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Search results

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    New head for 1979 GS550 with bad spark plug threads?

    Below is with the head off, you can see that the prior owners have replaced the cylinder 3 with an insert, thus the bad compression. Visually the head looks in great shape and so do the pistons. Cylinder #3 is bottom, #4 you can see near the top and is much better. I'm guessing this doesn't...
  2. O

    New head for 1979 GS550 with bad spark plug threads?

    That was the other option I forgot to add. My concern is that there is already something in there, in the photo you can see knurled stuff on the outside. Looking closer down the hole its looks like the original threads. There is a bit of a dip from the surface to that ring that is knurled. Its...
  3. O

    New head for 1979 GS550 with bad spark plug threads?

    I have a 1979 GS550 that I've been working on and bringing back from about 8 years of not running and neglected. It's got about 22k on it. I've got it mostly running on 3 of the 4 cylinders. I did compression tests on all warm and cold, left to right is 120-120-70-120. It somewhat appears to...
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