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    #46
    Ok I was watching videos. Getting more confused

    Jim, thank you for the details.

    I got 3.7 ohms on the primary side of both coils.

    Dave. I believe the caps are resistors (think I read that somewhere about my bike). So I took them off.
    meter set so 200K
    probes in the 1& 4 leads 11.6
    probes in the 2 & 3 leads 11.8

    I then measured just each cap by itself at, meter at 200K:
    1- 11.5
    2- 8.7
    3- 9.5
    4- 8.5

    Someone tell me if this is what I should expect. Or is there something wrong here. Either with the numbers, my testing method, or both.

    I also got the lid off carb # 4 and pulled the plunger. Diaphragm is in perfect condition.

    Last edited by Rich82GS750TZ; 09-19-2023, 11:17 PM.
    Rich
    1982 GS 750TZ
    2015 Triumph Tiger 1200

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

    Comment


      #47
      Caps are dead or corroded. They corrode internally get some ngk equivalents.
      1983 GS 550 LD
      2009 BMW K1300s

      Comment


        #48
        The caps should be 5k ohms. You may have corrosion inside the cap. I've read here, but never verified, that the small resistor element can be removed and cleaned. That may be worth a try before trying to chase down new caps. I've also read that NGK has discontinued selling old style plug caps like our bikes use, so finding some may take a little work.

        Edit: found this thread showing the cap taken apart, with the resistor element exposed...

        Last edited by Nessism; 09-20-2023, 10:31 AM.
        Ed

        To measure is to know.

        Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

        Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

        Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

        KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

        Comment


          #49
          I will do my best to clean up the screw end and the plug cap ends of the caps, see if I can get closer to 5k ohms.
          If there is a write up or pictures somewhere of removing/cleaning the resistors, I haven't seen it. It's not apparent to me how that can be done.
          Then, again, I didn't know you could just unscrew the caps. I will also clip about 1/4" to 1/2" off of each lead before reinstalling the caps. Have read that that's a good idea.

          So if each caps should give me 5k ohms resistance, and I'm getting 11.7 average in the leads, I should get 5+5+11.7 = 21.7k ohms when measuring 1-4, and 2-3? Is that how the math works?
          Redman posted above a numbers 5cap+5cap+25leads = 35k ohms. Is that where I should be for the secondary resistance?

          Let me clean things up when I get home today, put the caps back on, measure again and see what I have.

          This all has to be looked at part of the whole, I know I'm still looking at rebuilding the head of one of my engines, rings, etc.

          Figured I'd just try to nail down and potential coil issues now, while I have these parts apart.

          I guess I could just buy something like (2) pairs of these. Unless I need to replace the leads as well.
          https://www.amazon.com/labwork-Spark-Resistor-Degree-Motorcycle/dp/B08JSFFV1V/ref=sr_1_2?crid=3S5ZEJUTYIFPP&keywords=ngk+spark+p lug+resistor+boot+motorcycle&qid=1695221755&sprefi x=ngk+spark+plug+resistor+boot+motorcycle%2Caps%2C 68&sr=8-2

          Well, not those boots exactly, Most of the reviews say they're garbage.

          This one looks like the real deal:

          Last edited by Rich82GS750TZ; 09-20-2023, 11:03 AM.
          Rich
          1982 GS 750TZ
          2015 Triumph Tiger 1200

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

          Comment


            #50
            Rich,

            Check the plug caps and see if there isn't a brass fitting that goes on the plug with a screwdriver slot in it. You can just unscrew the brass fitting and the resistor will be under it. Normally there is a spring in there also. I use a short piece of heavy copper wire to replace the resisitor.
            Ron
            When I die, just cremate me and put me in my GS tank. That way I can go through these carbs, one more time!https://www.thegsresources.com/_forum/core/images/smilies/cool.png
            1978 GS750E - November 2017 BOTM
            1978 GS1000C - May 2021 BOTM
            1982 GS1100E - April 2024 BOTM
            1999 Honda GL1500SE

            Comment


              #51
              Originally posted by Rich82GS750TZ View Post

              Dave. I believe the caps are resistors (think I read that somewhere about my bike). So I took them off.
              meter set so 200K
              probes in the 1& 4 leads 11.6
              probes in the 2 & 3 leads 11.8

              I then measured just each cap by itself at, meter at 200K:
              1- 11.5
              2- 8.7
              3- 9.5
              4- 8.5
              Just for clarification, at the 200k setting, all your measurements should have a “k” on the end of them.
              So your resistance measurement for the 1 & 4 wires and coil would be 11.6k ohms, or 11,600 ohms.

