Announcement

Collapse
No announcement yet.

piston ring end gap spec

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    piston ring end gap spec

    in the 650 service manual when you look for piston ring end gap it gives a serviceable limit instead of a spec that they should be between, the serviceable limit is .7mm and when measuring my piston rings that came with my bigbore kit i get a end gap of .165mm, my pistons are cast and i was told by the guy in the shop i brought my cylinders to that since i am using cast pistons i will want to be on the tighter end of the spec that the bike will like it more, well i dont have a spec to actually go off of lol.

    got to see a barn find yamaha xs1 all stock with the yellow paint and a red kz900 with a exhaust at the shop i brought my cylinders to, real cool bikes.
    Ian

    1982 GS650GLZ
    1982 XS650
    Tags: None
    #2
    Rough rule of thumb, iirc, is 4 thou per inch of bore for the gap, subject to a maximum as in the service manual.
    ---- Dave

    Only a dog knows why a motorcyclist sticks his head out of a car window
    • Likes 1

    Comment

      #3
      what do i go based off of though? all it tells me is when to replace the rings but i dont know what the clearance is on a new motor and id like to go based off of that.

      do i go off diameter or ci for that rule if theres no spec? my cylinders are 185 cc each.
      Ian

      1982 GS650GLZ
      1982 XS650

      Comment

        #4
        Bore diameter, in this case, inches.
        ---- Dave

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

        Comment

          #5
          i cant seem to find my tape measure but its about 2 and a half inches in diameter so itd be .001 but how do i use that when i dont know the normal end gap clearance? i wish there was a stock spec i can go off of but i cannot find an actual spec they should be between on the oem service manual.
          Ian

          1982 GS650GLZ
          1982 XS650

          Comment

            #6
            timebombprod, if you're referring to your Suzuki GS650GL, the bore is 62 mm. Which would be approximately 2.44 inches.
            1981 Suzuki GS650G

            Comment

              #7
              Cylinders have been over-bored. See post # 1
              Rich
              1982 GS 750TZ
              2015 Triumph Tiger 1200
              BikeCliff's / Charging System Sorted / Posting Pics
              Destroy-Rebuild 750T/ Destroy-Rebuild part deux

              Comment

                #8
                Originally posted by Rich82GS750TZ View Post
                Cylinders have been over-bored. See post # 1
                Ahh, missed that. So 2.44 inches plus amount of overbore in inches.
                1981 Suzuki GS650G

                Comment

                  #9
                  A quick look at the FSM on Basscliff's website shows these specs for the rings......

                  snap_screen_20220617224612.png
                  1978 GS1085.

                  Just remember, an opinion without 3.14 is just an onion!

                  Comment

                    #10
                    Contact the Manu. of your bore kit. Iirc my wiseco set has different req. than oem.
                    must install them someday or do the Millyard youtuber hack saw it into a v8
                    1983 GS 550 LD
                    2009 BMW K1300s

                    Comment

                      #11
                      2.5" would give about 10 thou, not 1. This is only a guide though, it's not set in stone.
                      Could well be the makers have specified a different gap.
                      ---- Dave

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

                      Comment

                      Previous template Next
                      Working...
                      X