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  1. co.dirtbiker
    Thread

    Are these the wrong Mikuni pilot jets for XJ900?

    So, still messing with the '83 XJ900 carbs. I got them all cleaned up and replaced the seals. Throttle shaft screws were tons of fun, but much...
    Thread by: co.dirtbiker, Nov 24, 2024, 4 replies, in forum: XJ Technical Chat
  2. co.dirtbiker
    Post

    What did you do to your Yamaha today?

    Finished cleaning, replacing all the rubber and incorrect parts, and reassembling the carbs for the XJ900. Still need to align them, check the...
    Post by: co.dirtbiker, Nov 23, 2024 in forum: XJ Technical Chat
  3. co.dirtbiker
    Post

    XJ900 Seca Saga Continues...butterflies and throttle shafts

    I came up with this gizmo to help avoid damage to the body when grinding off the peened ends with a Dremel. Worked great!...
    Post by: co.dirtbiker, Nov 22, 2024 in forum: XJ Technical Chat
  4. co.dirtbiker
    Post

    XJ900 Seca Saga Continues...butterflies and throttle shafts

    I ended up just getting a shaft and butterfly from Len. But that uncovered another issue when we discovered that most of his stock of shafts...
    Post by: co.dirtbiker, Nov 22, 2024 in forum: XJ Technical Chat
  5. co.dirtbiker
    Post

    Handlebar emblem for '81-'83 XJ750 Seca

    Finally got the 750 back in my own garage. Here's the final PETG version with the super thin layers. You can barely see the layer lines. [ATTACH]
    Post by: co.dirtbiker, Nov 22, 2024 in forum: XJ 3D Printing & STL Files
  6. co.dirtbiker
    Post

    Strange Fuel Issue

    If it happens again, try opening the gas cap and see if that resolves it. If the cap has a clogged vent, over time it can create a vacuum in the...
    Post by: co.dirtbiker, Nov 19, 2024 in forum: XJ Technical Chat
  7. co.dirtbiker
    Thread

    Mikuni Carb Throttle Shaft Butterfly Screw Removal Aide

    So, I finally got to experience the joy of trying to remove the throttle shaft screws on the Mikuni BS35s for my '83 XJ900. Fortunately, I have...
    Thread by: co.dirtbiker, Nov 18, 2024, 1 replies, in forum: XJ 3D Printing & STL Files
  8. co.dirtbiker
    Post

    High beam indicator stuck on, headlight flickers

    I've seen that happen before. Usually, a broken filament in the bulb, but it's still close enough to touch and make a connection when undisturbed....
    Post by: co.dirtbiker, Nov 11, 2024 in forum: XJ Technical Chat
  9. co.dirtbiker
    Post

    Annoying kickstand

    Here's what my '83 looks like. [ATTACH]
    Post by: co.dirtbiker, Nov 2, 2024 in forum: XJ Technical Chat
  10. co.dirtbiker
    Post

    Annoying kickstand

    The side stand on a Seca 750 is definitely NOT supposed to go up on its own. Something is wrong. The center stand however should lift up as soon...
    Post by: co.dirtbiker, Oct 31, 2024 in forum: XJ Technical Chat
  11. co.dirtbiker
    Post

    another CL optimist

    Dang. For $400 I'd have snatched that in a heartbeat if I were anywhere near MN. Looks pretty nice.
    Post by: co.dirtbiker, Oct 30, 2024 in forum: Hangout Lounge
  12. co.dirtbiker
    Post

    Help, I think I mixed up my cam caps!

    Looking at my pics, the ones closest to the cam chain are the only ones that don't appear to have a machined bearing surface. So, like you say,...
    Post by: co.dirtbiker, Oct 29, 2024 in forum: XJ Technical Chat
  13. co.dirtbiker
    Post

    Help, I think I mixed up my cam caps!

    Oh, just realized you said 1990...mine is an '83. Not sure what difference that makes. Oh well, at least it's documented if I ever need it myself. ;)
    Post by: co.dirtbiker, Oct 29, 2024 in forum: XJ Technical Chat
  14. co.dirtbiker
    Post

    Help, I think I mixed up my cam caps!

    @chacal interesting that you say the point to the left side. Almost all of mine point to the right except on the cam chain tunnel which both sides...
    Post by: co.dirtbiker, Oct 29, 2024 in forum: XJ Technical Chat
  15. co.dirtbiker
    Post

    Help, I think I mixed up my cam caps!

