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    #16
    Originally posted by Grimly View Post
    Bits of clutch fibre.
    My oil strainer was nearly clogged with it.
    You need to drop the sump and clean the strainer, else the engine will go terminal.
    Is there any way I can check if the engine isn't already terminal? It wasn't running and didn't come with a battery. I paid $100

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      #17
      Hey guys, just checking if anyone can chime in on what they think the culprit is in the pictures I posted. Bits of clutch in the oil, or the bits of the cam chain guides in the oil? Also if it ends up being the clutch, I'm gonna have to drop the sump and clean the strainer like grimly said. Is there a thread I can follow to reference that.

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        #18
        Have you tried to spin the engine with a 19mm socket on the right end of the crank shaft, so you at least know that the motor turns? You have to take the signal generator generator cover off first. Take the spark plugs out and put a finger over each hole, in turn, as you turn the crank. Standing at the right side of the bike, be sure to only turn the engine clockwise. You should feel suction, alternating with air blowing your finger off the spark plug hole as you turn the crank. If no go, decide if you want to go any further, a full tear down is in your future. If the engine spins, and you have compression, carry on.

        My best guess on the foreign substance, after seeing the pics, agree with Grimly, looks like maybe clutch drive plate friction material. Since you’ve already drained the oil, go ahead and take the clutch cover off and look at the plates, that will tell you. Also agree with dropping the oil pan and cleaning the oil pump strainer.
        Last edited by Rich82GS750TZ; 03-11-2021, 06:12 PM.
        Rich
        1982 GS 750TZ
        2015 Triumph Tiger 1200

        BikeCliff's / Charging System Sorted / Posting Pics
        Destroy-Rebuild 750T/ Destroy-Rebuild part deux

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          #19
          Yep, and even if the strainer turns out to be clear, at least you KNOW it's clear, and needn't worry about it.
          Honestly, I was quite surprised at the amount of muck trapped in mine, as the engine hadn't given the slightest sign of trouble, but if I'd left it for another year or two, it might have been a write-off.

          ---- Dave
          79 GS850N - Might be a trike soon.
          80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
          79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
          92 XJ900F - Fairly Stock, for now.

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

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            #20
            The motor turns. The right side spark plug holes have suction, the Left side it’s hard to tell if it has good suction, not sure if my finger was covering the hole that great. But they still blow air out. Also the inside of the clutch cover is nasty and the same as the oil filter area.

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              #21
              Originally posted by BlackThunder View Post
              The motor turns. The right side spark plug holes have suction, the Left side it’s hard to tell if it has good suction, not sure if my finger was covering the hole that great. But they still blow air out. Also the inside of the clutch cover is nasty and the same as the oil filter area.
              If it was my project I'd do a compression test to see if there's anything wrong with the cylinder bores or rings, you can do this by jump starting off a battery to spin the engine. If that turns out OK then I'd be looking to do what has already been suggested and dropping the pan to clean out the screen and anything else I can get a clean rag into to wipe that crud off. Then I'd run some kerosene through it to clean up the oiling system (with the starter turning the engine over) followed by another flush with a low cost motor oil that'll flush out the kerosene.
              1980 Yamaha XS1100G (Current bike)
              1982 GS450txz (former bike)
              LONG list of previous bikes not listed here.

              These aren't my words, I just arrange them

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                #22
                Do I need to fill it back up with oil for the compression test?

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                  #23
                  Trying to do the compression test. But nothing happening when hitting the start button. Headlight taillights an turn signal work, horn trying to work.

                  What connects to the 2 prong connector under the right handlebar? There’s nothing connected right now.

                  Comment


                    #24
                    Originally posted by BlackThunder View Post
                    Trying to do the compression test. But nothing happening when hitting the start button. Headlight taillights an turn signal work, horn trying to work.

                    What connects to the 2 prong connector under the right handlebar? There’s nothing connected right now.
                    I'm assuming you're referring to the green/yellow wires that go to the engine kill switch, you could just connect those or jumper them together to complete the circuit to the starter relay.

                    As to oil in the engine I'll let someone else chime in on that one in order to avoid being bombarded with out dated produce. You should probably run a google search or look around on youtube for instructions on doing a compression test. Generally you test it as-is then put some oil in the cylinders through the spark plug holes to help seal up any scoring on the cylinder walls.
                    1980 Yamaha XS1100G (Current bike)
                    1982 GS450txz (former bike)
                    LONG list of previous bikes not listed here.

                    These aren't my words, I just arrange them

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                      #25
                      I wouldn't have thought a compression test is going to tell you much at this point. You said you're going to pull the engine apart? If so you'll be able to see as you go. They are incredibly hard to kill.

                      My guess for what's in your oil is oil varnish. Too much to be part of the chain guides. Could be the remains of an old filter that's broken down. They are very hard to tune with those pods I see fitted, likely it was never jetted right.

                      Taking the oil pan off is easy. A bunch of 10mm bolts, tap it with a mallet & pull it off. You'll see the strainer as soon as you do. Good luck!
                      1980 GS1000G - Sold
                      1978 GS1000E - Finished!
                      1980 GS550E - Fixed & given to a friend
                      1983 GS750ES Special - Sold
                      2009 KLR 650 - Sold - gone to TX!
                      1982 GS1100G - Rebuilt and finished. - Sold
                      2009 TE610 - Dual Sporting around dreaming of Dakar.....

                      www.parasiticsanalytics.com

                      TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

                      Comment


                        #26
                        Originally posted by salty_monk View Post
                        I wouldn't have thought a compression test is going to tell you much at this point.
                        My thinking in suggesting it is to see if it's already toasted before going any further time and money wise.
                        1980 Yamaha XS1100G (Current bike)
                        1982 GS450txz (former bike)
                        LONG list of previous bikes not listed here.

                        These aren't my words, I just arrange them

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                          #27
                          I did the screwdriver bypass trick... from my tests each cylinder was at around 120. This is my first time doing a compression test. Also remember that the compression test I did was with the exhaust (Vance heins, 4-1) removed. Is that decent compression?

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                            #28
                            120 is the lower end of spec. I’d expect that with the way you’re doing it. The fact that they match is good....
                            1980 GS1000G - Sold
                            1978 GS1000E - Finished!
                            1980 GS550E - Fixed & given to a friend
                            1983 GS750ES Special - Sold
                            2009 KLR 650 - Sold - gone to TX!
                            1982 GS1100G - Rebuilt and finished. - Sold
                            2009 TE610 - Dual Sporting around dreaming of Dakar.....

                            www.parasiticsanalytics.com

                            TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

                            Comment


                              #29
                              If it's been sitting awhile you might see that number go up after you have it up and running. At 120psi I'd move forward starting with the engine first before investing in tires, etc.
                              1980 Yamaha XS1100G (Current bike)
                              1982 GS450txz (former bike)
                              LONG list of previous bikes not listed here.

                              These aren't my words, I just arrange them

                              Comment


                                #30
                                I plan on starting the engine first . My first step I initially wanted to try and get this broken exhaust stud out, but after doing some searching I think it might be better to take the head to a shop to have them remove it. It’s broken off flush so from what I’m gathering from other searches the favorite method here is to weld a nut on. Second option is to drill out and Tap. Ez out is not a good option. Tough decision... any suggestions

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