle reading, will have to wait for tomorrow's fun ride for that.

        What I should have added is that the confidence killing lag between throttle closing and opening I had with the VM33's is all gone with the stock CV's, but the one downside is the arm stretching I felt at 1/4 to 1/2 throttle isn't quite the same. At least now I'll get some breathing space to figure out what to do to get them sorted properly.
        Last edited by pete; 08-08-2019, 03:23 PM.
        1982 GS450E - The Wee Beastie
        1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

        sigpic

        450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

        Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

        Comment


          We all need a bit of “arm” stretching once in a awhile. Glad you are getting a bit.
          sigpic
          83 GS1100g
          2006 Triumph Sprint ST 1050

          Ohhhh!........Torque sweet Temptress.........always whispering.... a murmuring Siren

          Comment


            I remember well the "arm-stretching" of my old 81 gs1100e. Ya had to have it pointed in the right direction when ya pulled the trigger on that bike.
            Expecting the Spanish Inquisition
            1981 GS850G: the Ratzuki
            1981 GS1100E

            Comment


              Cheers guys, yes a bit of arm stretching is definitely fun times

              Heading out for the usual Katana Australia Saturday morning ride this morning so should get a good read where it's all at with the dropped needles, then hopefully I can leave it alone and just enjoy the ride while I figure out the VM33's.
              1982 GS450E - The Wee Beastie
              1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

              sigpic

              450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

              Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

              Comment


                Well it looks like the carbs are at a point where I can just leave them alone and enjoy riding while I figure out what to do with the VM33's

                Cruising has the AFR between 12.5 and 13.2 depending on speed/RPM so I'm happy with that, and WOT runs had a fairly consistent 12.5 so I'm going to leave the mains alone now as well.

                I probably should post an obligatory pic too...

                Untitled by starpoint73, on Flickr
                1982 GS450E - The Wee Beastie
                1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

                sigpic

                450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

                Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

                Comment


                  Originally posted by pete View Post
                  Ok brief update time... got the loaner stock carbs reasonably dialed in at last!

                  Test ride the other day had a steady 100kph cruise ~3900 RPM showing 11.5:1 on the AFR gauge, and WOT runs going to just over 12:1 then dropping to sit at high 11's.

                  I've dropped the needle a notch and will have to drop the mains back a size yet (122.5's in it now). Rode it to work and back yesterday and will do again today, and the needle is definitely 100% improved although with traffic there's no way to get a good steady needle reading, will have to wait for tomorrow's fun ride for that.

                  What I should have added is that the confidence killing lag between throttle closing and opening I had with the VM33's is all gone with the stock CV's, but the one downside is the arm stretching I felt at 1/4 to 1/2 throttle isn't quite the same. At least now I'll get some breathing space to figure out what to do to get them sorted properly.
                  What AFR gauge are you using?
                  I nearly went for the Tech Edge on from Oz, but decided to get the 14point7 Spartan (inc gauge and sensor) from Canada. I'm looking forward to finally seeing exactly what's happening inside, after so many years of plug-chops and relying on the seat of my pants.
                  ---- Dave

                  Only a dog knows why a motorcyclist sticks his head out of a car window

                  Comment


                    Hey Dave, I've borrowed my mate's at the moment which is an AEM brand gauge with LSU 4.9 sensor. They go on eBay for around the $AU300 mark. The only downside is the gauge is designed to be panel mounted, so the handlebar mount is a DIY effort and it's not really weatherproof.

                    I've also been eyeing off the Tech Edge one for a few years but recently I also discovered 14point7 and am planning on getting one of the SLC Free ones later this year ready for when I'm tackling the VM33's again.

                    While the DIY keeps the price down, the main thing for me is the cables aren't pre-made, so I can make them the right length to fit neatly on the kat. I'll also be able to easily disconnect the gauge and sensor when not in use but be able to leave the wiring in place.

                    I should add you'll never look back once you get an AFR gauge in to figure those ratios out. Unless you're one of those guys who have the magic touch of understanding every different feeling with the butt dyno and have plug reading down to a fine art, it will make your world so much easier.
                    1982 GS450E - The Wee Beastie
                    1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

                    sigpic

                    450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

                    Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

                    Comment


                      Originally posted by pete View Post

                      I probably should post an obligatory pic too...

