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Cross Threaded Plugs?? Help

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    Cross Threaded Plugs?? Help

    Ok I'm in a bit of a panic right now. I was just doing some cleaning on my head, about to reinstall and I noticed that cylinder #3 spark plug threads appear to be cross threaded! It was running ok before this rebuild (minus oil leak/burn) and I don't remember having difficulty tightening any of these plugs in the past. What are my options here? I just installed my valve seals, lapped my valves and had about $200 of work done at the machine shop extracting some snapped bolts....

    I have a really nice set of Mac Tools tap and dye(sp?) set that I'm harrowing from a friend to chase and clean my threads. So I guess maybe I could rethread it? So like I said before.. What are my options?

    Thanks a lot for any advice.

    #2
    Grease up the tap to catch any chips, thread carefully.

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      #3
      NAPA SAVE-A-THREAD KIT. Put the steel sleeves in and be done with it..and its even more convenient seeing the head is already off. Use the longest insert. And keep the packaging to order new inserts if needed later.


      MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
      1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

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      I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

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        #4
        Just to be sure. 14 x 1.25 IS the thread of my plugs correct? (81 gs750L)

        Comment


          #5
          Originally posted by Weeksz View Post
          Just to be sure. 14 x 1.25 IS the thread of my plugs correct? (81 gs750L)
          No. D8EA plugs are 12mm X 1.25mm thread.

          The eight-valve engines take a different plug (B8ES) that has a 14mm X1.25mm thread.
          1983 GS850G, Cosmos Blue.
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            #6


            $119.00??! How is the 14 x 1.25 $25?

            Comment


              #7
              I started to cross thread a plug and here is how I fixed it easily without removing the head.

              http://www.dotheton.com/forum/index.php?topic=59700.0

              Comment


                #8
                Not much use now but for the future I always start plugs with a foot of garden hose. It's much easier to see whats going on and place the plug bang on the hole - right, you really did clean the seat in there - and you're never going to cross a thread. It also helps removing them to use it for the last few threads - stops them falling out of sockets and rattling around the fins on pots 2 & 3 of 4 pot mills.
                97 R1100R
                Previous
                80 GS850G, 79 Z400B, 85 R100RT, 80 Z650D, 76 CB200

                Comment


                  #9
                  That'ts a good suggestion. Although I don't think that I was the culprit behind the cross threading. They never went in forcefully the few times I had them out before I started my rebuild. I guess it could have been me but I dk.. Just called the machine shop and they said $35 so i'm just gonna go with that.

                  Comment


                    #10
                    Originally posted by Weeksz View Post
                    http://www.nationaltoolwarehouse.com...mm-P14322.aspx

                    $119.00??! How is the 14 x 1.25 $25?
                    Lower demand - millions of M14 plug holes out there and relatively few M12 - possibly higher production cost, but certainly more competition on price. And because they can, of course.
                    The ordinary M12 x 1.25 insert kit is more of a competitive price
                    but a fixed length of insert (18mm) with it.
                    ---- Dave

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

                    Comment


                      #11
                      Try one of these first:

                      Johno

                      current rides 1981 GS1000G and 2005 GSX1400
                      1977 Kawasaki KZ400 D4

                      previous bikes 1978 GS1000HC
                      1977 GS400
                      1974 Montesa 250
                      1960s Kawasaki 175

                      Comment


                        #12
                        Problem with thread chaser is that it is only safe to use with the with the head off the motor.

                        Comment


                          #13
                          Originally posted by Scratcher09 View Post
                          Problem with thread chaser is that it is only safe to use with the with the head off the motor.
                          News to me! I've only used mine with the engine intact.
                          Johno

                          current rides 1981 GS1000G and 2005 GSX1400
                          1977 Kawasaki KZ400 D4

                          previous bikes 1978 GS1000HC
                          1977 GS400
                          1974 Montesa 250
                          1960s Kawasaki 175

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