    I just happened to have the cover off mine, so I took a couple shots for you and did my best to try and identify any markings. Chart below shows...
    Post by: co.dirtbiker, Oct 29, 2024 in forum: XJ Technical Chat
  16. co.dirtbiker
    Thread

    XJ900 Seca Saga Continues...butterflies and throttle shafts

    To catch up for anyone that missed my previous post where I discovered that someone had replaced the #1 carb on my newly acquired '83 XJ900 Seca...
    Thread by: co.dirtbiker, Oct 26, 2024, 5 replies, in forum: XJ Technical Chat
  17. co.dirtbiker
    Post

    XJ900 Helmet/Seat Lock Guts

    After looking closer at the parts diagram, maybe the helmet loop being non-functional on the seat latch is intentional. There is actually a...
    Post by: co.dirtbiker, Oct 23, 2024 in forum: XJ Technical Chat
  18. co.dirtbiker
    Post

    Thinking about buying my first XJ! (83 Seca 750)

    Very nice 750! Even nicer than mine was. I envy your stock exhaust. Looks like it was standard practice to just bend the headlight bracket arms...
    Post by: co.dirtbiker, Oct 22, 2024 in forum: XJ Technical Chat
  19. co.dirtbiker
    Thread

    XJ900 Helmet/Seat Lock Guts

    While I am waiting for other parts from my '83 900, I decided to see if I could figure out why the helmet/seat lock wasn't working. The main...
    Thread by: co.dirtbiker, Oct 19, 2024, 1 replies, in forum: XJ Technical Chat
  20. co.dirtbiker
    Thread

    Handlebar emblem for '81-'83 XJ750 Seca

    Uploaded another one of my 3D models for XJs on Thingiverse. This one is for a replica of the emblem that covers the screws on the handlebar pad....
    Thread by: co.dirtbiker, Oct 15, 2024, 3 replies, in forum: XJ 3D Printing & STL Files
  21. co.dirtbiker
    Post

    Really old tire date codes

    Thanks all. I didn't see anything with a triangle, but then my eyesight isn't so great anymore. One of the articles I read said it should have DOT...
    Post by: co.dirtbiker, Oct 15, 2024 in forum: XJ Technical Chat
  22. co.dirtbiker
    Thread

    Really old tire date codes

    Anybody know how to read the date codes on really old tires? These are the Dunlops on my '83 Seca 900. Obviously, these are a bit past their...
    Thread by: co.dirtbiker, Oct 13, 2024, 4 replies, in forum: XJ Technical Chat
  23. co.dirtbiker
    Post

    1983 XJ900 Seca (or 1980-1983 XJ650 Maxim) Toolkit contents

    Thanks Len. Should have known you'd have and answer in your encyclopedia. :-)
    Post by: co.dirtbiker, Oct 11, 2024 in forum: XJ Technical Chat
  24. co.dirtbiker
    Thread

    1983 XJ900 Seca (or 1980-1983 XJ650 Maxim) Toolkit contents

    My 900 is missing the factory toolkit. I'd like to find a replacement set for the sake of completeness. There are a lot of toolkits on eBay, but...
    Thread by: co.dirtbiker, Oct 8, 2024, 3 replies, in forum: XJ Technical Chat
  25. co.dirtbiker
    Thread

    Custom Garmin Zumo 396 mount for '83 XJ750 Seca

    Last summer I rode my Seca 750 from Colorado to Iowa to see the National Motorcycle Museum before they shut down for good. Fun ride, and the...
    Thread by: co.dirtbiker, Oct 7, 2024, 1 replies, in forum: XJ Modifications
  26. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    Model uploaded to Thingiverse and posted in the 3D printing forum here. https://xjbikes.com/forums/threads/air-box-mounting-bracket-for-xj900.132722/
    Post by: co.dirtbiker, Oct 7, 2024 in forum: XJ Technical Chat
  27. co.dirtbiker
    Thread

    Air box mounting bracket for XJ900

    My recently acquired 1983 XJ900 was missing the bracket that bolts the airbox to the frame. I found some used ones on eBay, but they wanted a...
    Thread by: co.dirtbiker, Oct 7, 2024, 0 replies, in forum: XJ 3D Printing & STL Files
  28. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    Awesome. Thanks! I came pretty close...I guessed 12. :)
    Post by: co.dirtbiker, Oct 7, 2024 in forum: XJ Technical Chat
  29. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    Worked out pretty well. It's a lot thicker than the stock metal one to give more strength, but it seems pretty solid. Only thing is I'm not sure...
    Post by: co.dirtbiker, Oct 6, 2024 in forum: XJ Technical Chat
  30. co.dirtbiker
    Post

    XJ900 Seca luggage rack

    I realize this is a really old thread, but I came across this one that appears to still be available from Renntec in case anyone is looking....
    Post by: co.dirtbiker, Oct 6, 2024 in forum: For Sale, Trade/Swap, Wanted
  31. co.dirtbiker
    Post

    Mismatched carbs on '83 XJ900

    Chacal suggested he may have one. Talking to him to get some details.
    Post by: co.dirtbiker, Oct 6, 2024 in forum: XJ Technical Chat
  32. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    Haven't asked him about the bracket. Am talking to him about my carb though... I modeled up one to 3D print. First draft is printing now. That'll...
    Post by: co.dirtbiker, Oct 6, 2024 in forum: XJ Technical Chat
  33. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    Found a couple on eBay...some in a parts lot which might even have a few more things I need. But unfortunately, not in the US and shipping is...
    Post by: co.dirtbiker, Oct 6, 2024 in forum: XJ Technical Chat
  34. co.dirtbiker
    Post

