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1979 XS1100 Not a XJ900 but it will do for now

Discussion in 'Other Motorcycles' started by Timbox, May 1, 2019.

  1. JetmechMarty

    JetmechMarty Active Member

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    [​IMG]
    Torozzi rearsets for XS1100 Sport should fit the Special. I have yet to try it. FastFromthePast.com is the Torozzi source. They also have a fork brace and fork tubes. That machine can get an easy makeover without cutting anything up.
     
    Timbox likes this.
  2. Timbox

    Timbox Well-Known Member

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    Now that the BMW is off getting worked on, I got time to work on the XS! I turned the petcocks on to prime them and #3 started to leak. I need to order a rebuild kit for the needle valve, the one that shuts off the fuel when the floats rear their level. I know I am running a too low of main jet with the UNI filter and the 4-1 Kerker pipe. I can't remember how many I need to go up with the main. The stock is 137.5. I am guessing +3 with both the air and exhaust mods? Making it a 140.5

    Okay, 4 rebuild kids with 140's on the way. Hope this does it. I will have to change out the seat and also the bars. Coming along with that will have to be the brake lines, if I change out the bars I am sure the stock stuff will no longer fit correctly.
     
    Last edited: Jun 29, 2019
  3. Timbox

    Timbox Well-Known Member

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    Pulled the carbs today, I don't mind pulling them on this bike, lots of room when the air box is pulled back. The needles jets seem to be okay, but no way are the old ones going back in. Once the new kit gets here new main 140's and the new needle jets go in.

    The plug boots had tape on them, pulled the tape off and found out why. The #4 was broken so bad that the tape was holding it together. The #1 was close to the same, 2-3 were good. So new boots and I would guess some new plugs are in order too.

    Painted the header too, will see how that stays on with heat. Need to do more painting of the rear hub too.
     
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    What paint did you use?
    Did you scuff up what little chrome was left on them?
     
  5. Timbox

    Timbox Well-Known Member

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    k-moe, you are right to ask me about the paint, I suck at it....lol. I used an exhaust paint from the auto store just for exhaust. I went with a ceramic mixed paint. I did sand them down and clan them off the bike. Once I got them on the bike, they didn't look good in the aluminum color, so I hit them with semi-gloss black hi temp after that. We will see how long that lasts. The pipes were well rusted to the point of little pitting. They are in over all good shape.
     
  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    As long as you did some prep work the paint will hold up for several years. It might even be there arfter the pipes have rusted away.

    Based on your concerns, I was concerned that you might have used ordinary enamel.
     
  7. Timbox

    Timbox Well-Known Member

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    It has always been a issue with me, painting that is. I would love to sand down this tank and get rid of all the little blems in the tank and some of the surface rust that will eventually turn into a issue. I just think when I try to paint it is either too humid or it is just me. I never seem to get the paint the way I want it and it seems to come out foggy looking.

    I have not tried that clear coat that holds up against gas yet, that could be the ticket. That and making sure I wait long enough to let the paint dry. I do think this tank needs to be done and the BMW I am working on should be done too.
     
  8. Timbox

    Timbox Well-Known Member

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    Got me stampeded! I put the 140 mains in and also re-ran the fuel lines so I know they are not hindering the fuel low. I start the bike, runs great, comes off of choke in a very short time and runs well. Then take it on the road and give it a twist and it is almost like there is a governor on it at 5k! As stated above, I took the carbs to church, normally it would be a low rmp issue or idle issue, not the case.

    Are my secondary jets not even kicking in? If so why not? The new larger jets, the very clean emulsion tubes, just a head scratch-er for me. Hit he pips with a IR temp guage and all the exhause pipes were very close. Nothing cool so all are firing and running.

    It just dawned on me, ignition advance? I think these bikes had issues with one of the wires breaking or cracking...I am guessing that would make it top out in the RMP range?

    Any advice would be great...anyone think it might be the advancer?
     
  9. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    That fits. I once had a problem with my old truck that I thought was a plugged-up fuel filter (that problem had occured several years before, so naturally I went straight back there). She would bog down at 3,000 RPM (smallblock V8). Turned out to be a hidden crack in the vacuum line to the advance diaphram.
     
  10. Timbox

    Timbox Well-Known Member

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    I think it is the vacuum advance but now to play around to what port to run the vacuum to? I currently have it hooked to #2 carb as I think that it how it was from factory. I removed the Oct fuel thing and have plugged that vacuum port, I think I will try to change the advance over to that nipple and see if it works better.
    [​IMG]DSCN0323 by Tim Brown, on Flickr
    [​IMG]DSCN0329 by Tim Brown, on Flickr
     
    Last edited: Jul 8, 2019
  11. FJ111200

    FJ111200 Active Member

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    That's right mate. The take-off spigot on number 2 carb, NOT the carb to head manifold.
    If you have it connected to the carb to head manifold the vac advance will just rattle and jump around like a good 'un.
     
  12. Chitwood

    Chitwood Well-Known Member

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    May not hurt to make sure the mechanism itself moves freely and isnt sticky causing inconsistent timing. Making sure the line is hooked to the proper location would definitely be my first go to though also
     
  13. Timbox

    Timbox Well-Known Member

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    Thanks for the response, I made sure the hose was good and watched the timing advance with vacuum applied. I cleaned the timing wheel and lubricated it with PB blaster on a "Q" tip, I didn't want to over do it.

    I am stepping away to try to think this through. Can't be anything else has to be the timing issue. Working on another bike for a while so I can come back to this and maybe have a fresh set of eyes to make it work. I sure love the power this bike has when you roll on the throttle, just wish it didn't stop at 5KRPM.
     

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