              Using my handy dandy little calculator your 11.6k ohms plus the resistance of the 1 & 4 caps comes to 31.6k ohms.
              The Manual on BikeCliff’s web site specs 30k-35k ohms.

              Jim, in Central New York State.

              1980 GS750E (bought used June,1983)
              1968 CB350 Super Sport (bought new Oct,1968)
              1962 CA77 305 Dream (bought used Feb,1963)

              Comment


                #52
                Jim, thank you. Looks like I’m in the ball park. Will just clip fresh ends on the leads, reinstall the caps and call the coils/caps good/ not involved in my recent engine failure.

                Ron, thanks. Will will look more closely when I get home.
                Last edited by Rich82GS750TZ; 09-20-2023, 11:48 AM.
                Rich
                1982 GS 750TZ
                2015 Triumph Tiger 1200

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

                Comment


                  #53
                  Rich,

                  some comments:

                  - I do recall discussion/situation about something NLA, either plugs without resistor or caps with resistor. You want one to have the 5k, and not both have 5k, and not both have none.

                  - yours caps are well above 5k, and the worse one is in the 1-4 circuit, which is where is an apparent problem….. so….. I think you are about to become more familiar with the situation. Look for XB05F and VB05F (2 each) . These NGK caps are used by lots of bikes, so maybe can find them at local multi brand dealer. Longer ones are for center cylinders.
                  My experince is that if at 2 or 3 or 4 times the 5k they will still spark when test them, but present running problems, worse when engine hot, and are on way to completly failing. I can’t say anything about taking apart and cleaning, I replaced them at $5 apiece when ordering other stuff.

                  -yah, trim off just a little, 1/4th inch or 3/8th, from end of wire only if strands of conductors are damaged at the end (compare end to what maybe can see up in there a little bit). Don’t just do that for no reason cuz isn’t much extra length on those wires to do that more than a few times.

                  - my stated spec of 35k ohm cap to cap (5+25+5) is from my memory of 850g and 1100g. Have now verified that in my 1100G FSM says 30k-40k. I don’t know if your T (4 valve per cylinder) uses a different coil or not being more of a higher performance engine.
                  FSM doesn’t acknowledge anything about the caps as a separate item.

                  - some folks may say the resistor in the circuit (either cap or plug) is just to reduce radio interference on AM radios, which it does. But I have reason to suspect is also needed for best operation, but I don’t really know.

                  - when measuring something less than 20k, I don’t think it much matters if use the 20k scale or the 200k scale, other than how many decimal digits (assuming good batterys in meter). But before someone suggests you need to use the lower scale, you can try both and see if much difference.

                  - your caps are something to be aware of, and replace because are easy and cheap (and before completly fail)…. But your preliminary compression check (thumb) seems like a more critical situation.​
                  Last edited by Redman; 09-20-2023, 12:58 PM.
                  http://webpages.charter.net/ddvrnr/GS850_1100_Emblems.jpg
                  Had 850G for 14 years. Now have GK since 2005.
                  GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


                  https://imgur.com/YTMtgq4

                  Comment


                    #54
                    Dave, I believe I'll take your recommendation. I found the XB05F on Amazon for 12.88/pr. Look good to you?

                    All 4 caps on my bike seem to be of the longer variety XB05F. But I will measure before I order.

                    https://www.amazon.com/marddpair-Resistor-Replacement-Degree-Motorcycle/dp/B09FG4QSXT/ref=sr_1_2?crid=30ZT3JRQ4992O&keywords=XB05F&qid=1 695228575&sprefix=xb05f%2Caps%2C184&sr=8-2
                    Last edited by Rich82GS750TZ; 09-20-2023, 12:57 PM.
                    Rich
                    1982 GS 750TZ
                    2015 Triumph Tiger 1200

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

                    Comment


                      #55
                      Originally posted by Redman View Post
                      Look for XB05F and VB05F (2 each) . These NGK caps are used by lots of bikes, so maybe can find them at local multi brand dealer. Longer ones are for center cylinders.
                      The VB and XB plug caps are for 14mm spark plugs like B8ES. The 16V GS engines, use the smaller 12mm thread plugs, D8EA, so the appropriate matching NGK caps are VD and XD
                      Ed

                      To measure is to know.

