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Swapped a '78E Mechanical Advance onto my '79F

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  • #1

    Swapped a '78E Mechanical Advance onto my '79F

    Well, I finally got done with everything. Started out installing the Kuryakyn grips. Ras was right, you have to follow the instructions and file-off the ridges on the throttle tube to install it. No glue on the throttle side.

    After that, I replaced front and rear brake light switches. The front one does not work properly, as when I press the button in, the brake light activates. So, not sure if the 650's work backwards of our's, and their's use a normally closed, where-as our's use a normally open circuit.

    Anywho, got the "E" advance, vacuum pot, and the timing wheel on. Took me an hour to get it started, as I think I had the reluctor 180 degrees out (thanks for the tip Scott). Sitting at the "F" mark on idle, and 35 degree with the vacuum line detached at #2 carb, @ 5200 rpm.

    Did not touch the sync or A/F settings. I want to fill it up, and monitor the mileage.

    If anyone is curious what my ignition timing was with the "F" wheel and modified advance, it was 20 degrees at idle, and 35 @ 5200 rpm, with the vacuum pod plugged at both readings.
    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
  • #2
    Sounds like the timing is a bit far advanced at idle but pretty much spot on at 5200. 36 is what the manual says.

    Mine reads a little high at idle too, even down to 500 rpm.
    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

    • #3
      Wait, what? Why would it be too far advanced @ idle? Are you confusing my words Greg? However, after riding it 10 miles, I may hear a slight pinging at low rpms. There is a slight stutter upon taking off. Higher rpm's it does just fine. We'll see if this advance effects my mileage.
      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

      • #4
        Originally posted by IanDMacDonald View Post
        Wait, what? Why would it be too far advanced @ idle? Are you confusing my words Greg? However, after riding it 10 miles, I may hear a slight pinging at low rpms. There is a slight stutter upon taking off. Higher rpm's it does just fine. We'll see if this advance effects my mileage.
        Cam overlap time is a bit different between the two yrs..
        81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

        Comment

        • #5
          Originally posted by motoman
          Cam overlap time is a bit different.
          Originally posted by motoman View Post
          Cam overlap time is a bit different between the two yrs..
          Yamaha cam part numbers are exactly the same 78 and 79 Brant.
          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
            I went to Harbor Freight today and bought a dial indicator so I can find TDC EXACTLY and get the timing marks dead on.

            http://www.harborfreight.com/media/c...mage_13704.jpg
            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

            • #7
              Here's what I did Greg: I used the depth gauge on my calipers and when it stopped raising, I figured that was TDC. My T mark seemed pretty close to that.
              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

              • #8
                I used a screwdriver and found the pointer to be about 5 degrees off. Got the dial indicator just to be sure.

                It was only $35.
                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

                • #9
                  Originally posted by BA80 View Post
                  Yamaha cam part numbers are exactly the same 78 and 79 Brant.
                  Good response for me not looking up specs..
                  81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

                  Comment

                  • #10
                    Quick Question

                    When I sync the carbs, do I detach the vacuum pod vaccum line from the carbs and plug the #2 carb port? When I attached the Carbtune, not much vacuum was showing . . .
                    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

                    • #11
                      Leave the vacuum adv. hooked up. It's not activated at idle.
                      79 F full cruiser, stainless brake lines, spade fuses, Accel coils, modded air box w/larger velocity stacks, 750 FD.
                      79 SF parts bike.

                      Comment

                      • #12
                        Originally posted by BA80 View Post
                        I used a screwdriver and found the pointer to be about 5 degrees off. Got the dial indicator just to be sure.

                        It was only $35.
                        I use the same dial indicator, but I found there is enough backlash in the engine you have to keep rotating it in the 'running" direction.... noting the high reading on the dial over several cycles so you can try to land it exactly on the high point on a revolution.
                        -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

                        • #13
                          Turning the crankshaft there's no backlash.

                          I could have saved $35, I was dead on with the screwdriver method.
                          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

                          • #14
                            I was tempted to go-out and buy that Greg, but I realized that depth gauge would be pretty dang close to a dial indicator (within a few thousandths).
                            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

                            • #15
                              I'll have to raise the idle a tad. She wants to die at stop lights after 20 or more seconds.
                              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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