                      Pete,
                      "Your Kat" came out amazing. How does that sound? Your Kat...
                      Congrats on a superb build, and thank you so much for sharing the excitement - best read in a long time!
                      Scott
                      1982 GS1000S #1 bought in 84, #2 gone, #3 in hibernation
                      1983 GS1100ES #1 (bought in 03, July 09 BOM, 65k traded in 17), #2 New daily rider, #3 in hibernation
                      1982 GS1100E Red #1 - Original owner, sold in 93, #2 (Red) sold in 20 to Andy B
                      2018 Gold Wing Tour - new out of the crate :) 1st non-Suzuki in 38 years
                      sigpic

                      Comment


                        Thanks Scott, yes I still walk into the garage and see it and realise... yeah I have my own Kat at last

                        It's quite fantastic and I'm most definitely enjoying Kat ownership for sure! My only issue is resisting riding it to work every day... a good problem to have!

                        Glad you enjoyed the read, and again thanks so much for your help, I'm hoping to have the VM33's back on later this year too.

                        One thing I've always been told about having a Kat is be prepared to allow time to have a conversation about it when you stop somewhere, and I figured that was a bit of an exaggeration. However, I've discovered it's true... you really do need to allow time to chat to people when out and about. If you stop anywhere at all (even just to get fuel), you will inevitably have at least a brief chat with someone. It even happens in traffic when stopped at the lights...
                        1982 GS450E - The Wee Beastie
                        1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

                        sigpic

                        450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

                        Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

                        Comment


                          It's finally time to revist the VM33 smoothbores.

                          I really wasn't happy with the low throttle position response with them and everything I've read/heard/been told tells me that VM33's in GSX applications need the 2.0 throttle valves/slides. I have 1.5's and the 2.0's are NLA.

                          GregT very kindly offered to modify the 1.5's for me if I couldn't find any 2.0's, so I took him up on his offer and they arrived back here a couple of weeks ago and his work is awesome! If I didn't know they were modified 1.5's you'd think they were out of the factory!

                          Anyway, I was hoping to get them installed again this weekend but I haven't quite gotten that far yet and only ended up getting them bench sync'd and verified the fuel height was good.

                          To check those I ended up making a stand out of scrap timber which helped immensely.

                          Untitled by starpoint73, on Flickr

                          I couldn't justify the cost of a proper fuel level gauge and couldn't find a bolt to modify with the correct thread, so I used a bit of plastic dowel which I shaved down enough to cut the thread of the float bowl into. I glued a bit of rubber around the outside as a sort of a seal and glued a bit of clear vinyl tubing in as the gauge. Worked like a charm! Almost leak free, and certainly leak free enough to be a reliable gauge.

                          Untitled by starpoint73, on Flickr

                          I've discovered also that the stock carbs with the Mikuni push/pull throttle setup has an extremely long pull to WOT, and I have a spare R1 throttle tube here which I want to try to see if it works with the Mikuni housing to give a shorter throw.

                          Anyway, that's a lot of words for a bit of a non-update but plans are afoot!

                          Starting point for the VM33's:

                          Pilot jet - 17.5
                          Air screw - 3/4 turn out
                          Air jet - 0.6
                          Needle - 3rd (middle) position
                          Main jet - 115
                          1982 GS450E - The Wee Beastie
                          1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

                          sigpic

                          450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

                          Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

                          Comment


                            No pic's yet but I took the stock loaner carbs out last night and started getting the VM33's in.

                            Got a little distracted by the fact the horn mount is broken and my horn was just sitting on the valve cover... oops! I made it out of steel to prevent vibration cracking etc. but I guess I made it a little too light duty. Should be a simple fix with some extra steel and a welder (and grinder)... and a re-paint of course!
                            1982 GS450E - The Wee Beastie
                            1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

                            sigpic

                            450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

                            Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

                            Comment


                              Subscribed to your thread. Kat looks stunning! Keep the updates coming.
                              Bikes:

                              1980 GS1000 restomod
                              2006 GSXR 750

                              Comment


                                Cheers mate! I still grin every time I ride it

                                Apparently I now have an incurable disease... I'd like to get a 750 Kat to replace the 450 as my commuter...
                                1982 GS450E - The Wee Beastie
                                1984 GSX750S Katana 7/11 - Kit Kat - BOTM May 2020

                                sigpic

                                450 Refresh thread: https://www.thegsresources.com/_foru...-GS450-Refresh

                                Katana 7/11 thread: http://www.thegsresources.com/_forum...84-Katana-7-11

                                Comment

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