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Search results

  1. D

    Sealing of Cylinder Sleeve

    General question on practice within the GS group. I have my cylinders off as I tear down the engine to replace the broken rear cam chain guide. My uncle is a mechanical engineer who has done full restoration of Honda CB's. He is recommending that I heat the cylinders and then use green loctite...
  2. D

    Rear Cam Chain Guide Broke in Half - How to Remove?

    I suspected the no. 3 intake valve was bent due to the timing jump and significant loss of compression in that cylinder. The number 3 intake valve clearance changed from 0.1mm to 0.24mm after the timing jumped suggesting that the valve was no longer fully seating. Visually, I can't see that in...
  3. D

    Timing Chain Jump at Crankshaft

    I have ordered one. Hope it is in good shape.
  4. D

    Rear Cam Chain Guide Broke in Half - How to Remove?

    Sounds like I have some more work to do. Will keep digging down and see what I find, but the manual definitely shows splitting the case to remove this guide and dampers.
  5. D

    Rear Cam Chain Guide Broke in Half - How to Remove?

    Just pulled off the head of my 81 GS650L and found that the cam chain guide has broken in half. Doe the engine need to be torn down further to get this piece out and replaced?
  6. D

    Timing Chain Jump at Crankshaft

    Pulled off the head today. The chain guide for the cam tensioner is snapped in half right where the tensioner would press against it. Does not look like much availability for this part...
  7. D

    Timing Chain Jump at Crankshaft

    The previous owner had the bike for 30 years. I don't think he did anything except for oil changes and tires, so everything else is just age and neglect. Thanks for the link on the tensioner re-build. Your site is invaluable. Dave
  8. D

    Timing Chain Jump at Crankshaft

    Looks like I have plenty of work to do now!
  9. D

    Timing Chain Jump at Crankshaft

    Crankshaft now at TDC.
  10. D

    Timing Chain Jump at Crankshaft

    Rotate crankshaft to TDC, Marks 2 and 3 rotated ahead.
  11. D

    Timing Chain Jump at Crankshaft

    Crankshaft not at TDC.
  12. D

    Timing Chain Jump at Crankshaft

    Marks 2 and 3, 20 pins apart.
  13. D

    Timing Chain Jump at Crankshaft

    Exhaust cam mark 1 aligned with head gasket.
  14. D

    Timing Chain Jump at Crankshaft

    This is a continuation of my thread at http://www.thegsresources.com/_forum/showthread.php?245453-GS650L-Intake-valve-not-seating about the loss of compression in the #3 cylinder and sudden poor running of the engine. I took a look at the timing tonight, not good. The timing jumped and most...
  15. D

    GS650L - Intake valve not seating

    The bucket spins freely and can push it down easily with the bucket depressor tool, but does not help restore the proper valve clearance.
  16. D

    GS650L - Intake valve not seating

    Yes, the valve does not appear to be coming back up all the way. Top of the piston looked fine and nothing inside the cylinder.
  17. D

    GS650L - Intake valve not seating

    I have had this 1981 GS650L for a couple of years now tinkering with the engine and bringing things up to spec. I am now having an issue with the #3 intake valve. When I got the bike, valve clearance on this valve was 0.05mm which I adjusted to 0.10 mm. The bike was running well until it...
  18. D

    81 GS650L - Compression Low on Cylinder 3? New Issue.

    Just had enough time to take the valve cover off tonight and poke around a bit. If anything the the #3 intake loosened up a bit, but everything else stayed the same. The timing marks are still aligned with 20 chain pins between the 2 and 3 marks, but it is much harder to rotate the engine with...
  19. D

    81 GS650L - Compression Low on Cylinder 3? New Issue.

    Valves were adjusted when I first started working on the bike. Most valves required adjustment, but should all be to the high end of spec now. Just went back to my valve adjustment notes. Cylinder 3 has 0.1mm on both the exhaust and intake valves after adjustment. Both measured 0.05mm at the...
  20. D

    81 GS650L - Compression Low on Cylinder 3? New Issue.

    Well, my fun with the 81 GS650L appears to be short-lived. Last weekend I completed my coil relay mod and R/R replacement and then went for a fun 40 mile ride. Was ready to just jump on and ride today, but only made it about 8 miles before I lost power and the engine was running rough. Luckily I...
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