Valve Stem Seal Replacement

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  • IanDMacDonald
    XS-XJ Super Guru
    • Oct 2010
    • 3970
    • Grand Blanc & Fenton, MI
    #1

    Valve Stem Seal Replacement

    I'm going to nab a cylinder head off one of my spares. I'll ensure it's clean, but I'm debating on pulling the valves and replacing the valve stem seals. Any thoughts on whether this is necessary?

    I'm also contemplating going one step further and pulling the cylinders and checking tbe rings, and possibly rehoning the cylinders.

    Thoughts?
    1979 XS1100F
    2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
    Tags: None
    • IanDMacDonald
      XS-XJ Super Guru
      • Oct 2010
      • 3970
      • Grand Blanc & Fenton, MI
      #2
      Rah. Quite the rabbit hole! I'm comtemplating pulling the jugs, but the labor involved in honing & reinstalling the pistons may not be worth it, especially if everything looks okay . . .
      1979 XS1100F
      2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.

        Comment

        • Radioguylogs
          XS-XJ Guru
          • Nov 2012
          • 2143
          • Presque Isle, MI
          #3
          I feel valve seals are definitely worth doing while the head is off. You know I just had to replace the valve seals on my SF, so maybe I'm not the guy to ask.

          Regarding the piston rings,.... If this is the big bore engine, I'd be inclined to keep it "as is" due to the unique rings.

          If it's not the big bore engine, I'd make a decision based on the amount of miles on the engine. If it was less than 30k or so, I'd be inclined to keep the original rings. If it was over 40k miles, I'd consider a re-ring. Just my feeling, not based on any unique knowledge. I can say I did a re-ring on and XS750 @ 20k miles because the base gasket was leaking, so the jugs had to come off. Those cylinders were 0.001 out of round at the top and bottom, perpendicular to the wrist pin.
          -Mike
          _________
          '79 XS1100SF 20k miles
          '80 XS1100SG 44k miles
          '81 XS1100H Venturer 35k miles
          '79 XS750SF 17k miles
          '85 Honda V65 Magna ~7k miles
          '84 Honda V65 Magna 48k miles (parts bike)
          '86 Yamaha VMAX 9k miles

          Previous: '68 Motoguzzi 600cc + '79 XS750SF 22k miles +'84 Honda V65

            Comment

            • bikerphil
              Master of XSology
              • Jan 2008
              • 8904
              • South Flori-DUH
              #4
              100% do the valve seals, not the guides, they last forever.
              2H7 (79) owned since '89
              3H3 owned since '06

              07 Triumph Tiger 1050 (night rider)

              "If it ain't broke, modify it"

              ☮

                Comment

                • IanDMacDonald
                  XS-XJ Super Guru
                  • Oct 2010
                  • 3970
                  • Grand Blanc & Fenton, MI
                  #5
                  Thanks, gents! It is the big bore engine. I think I'll leave the cylinders alone.
                  1979 XS1100F
                  2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.

                    Comment

                    • IanDMacDonald
                      XS-XJ Super Guru
                      • Oct 2010
                      • 3970
                      • Grand Blanc & Fenton, MI
                      #6
                      Pulled a head off one of my parts bikes engine. I'll pull the valves out tomorrow, then soak the head and scrub it down. Chase all studs, replace valve seals, check valve lash and paint it. Should be ready to go back on the bike by next week.
                      1979 XS1100F
                      2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.

                        Comment

                        • Bonz
                          XS-XJ Super Guru
                          • Apr 2008
                          • 3308
                          • Palmer Lake, Colorado
                          #7
                          Way to turn and burn! I had a cam cap bolt snap in the head on a different bike years ago. The rest of them came out tight, some of them waisted in the middle. Ordered used head off ebay.

                          Torque wrench should have been set at about 9 ft lb, it was way high for whatever reason on cam cap install when putting ZZR1200 cams in the ZRX1200. I cannot recall or explain to this day. Didn't want to take a chance reusing it or retapping the one that broke once I got it out.
                          Last edited by Bonz; Yesterday, 08:46 PM.
                          Howard

                          2001 ZRX 1200
                          1982 Seca 750
                          1983 Nighthawk 550

                            Comment

                            • IanDMacDonald
                              XS-XJ Super Guru
                              • Oct 2010
                              • 3970
                              • Grand Blanc & Fenton, MI
                              #8
                              Originally posted by Bonz
                              Way to turn and burn! I had a cam cap bolt snap in the head on a different bike years ago. The rest of them came out tight, some of them waisted in the middle. Ordered used head off ebay.

                              Torque wrench should have been set at about 9 ft lb, it was way high for whatever reason on cam cap install when putting ZZR1200 cams in the ZRX1200. I cannot recall or explain to this day. Didn't want to take a chance reusing it or retapping the one that broke once I got it out.
                              I bought thead chases and dies to go over every thead and hole, prior to install, just in-case.
                              1979 XS1100F
                              2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.

                                Comment

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