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    #1

    GS750E Overheat?

    I just got my 82 GS750E back from the shop a few days ago, they performed a valve job, clutch adjustment and carb sync.
    It's been sitting in the garage since then, but today I took it out for a short trip and rode it at around 75mph for a total of 7 miles.
    I've always watched the temp gauge since the bike has been back on the road and it never got past 215 degrees. Around mile 7 I noticed both turn signal indicator lights on at the same time, no blinking, just solid on. I looked at the temp gauge and the needle was at the 320 degrees level. I slowed down and continued to ride it home a couple of miles. The temp lowered and the turn signal indicators turned off.

    Any idea of what happened?
    Could the temp actually have got the high?



    Rick
    1982 Suzuki GS750E
    1979 Suzuki GS750E
    1978 Kawasaki KZ650 C2
    1977 HD CR1000
    1977 Kawasaki KZ400
    1974 Honda CB750
    Tags: None
    #2
    If you have an electrcial problem it could have affected your indicated sensor reading. Have you gone through your charging system? Quick test ring a bell? I wouldn't assume you actually ran that hot unless you can confirm the electrical is in good shape. Given the blinkers I would suggest that is not the case.

    Comment

      #3
      What was the outside temp?
      1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

      2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

      Comment

        #4
        Only 72 outside.
        There was no change in how the engine ran, I don't think I would have noticed anything if I hadn't a temp gauge.
        The temp gauge has always been slow to rise, I had just assumed the engine took a while to warm up, this seemed sudden.
        Last edited by 82Suzie; 04-16-2016, 10:03 PM.
        1982 Suzuki GS750E
        1979 Suzuki GS750E
        1978 Kawasaki KZ650 C2
        1977 HD CR1000
        1977 Kawasaki KZ400
        1974 Honda CB750

        Comment

          #5
          Originally posted by 82Suzie View Post
          ...The temp gauge has always been slow to rise, I had just assumed the engine took a while to warm up, this seemed sudden.
          My oil temp gauge has always been slow to rise, even before I installed a cooler. I have to ride it quite a few miles before the needle moves at all.
          1982 GS1100E V&H "SS" exhaust, APE pods, 1150 oil cooler, 140 speedo, 99.3 rear wheel HP, black engine, '83 red

          2016 XL883L sigpic Two-tone blue and white. Almost 42 hp! Status: destroyed, now owned by the insurance company. The hole in my memory starts an hour before the accident and ends 24 hours after.

          Comment

            #6
            If I recall from your build thread, didn't you have some bad wiring/connectors?
            sigpic
            When consulting the magic 8 ball for advice, one must first ask it "will your answers be accurate?"

            Glen
            -85 1150 es - Plus size supermodel.
            -Rusty old scooter.
            Other things I like to photograph.....instagram.com/gs_junkie
            https://www.instagram.com/glen_brenner/
            https://www.flickr.com/photos/152267...7713345317771/

            Comment

              #7
              After having been out of town for a couple of weeks I got back into this project. I checked the wiring harness and didn't find any issues. I pulled the chrome cover over the oil temp sensor and added insulation. Yesterday I took the Suzie out for a 100 mile ride. The weather temp was perfect at 79-84 degrees, blue skies and a small breeze. I rode four about 20 miles or so, first thru the city and 40 mph and then on to the freeway 65-75 mph. The oil temp gauge showed a slow increase in temperature but at some point it hit 320 again. I decided to keep riding as I didn't notice a difference in how the engine operated. After 60 miles I stopped for gas and after starting the engine, the temp gauge registered somewhere around 260. So I began to distrust it. I took the freeway back at a steady 70mph, the gauge displayed 320 the entire way back.

              Could the sensor need to be replaced or is that normal operating temperature?


              Rick
              1982 Suzuki GS750E
              1979 Suzuki GS750E
              1978 Kawasaki KZ650 C2
              1977 HD CR1000
              1977 Kawasaki KZ400
              1974 Honda CB750

              Comment

                #8
                The only time my old 1100e ever hit 320 was in ridiculous traffic in ridiculous heat. its been a long time, but I seem to recall that it ran on the lower end to maybe the middle of the scale.
                sigpic
                When consulting the magic 8 ball for advice, one must first ask it "will your answers be accurate?"

                Glen
                -85 1150 es - Plus size supermodel.
                -Rusty old scooter.
                Other things I like to photograph.....instagram.com/gs_junkie
                https://www.instagram.com/glen_brenner/
                https://www.flickr.com/photos/152267...7713345317771/

                Comment

                  #9
                  Originally posted by 82Suzie View Post

                  Could the sensor need to be replaced or is that normal operating temperature?


                  Rick
                  If it is correct, 320 degF is way too high. @210-220 is much more comfortable with 270-280 degF max in the summer. This is especially true for a small displacement 16V like at 750. With a Series R/R and small oil cooler a 1166 high compression engine stays within these ranges and the size and cooling areas are nearly equivalent.

                  You are either suffering from an electrical problem or low oil pressure causing heating problems. My 1981 GS750EX did not have a temperature gauge but it did have an idiot light and as best I could tell it ran very cool no matter how bad I flogged it.

                  Do you have a factory manual? It tells how to test yoru meter and sensor. And a handlebar volt meter will give you an indication about your electrical system.

                  Failing doing any of that you could probably find a psychiatrist for the bike. Maybe he would have a volt meter.

                  Comment

                    #10
                    I tested the oil temp gauge and it checked out AOK. I went and tightened it down to the sensor real tight.
                    I'm hoping it was just too loose. I'll ride her again Tuesday.
                    1982 Suzuki GS750E
                    1979 Suzuki GS750E
                    1978 Kawasaki KZ650 C2
                    1977 HD CR1000
                    1977 Kawasaki KZ400
                    1974 Honda CB750

                    Comment

                      #11
                      Ran it at 70-75 mph for 10 miles and the temp gauge hit 320 again.
                      I talked it over with a MC mechanic I know well and I suspect a defective OT sensor.
                      I bought a used one and will install it over the weekend, and test ride again.
                      1982 Suzuki GS750E
                      1979 Suzuki GS750E
                      1978 Kawasaki KZ650 C2
                      1977 HD CR1000
                      1977 Kawasaki KZ400
                      1974 Honda CB750

                      Comment

                        #12
                        Issue resolved.
                        I studied the wiring diagram and went over everything and found a wiring coupling located in the headlight shell that while it appeared fastened, really wasn't.
                        Pressed both sides until I heard a click and the problem was solved.
                        Took Suzie out for attest ride and enjoyed myself. Temp gauge slowly rose to 210 and stayed there.
                        1982 Suzuki GS750E
                        1979 Suzuki GS750E
                        1978 Kawasaki KZ650 C2
                        1977 HD CR1000
                        1977 Kawasaki KZ400
                        1974 Honda CB750

                        Comment

                          #13
                          Glad you got it fixed. The small stuff always takes the longest to get sorted.

                          Comment

                            #14
                            Nothing like reading a resolution. Almost makes me feel like I accomplished something of my own Glad you got it figured out

                            Comment

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