    Wanted Mikuni BS35 carb(s) for '83 XJ900 Seca

    PM sent
    Post by: co.dirtbiker, Oct 6, 2024 in forum: For Sale, Trade/Swap, Wanted
  35. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    Thanks again @Franz. That made it easier to track down the part #.
    Post by: co.dirtbiker, Oct 6, 2024 in forum: XJ Technical Chat
  36. co.dirtbiker
    Thread

    Wanted Mikuni BS35 carb(s) for '83 XJ900 Seca

    I discovered that the previous owner had damaged the #1 (clutch side) carb and tried to replace it but put in a BS36 instead of a BS35. Obviously,...
    Thread by: co.dirtbiker, Oct 5, 2024, 2 replies, in forum: For Sale, Trade/Swap, Wanted
  37. co.dirtbiker
    Post

    Mismatched carbs on '83 XJ900

    Update: I found a pair of 35mm Mikuni's on ebay for only $35. They look identical except for one thing: There are 4 holes on the airbox side...
    Post by: co.dirtbiker, Oct 5, 2024 in forum: XJ Technical Chat
  38. co.dirtbiker
    Thread

    Mismatched carbs on '83 XJ900

    You may have seen my other thread on some questionable wiring under the seat on my recently acquired XJ900 Seca. That was the easy fix. Yay. This...
    Thread by: co.dirtbiker, Oct 5, 2024, 5 replies, in forum: XJ Technical Chat
  39. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    Well, I got the wiring sorted out. Whoever put it in wrong must have really worked at it. They had it wedged in so tight the tray was completely...
    Post by: co.dirtbiker, Oct 5, 2024 in forum: XJ Technical Chat
  40. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    I honestly never imagined I would own one. They are so scarce around here. Only one I ever saw in person was literally in a museum. I had been...
    Post by: co.dirtbiker, Oct 1, 2024 in forum: XJ Technical Chat
  41. co.dirtbiker
    Post

    COLORADO!!

    One of them at least. Missing the right side. I'm going to try my hand at 3D printing a replacement.
    Post by: co.dirtbiker, Oct 1, 2024 in forum: Western US and Canada
  42. co.dirtbiker
    Post

    COLORADO!!

    Just picked up an'83 XJ900 Seca to keep my '83 XJ750 Seca that I bought 13 years ago company. The last thing I needed was another project, but it...
    Post by: co.dirtbiker, Sep 30, 2024 in forum: Western US and Canada
  43. co.dirtbiker
    Post

    Under seat wiring routing on '83 XJ900

    Oh wow. That looks way different. It looks like somebody mounted the whole thing rotated 90 degrees on mine. Those tabs should be on the side...
    Post by: co.dirtbiker, Sep 30, 2024 in forum: XJ Technical Chat
  44. co.dirtbiker
    Thread

    Under seat wiring routing on '83 XJ900

    Just got a new (to me) '83 XJ900 Seca (US) to keep my '83 XJ750 Seca company. It's in pretty decent shape with less than 24,000 miles and I think...
    Thread by: co.dirtbiker, Sep 30, 2024, 16 replies, in forum: XJ Technical Chat
  45. co.dirtbiker
    Post

    XJ750 Seca no power until around 3000 RPM

    Made it through my little excursion from Denver, CO to the National Motorcycle Museum in Anamosa, IA before they close down. The old girl ran like...
    Post by: co.dirtbiker, Aug 26, 2023 in forum: XJ Technical Chat
  46. co.dirtbiker
    Post

    XJ750 Seca no power until around 3000 RPM

    Close enough. Solved the mystery of #1. Before I started the check, I decided to go ahead and replace the float needle valves with a new set I...
    Post by: co.dirtbiker, Aug 12, 2023 in forum: XJ Technical Chat
  47. co.dirtbiker
    Post

    XJ750 Seca no power until around 3000 RPM

    Ok, working on the fuel level. I managed to get 3 of the 4 drain screws out on this rack and 2 of the 4 on the other rack using a heat gun and a...
    Post by: co.dirtbiker, Aug 12, 2023 in forum: XJ Technical Chat
  48. co.dirtbiker
    Post

    XJ750 Seca no power until around 3000 RPM

    I put it back together enough to take a test ride. Maybe a slight improvement, but mostly the same. Haven't had time to do a fuel level check or...
    Post by: co.dirtbiker, Aug 1, 2023 in forum: XJ Technical Chat
  49. co.dirtbiker
    Post

    XJ750 Seca no power until around 3000 RPM

    I "bench set" them according to the spec (17.5mm from gasket surface as I recall), but the one thing I couldn't get out when cleaning the carbs...
    Post by: co.dirtbiker, Jul 21, 2023 in forum: XJ Technical Chat
  50. co.dirtbiker
    Post

    XJ750 Seca no power until around 3000 RPM

    I may actually have another TCI in a box...somewhere. I have about 2/3 of another bike including a complete engine, frame, tank, seat, some...
    Post by: co.dirtbiker, Jul 19, 2023 in forum: XJ Technical Chat
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