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  • #1

    road to recovery

    after my top end issues i finally have things in the rebuild phases

    thanks to BA80 for the parts i needed!!!

    so far i have lapped in all the valves

    de burred the intake ports

    opened up very slightley the exaust ports and general de burring and clean up

    champhered the oil passages in the cam area and generaly ge gunked and detailed some of the rough areas on the cyl head

    couldnt believe how poorly the valves and seats where lapped from the factory.. really poorly done

    there was also alot of casting burs and lummpy bummpy areas in the head

    lots of burrs around any of the holes

    oh well fixed now!!!

    inspite of it all this has been alot of fun and a great confidence builder

    still need to have head and cyl hot tanked at machine shop

    light ball hone on cyl then paint and re assemble!!!

    never could get posting pics down but ill try

    hope to have bike back together and running in 2 weeks...
    Last edited by wjw11teen; 04-14-2014, 06:13 PM.
    81 SH gifted to SON
    Tags: None
  • #2
    Sounds like a short road! Congrats on getting her going. I remember Ras offering his congrats when I got mine going again. It felt great.
    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

    • #3
      I guess I can assume the head got there in one piece?
      Greg

      Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

      ― Albert Einstein

      80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

      The list changes.

      Comment

      • #4
        yessir it did!! showed up today!!

        pulled cams and an int. and ext. valve and everything going good!!

        thanks again Greg

        tomorrow im gonna use some diesel fuel and this bitchen air over liquid sprayer tool and wash out the bottom end...

        getting excited to see how much difference, if any, the little bit of port work ive done is gonna make
        81 SH gifted to SON

        Comment

        • #5
          Don't get too excited. These engines are already designed to be quite high performance as they are. They are already putting out over 1.4 HP per cubic inch.

          Some have spent thousands of $ modifying them and only gain 20 HP or so. I think the highest output I've seen from one of these is like 115 -120 HP.

          Your more than welcome. Glad I could help. (and clear more stuff out of my garage)
          Greg

          Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

          ― Albert Einstein

          80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

          The list changes.

          Comment

          • #6
            Originally posted by wjw11teen View Post

            getting excited to see how much difference, if any, the little bit of port work ive done is gonna make
            I don't know what you think you know about porting, but here is something that you might give some thought to.

            http://www.mototuneusa.com/power_news_--_think_fast.htm

            And please let us know what conclusions you come to.
            Have fun, CZ

            Comment

            • #7
              Some times it is true, bigger is not always better.

              The other Earl
              80SG, 81SH, 80 standard parts bike, 81SH parts bike
              and new to me 78 standard dresser

              Comment

              • #8
                Something I keep explaining to my wife, she's not convinced
                Tom
                1982 5K7 Sport, restored to original from a wreck
                1978 2H9 (E), my original XS11, mostly original
                1980 2H9 monoshocked (avatar pic)http://i145.photobucket.com/albums/r...psf30aa1c8.jpg
                1982 XJ1100, waiting resto to original

                Comment

                • #9
                  i only de burred the intake ports ..

                  i did how ever get a little more agressive in the exaust ports..although not alot..

                  i could have opened up the ex. ports ALOT to get them to match with the header I.D.

                  im not really expecting more H.P. mabey just a little better throttle responce..

                  jus tried to improve on what was already there..

                  got the cases washed out tonight now im thinking about the dremel mod for the trans..

                  i tried to lift the front of the bike with a ****ty old come along and it slipped and nearly caused my demise

                  thankfully no harm to the bike...not sure how im gonna get this thing stood up or fliped over...

                  how long does this mod generaly take?
                  81 SH gifted to SON

                  Comment

                  • #10
                    Opening the exhaust ports might help the top end of the RPMs but back pressure is the key to low end response.

                    If you aren't sure about the condition of the transmission don't mess with it until you know for sure. Don't do any mechanical mods "just because".

                    I've seen too many of these bikes end up as spare parts on ebay because a lot of engine mods were done BEFORE the owner knew what it needed.

                    Get it running good and tackle one thing at a time. Too much change can be a headache if there is a problem and you don't know if it was caused by something you did, or something that was there to begin with.

                    Be patient Grass Hopper.
                    Greg

                    Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                    ― Albert Einstein

                    80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                    The list changes.

                    Comment

                    • #11
                      It will usually take a good weekend, the prep, the teardown, the dremelling, and then the reassembly. With all of the breakable stuff removed from the frame, ie. turn signals, side covers, with a good thick piece of carpet you can lay it down and then use couple of long 2x4's to lift it/roll it over with the help of a friend or two.

                      T.C.
                      T. C. Gresham
                      81SH "Godzilla" . . .1179cc super-rat.
                      79SF "The Teacher" . . .basket case!
                      History shows again and again,
                      How nature points out the folly of men!

                      Comment

                      • #12
                        Originally posted by TopCatGr58 View Post
                        It will usually take a good weekend, the prep, the teardown, the dremelling, and then the reassembly. With all of the breakable stuff removed from the frame, ie. turn signals, side covers, with a good thick piece of carpet you can lay it down and then use couple of long 2x4's to lift it/roll it over with the help of a friend or two.

                        T.C.
                        Speaking from experience, if you have extra gears already ground it can be done in about 4 hours.

                        TWICE
                        Greg

                        Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                        ― Albert Einstein

                        80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                        The list changes.

                        Comment

                        • #13
                          HMMM..perhaps ill wait till its broken...
                          81 SH gifted to SON

                          Comment

                          • #14
                            should i used assembly lube on the cams and caps when i re assemble my engine?

                            also wondering if i need to re sync the carbs since ive only removed them and havent needed to open them up again...

                            i lapped the valves so not sure what else needs attention

                            is there a prefered timing spec for my 81 special?


                            cam chain and toolshould be here on wed. gonna start the rebuild prossess....getting pretty excited!!!
                            81 SH gifted to SON

                            Comment

                            • #15
                              Assembly lube never hurts.

                              You should at least check the sync because valve adjustment will affect it.

                              The ignition timing should be fine unless you messed with it.
                              Greg

                              Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                              ― Albert Einstein

                              80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                              The list changes.

                              Comment

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