Results 1 to 2 of 2

Thread: 1985 K100RS valve clearance check advice needed.

  1. #1

    1985 K100RS valve clearance check advice needed.

    I checked my valve clearances today. Intakes were all .15 go and .20 no-go. The exhausts were all .25 go and .30 no-go. My issue was that #4 exhaust was a .25 go with effort but it did go. I do know that the 2-valves tend to tighten over time and I'd rather not run the risk of burning an exhaust valve. Will I be okay? Bike has 30K miles and I can't tell you when they were last checked and what those clearances would have been. I am going to go back in and get out some different gauges and try to determine what it actually is by comparing the relative resistance felt with the .25 gauge on valves 1-3.

    Thanks,
    Tom

  2. #2
    3 Red Bricks
    Join Date
    Jan 2007
    Location
    Pleasanton, Ca.
    Posts
    4,884
    Tom,

    I prefer to use inch feeler gauges vs metric. Set the intakes to .006-.008" and the exhausts to .010-.012" with .012" being highly preffered.

    The advantage of using inch feeler gauges, besides being cheaper and easier to find at any car parts store or Harbor Freight, is you have the ability to more accurately measure the clearances instead of using go-no go method. You can determine if the clearance is .225mm (.009"), .25mm (.010"), .275mm (.011"), .30mm (.012"), etc.

    Even though the spec for exhausts are .010"-.012", you are better off shooting for .012" since the exhausts always want to tighten. Since the shims only come in .05mm (.002") increments, if the exhaust is at .010", change it to .012". If it is .011", leave it.



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

Similar Threads

  1. 18,000 mile valve clearance check....
    By dughuze in forum Straight 6 K1600 GT/GTL/B
    Replies: 3
    Last Post: 10-17-2017, 01:57 PM
  2. 2013 R1200RT - valve clearance check? And changing trans oil?
    By NATHANMONK in forum Hexheads/Camheads
    Replies: 2
    Last Post: 01-24-2014, 04:46 AM
  3. Help/advice needed for 1985 K100 clutch/main seal replacement
    By tbendien in forum Flying Brick K-bikes
    Replies: 7
    Last Post: 01-26-2010, 04:04 PM
  4. No Clearance On 1st Valve Check
    By Geoff in forum Airheads
    Replies: 8
    Last Post: 03-23-2009, 02:52 AM
  5. 1985 K100RS Valve Clearance Check and Possible Adjustment
    By 110066 in forum Flying Brick K-bikes
    Replies: 2
    Last Post: 09-12-2004, 04:06 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •