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Tx750 madness.

Discussion in 'The Garage' started by ShaggyMech, Mar 30, 2021.

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  1. ShaggyMech

    ShaggyMech Socal Mechanic.

    AHA! You actually have the Argo made clutch! I have been looking for that specific sprag for a few months. Can you take measurements of Argo's sprag for me? The I.D. O.D. and the width of the piece? I believe I found a drop on modern sprag but i need to confirm sizes before I order.
     
    gggGary, arcticXS and Rasputin like this.
  2. Rasputin

    Rasputin XS650 Addict XS650.com Supporter Top Contributor

    The outer ring of the sprag clutch is 94mm.
     
    ShaggyMech likes this.
  3. ShaggyMech

    ShaggyMech Socal Mechanic.

    Thank you! The suzuki sprag that i found is 42mm x 94mm. I believe it should literally drop on besides having to drill and tap the mounting holes. Excellent. I am going to make a catalog of parts and corrections for the TX750 so any other that wants to bring one back reliably can do so.
     
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  4. motormike

    motormike XS650 Junkie XS650.com Supporter Top Contributor

    785
    2,135
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    Mpls
    I've had the joy of pulling the engine in and out of one of these.... a few times.... . We had a 73' with a locked up engine..... for the usual reasons.... I scored a low mileage 74' engine. Installed it.... and off the we went.. only to discovered he ran it low on oil.... rings went south.... so we pulled then engine..quick hone.. new rings.... stuffed it back in.. thankfully we have one of those old nursing home " people " lifters.. hand crank... In regards to the header cross over piece... that heavy finned part that bolts to the head.... it's hollow and exhaust remains with the undesirable heat.. read somewhere to solve the issue.. weld the openings internally closed... so I visited my weld'n guru.... We got it all sorted out and for a hefty bike it really haul'd azz .... handled well also. New owner in Colorado reports he's very pleased to have it in his stable.
     
    gggGary, Mailman and arcticXS like this.
  5. ThatXS650Guy

    ThatXS650Guy More Sparky than Speed Racer XS650.com Supporter Top Contributor

    773
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    It is a good looking bike. From a proportions perspective it's winner for sure.
     
  6. jetmechmarty

    jetmechmarty What should I put here? XS650.com Supporter Top Contributor

    When I was 13-14 years old, a poster of that bike was hanging on my BR wall. A large dealer brochure is what it was. I loved the 1973 Yamaha color schemes, particularly the TX750.
     
  7. arcticXS

    arcticXS XS650 Guru Top Contributor

    Judging by the bore and stroke, they used a few things learned from the 650 (same stroke)
    I wonder if the design changes to the cylinder head was partially to make it look more like the CB750 ( Which was not an aesthetic improvement IMHO, but maybe reduced chances of oil leaks)
    Mounting the ignition on the balanced shaft was not the best idea either, at least not from a exact timing and maintenance perspective.
    But I totally agree on it being a good looking bike as a whole !
     
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  8. Rasputin

    Rasputin XS650 Addict XS650.com Supporter Top Contributor

    The ignition is mounted on the opposite end of the oil pump shaft.
     
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  9. Rasputin

    Rasputin XS650 Addict XS650.com Supporter Top Contributor

    Right photo.
     

    Attached Files:

    Last edited: Apr 2, 2021
    Mailman likes this.
  10. arcticXS

    arcticXS XS650 Guru Top Contributor

    Ok, I knew that it was behind the crankshaft, so just assumed it was the balancer shaft. So there is a dedicated shaft just for oil pumps and ignition? With a separate chain drive, or the same chain as the balancer shaft? I have never seen a TX 750 engine disassembled, so bear with me......
     
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  11. Rasputin

    Rasputin XS650 Addict XS650.com Supporter Top Contributor

    No problem.
    The balancer chain drives contra rotating balance shafts from the centre of the crank.
     

    Attached Files:

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  12. Rasputin

    Rasputin XS650 Addict XS650.com Supporter Top Contributor

    Can you divulge the info of the Suzuki sprag clutch you intend to use. Thanks.
     
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  13. ShaggyMech

    ShaggyMech Socal Mechanic.

    Suzuki LT-F250 Quadrunner 1988-2000 Starter Clutch One Way Bearing Sprag

    Also used on arctic cat units. You can get them about 30$ us.
     
    Paul Sutton, gggGary and jonesey like this.
  14. ShaggyMech

    ShaggyMech Socal Mechanic.

    I have a NOS starter chain, and I will be making a tensioner for that. I'm still looking for a new balancer chain.
     
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  15. Rasputin

    Rasputin XS650 Addict XS650.com Supporter Top Contributor

    Good luck with the balancer chain. It’s very special, same as the starter chain only 2 links longer.
    I had to pay €190 for the last one from cmsnl.
    Starter chains are cheaper, I thought about buying two and extending one chain with two links from the other.
     
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  16. 5twins

    5twins XS650 Guru Top Contributor

    20,889
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    813
    I would hazard a guess that these chains are nothing more than cam chains of some sort. Can't you get the size numbers off the side plates of the originals and possibly track down a replacement cam chain? Too long is OK, just shorten it and put a rivet type master link in it.
     
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  17. 5twins

    5twins XS650 Guru Top Contributor

    20,889
    13,600
    813
    gggGary and Rasputin like this.
  18. ShaggyMech

    ShaggyMech Socal Mechanic.

    Oh I have studied that web page for many tips tricks and hints. I have An engine case waiting to get all needle bearings, and many other mods.
     
    gggGary likes this.
  19. ShaggyMech

    ShaggyMech Socal Mechanic.

    20210404_202357.jpg
    Changed the tank and replaced points, greased advancer, cleaned up the overall look. Runs very good. Still looking for the banging inside the case.
     
    Rasputin, gggGary, jonesey and 6 others like this.
  20. ShaggyMech

    ShaggyMech Socal Mechanic.

    Finally it runs on the second kick. Petcocks on the new tank were horrible. Cleaned now it runs great.
     

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