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'74 TX650 Build (monoshock)

Discussion in 'The Garage' started by YesX650, May 18, 2019.

  1. YesX650

    YesX650 XS650 Enthusiast

    1974 TX 650, 8400 kms. Block leaking oil. New piston in cylinder 1 (original owner ran lean and blew hole in piston). It was last registered 15 years ago.



    Keep in mind that I bought this frame already cut up. Well... The rear frame loop had been bastardized. If I could have brought her back I would, but then again I always wanted to do this... so break out the beer and grinder!! :devil:

    I will continually update this post with the most recent photo of my bike. From here on in are progress pics. 20190602_131011.jpg

    Attached Files:

    Last edited: Aug 15, 2019
    Jim and TwoManyXS1Bs like this.
  2. YesX650

    YesX650 XS650 Enthusiast

    Who doesn't like the look of a hard tail? Honestly. The lines, the straight backbone down to axle. The simplicity.

    Ok, so who likes riding down a cobble stone street on a bicycle that has no rubber on the back wheel? ...Me neither.

    So I flirted with the idea of a soft tail build. I surveyed the frame and drew up a 3D CAD model of how I would approach that build. It looked good however if anyone does even a lick of research on softails they'll soon discover that it has minimal suspension travel and is a terrible handling the rear end....so scrap that idea.

    Bratty it is!
  3. YesX650

    YesX650 XS650 Enthusiast

    So you can see if I did a brat style chop (as pointed out by the vets) , lowered, with a stock length swingarm, I would surely be getting a wheel up the arse on the first bumper. Scrap that idea!

    Monoshock it is! Haha. Do your homework here. Suspension geometry is no joke. Yes you can almost put any swingarm into anything but the angles and spring rate / travel.ect. are most important.

    I had to widen the frame a solid inch in order to wiggle this swingarm in there. If you want details I can explain.



    Last edited: May 18, 2019
    Mailman, GLJ and TwoManyXS1Bs like this.
  4. YesX650

    YesX650 XS650 Enthusiast

    Solo Seat mount!
    1-1/8" angle cut to shape.
    1/2" grade 8 bolt shoulder cut down to 1-1/2"
    1/8" plate circle cut with hole saw.
    Welded from the under side. First the bolt to the plate circles then to the bolt through the angle...clean..

    20190518_121546.jpg 20190518_121531.jpg
    gggGary, Jim, Mailman and 2 others like this.
  5. YesX650

    YesX650 XS650 Enthusiast

    Rear fender!
    I got a sportster rear fender for $75. It was damaged, plastic broken , body fill....it was perfect.


    It doesn't fit. Shucks..the radius of the fender is not even remotely close to the radius of my new rear tire.

    So I set it to roughly 12:00 - 1:00 over the axle (Alberta law) and cut it!
    Scripto VU, Jim, Mailman and 2 others like this.
  6. YesX650

    YesX650 XS650 Enthusiast

    Dealing with the oil leaks today. PO didn't tighten much when replacing that piston. Basically all seals and gaskets leaked.

    gggGary, Superjet, Jim and 1 other person like this.
  7. Mailman

    Mailman Hardly a Guru Top Contributor

    Hi YesX,
    Enjoying your build. Your welds and gussets look good and well designed. I’m curious about a couple things, what kind of shop are you working in? It looks like some sort of fabrication business, are you by chance a welder?

    Also what are your plans for the wheels? Or have you got that far in the plan yet?

    Anyways, I’m enjoying following along and good luck with your project! :thumbsup:
    gggGary, YesX650 and Jim like this.
  8. YesX650

    YesX650 XS650 Enthusiast

    Thank you for the positive feedback. I understand it's not a restoration and usually these guys would like to see a bike brought back to original condition, but hopefully I can pay respect by not half-assing things.

    Im a metal fabricator (structural steel and plate fitter) and I work in the sign industry. I engineer and fabricate digital billboard structures, free standing pylon signs, and anything cookie cutter. Right down to stickers (vinyl). It's new everyday and I love it.

    As for wheels, I really want to run spokes and white wall tires. I'm a sucker for old school. Let's hope this mismatch monoshock and sportster tank doesn'tlook like a monster.
    gggGary, Jim and Mailman like this.
  9. Mailman

    Mailman Hardly a Guru Top Contributor

    Ha! I thought I recognized the work of a professional welder! I was a professional welder in my early years. You do nice work.
    Spokes and whitewalls will look good!
    gggGary, Jim and YesX650 like this.
  10. YesX650

    YesX650 XS650 Enthusiast

    Thank you!

    I'm really leaning toward a Springer fork set up. Be it I build one or just buy A DNA.

    Back down to earth, I'm trying to decide which battery is the smallest I can run but still keep electric start. I read something about 8 cell antigravity batteries? But I'm not sure what it takes to use them i.e. reg/rec, alternator, ect
    Mailman and Jim like this.
  11. Jim

    Jim Beyond the edge, is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    I like where you're going with this. Watching.:)
    gggGary and YesX650 like this.
  12. Ratranger

    Ratranger XS650 Junkie Top Contributor

    I would go with an earthx etx12a. Unlike the antigravity they have over/under charge protection built in. Works fine with estart, might struggle a bit when its under 45-50* out. It's the battery I'm using on my tracker with EFI, I am running a PMA with a modern sh775 reg/rec. The built in protections on the battery saved me from having to get a new one when the chinese stator failed.

    Shock mount looks good, I'm not the biggest bobber fan but this one is off to a good start.
  13. YesX650

    YesX650 XS650 Enthusiast

    If I do change over to a Lithium battery due to area constriction, can I run a stock charging system or do I need to upgrade everything?
  14. YesX650

    YesX650 XS650 Enthusiast

    Reinstalled the engine today. There isn't much left to do, just details and wiring...ok..there's lots left!!


  15. Mailman

    Mailman Hardly a Guru Top Contributor

    Dang! You’re moving fast ! :)
  16. YesX650

    YesX650 XS650 Enthusiast

    Making my rear fender struts today.

    Drilled out 3/4" plate and then counter sunk so the bolt head sits flush. Also cross drilled a 3/8" hole to recieved the 3/8" solid rod...
    More pics to come!




    Last edited: May 23, 2019
  17. YesX650

    YesX650 XS650 Enthusiast

    Got around to installing the struts. Not too happy but they're ok. The left side of the swingarm kicks out a lot more to accomodate the sprocket so the left strut has more of a lean to it.

    20190525_122253.jpg 20190525_122240(0).jpg 20190525_122232.jpg 20190525_122227.jpg
  18. Jim

    Jim Beyond the edge, is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    I like 'em :D
    Mailman, gggGary and YesX650 like this.
  19. YesX650

    YesX650 XS650 Enthusiast

    Thanks Jim!

    Also, if anyone sees something they believe to be dangerous in design/application, please give me your 2¢.
    Last edited: May 25, 2019
    Jim and gggGary like this.
  20. YesX650

    YesX650 XS650 Enthusiast

    Hey guys, I'm looking for electrical box ideas..I made a cardboard battery mock up while I wait for my Shorai LFX07L2-BS12.
    I'm thinking I have to mount it under my seat buy just can't decide which orientation...it all looks ugly haha.

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