                      Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                      Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                      Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                      KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                      Comment


                        #56
                        Regarding the caps. A few years ago I was chasing a running issue and went thru what you're doing now with the caps / coils. I had to clean corrosion from three even though they were close to spec. The fourth was was bad even after cleaning. At the time they were still available new from the local Suzuki dealer but for more then the price you found for the NGKs. ($25 if I recall). The rubber seals at the bottom of the caps were in poor condition and allowing moisture into the cap. The seals are / were available separately.
                        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


                          #57
                          Ed, so should I get 4 of these: I can shop around, these are 19.95/each but they are actual NGK plug caps.

                          https://www.amazon.com/Spark-Resistor-Cover-Degree-XD05F/dp/B07GFQWQ4V/ref=sr_1_1?crid=2WNH88I1CY58A&keywords=ngk+xd05f&q id=1695222052&sr=8-1
                          Rich
                          1982 GS 750TZ
                          2015 Triumph Tiger 1200

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

                          Comment


                            #58
                            Originally posted by Rich82GS750TZ View Post
                            Ed, so should I get 4 of these: I can shop around, these are 19.95/each but they are actual NGK plug caps.

                            https://www.amazon.com/Spark-Resistor-Cover-Degree-XD05F/dp/B07GFQWQ4V/ref=sr_1_1?crid=2WNH88I1CY58A&keywords=ngk+xd05f&q id=1695222052&sr=8-1
                            Crazy over price.
                            go to a local bike or speed shop.
                            1983 GS 550 LD
                            2009 BMW K1300s

                            Comment


                              #59
                              Originally posted by Nessism View Post

                              The VB and XB plug caps are for 14mm spark plugs like B8ES. The 16V GS engines, use the smaller 12mm thread plugs, D8EA, so the appropriate matching NGK caps are VD and XD
                              Ed, Thanks for correcting my ignorance from only having 650g 850g 1100g. I didn’t know the 16valve engines used different size plugs (needed more room for the valves hee hee)

                              Rich, Yah, what Ed said.
                              Yah can use four of the longer caps, just that will stick out further than need to (on 8 valve anyway), not a problem unless you are tall and your knee is right there.
                              also note what Ed said about spark plug size, that is what a compression tester will need to fit (most kits have multiple adapters).

                              has been a few years, but I recall the plug caps being 4 or 5 bucks each.

                              other thing to be aware of: some plugs have a thin threaded stud for the wire connector, some have the hour glass shaped more cylindrical connector, the plugs I am accustom to has the hour glass shaped cylindrical thing threaded onto the threaded stud and need to take that off so have the threaded stud….. to be compatable with the plug cap I am accustom to. But since the more knolodgable people haven’t mentioned it, I suppose isn’t a concern with what they have specified.


                              Last edited by Redman; 09-20-2023, 04:09 PM.
                              http://webpages.charter.net/ddvrnr/GS850_1100_Emblems.jpg
                              Had 850G for 14 years. Now have GK since 2005.
                              GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


                              https://imgur.com/YTMtgq4

                              Comment


                                #60
                                Originally posted by Rich82GS750TZ View Post
                                Ed, so should I get 4 of these: I can shop around, these are 19.95/each but they are actual NGK plug caps.

                                https://www.amazon.com/Spark-Resistor-Cover-Degree-XD05F/dp/B07GFQWQ4V/ref=sr_1_1?crid=2WNH88I1CY58A&keywords=ngk+xd05f&q id=1695222052&sr=8-1
                                Hey Rich,

                                Before spending that much, I'd open up your caps and try to clean them out. You don't have anything to loose! If that fails, buy new.
                                Ed

                                To measure is to know.

                                Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                                Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                                Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                                KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                                Comment

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