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Thread: 1973 Suzuki TM250 replica

  1. #31
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    Quote Originally Posted by husaberg View Post
    on my link was imo the exact sprocket you asked for. its listed as funny enough a TM250 for off road or a ts250 for road.
    pretty sure you measured the PCD wrong.

    http://www.jtsprockets.com/catalogue/model/2440/
    http://www.jtsprockets.com/catalogue/model/1953/
    http://www.jtsprockets.com/catalogue/sprocket/JTR813/

    Attachment 343807


    RE the chain just use a std common size that is freely available now choose the spokets to suit.
    if you cant find a sprocket to suit just thin down the sprocket .

    this is one that has 42t and 520 off the shelf
    http://www.jtsprockets.com/catalogue/model/1946/
    used on these models
    http://www.jtsprockets.com/catalogue/sprocket/JTR820/
    try searching for 45t for these bikes

    Cool thank you for the help, that 520 DR250 rear sprocket would be good and bolt right on. the part# JTR813 sprocket for the TM and TS is long since discontinued but the front sprocket is available off the shelf.

  2. #32
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    The 520 conversion would make live very easy as I could machine the front sprocket from 5/16 to 1/4" and everything else would bolt on

  3. #33
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    I just need tires and a chain now, sprockets are ordered
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  4. #34
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    Got a good used set of tires from the jumbo bin at a local bike shop, mint. Just need a chain now, got the DR250 rear sprocket and a new TS front witch I will deal to tonight.
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  5. #35
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    Quote Originally Posted by rudolph View Post
    Got a good used set of tires from the jumbo bin at a local bike shop, mint. Just need a chain now, got the DR250 rear sprocket and a new TS front witch I will deal to tonight.
    looks sweet, are they 21 and 18 wheels? Front looks small.
    just needs some side covers to kick it off.
    Make sure you anneal the sprocket and retreat afterwards. Unless you are borrowing the lathe and tools.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  6. #36
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    Quote Originally Posted by husaberg View Post
    looks sweet, are they 21 and 18 wheels? Front looks small.
    just needs some side covers to kick it off.
    Make sure you anneal the sprocket and retreat afterwards. Unless you are borrowing the lathe and tools.
    Yes 18 and 21 I was going to get some of those oven number boards unless I can find the TM side covers, I had a go at the front sprocket last night But my lathe is too worn and chatters from the sprocket teeth so I will have to take it to my friends work and he can do it on a better lathe and they have ceramic inserts witch are good for hard steel.

  7. #37
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    not sure who makes them
    http://vintage-suzuki.com/product-ca...de-panel-sets/

    if you heat the sprocket to cherry red. allow to cool slowly it should be soft.
    Then after you have machined it, then re-heat to cherry red an quench in some dirty old black engine oil to re case harden.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  8. #38
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    Quote Originally Posted by rudolph View Post
    Yes 18 and 21 I was going to get some of those oven number boards unless I can find the TM side covers, I had a go at the front sprocket last night But my lathe is too worn and chatters from the sprocket teeth so I will have to take it to my friends work and he can do it on a better lathe and they have ceramic inserts witch are good for hard steel.
    Bolt a grinder to the tool post for the sprocket machining.
    Works better.

  9. #39
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    I am just going to take the sprocket to my friends shop, if I try to re harden it I reckon I will screw it up and the teeth with snap off, they would be tempered just on the teeth.

    its not super hard as I can cut it with a HSS tool but my lathe is like from 1937 or something like that, I dont think I can do anything on the bike for a bit, run out of funds, got an old Yamaha TT600 Tenere to rewire and sort for a guy to.

  10. #40
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    Quote Originally Posted by rudolph View Post
    I am just going to take the sprocket to my friends shop, if I try to re harden it I reckon I will screw it up and the teeth with snap off, they would be tempered just on the teeth.

    its not super hard as I can cut it with a HSS tool but my lathe is like from 1937 or something like that, I dont think I can do anything on the bike for a bit, run out of funds, got an old Yamaha TT600 Tenere to rewire and sort for a guy to.
    nah heat to cherry red and plunge in dirty oil (the oil has to be old crudey suff that where the carbon is) it will not turn out too brittle unless you plunge it into water
    you cant really mess it up unless you melt the sprocket in a forge at 2000 deg c or you dont expect the oil to catch fire panic and kick it over or such like.
    just have something to put over the tin of oil you use to put out the fire and only heat to red. Not until its a melted puddle.
    The bike looks really neat far better than i expected it to look.
    I might have some CR125M side-covers or similar. if i raid the old mans they are kind of the right shape.

    just the heat from grinding or machining the factory hardened sprocket will likely destroy and cut through the factory heat treatment anyway.
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  11. #41
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    Quote Originally Posted by husaberg View Post
    just the heat from grinding or machining the factory hardened sprocket will likely destroy and cut through the factory heat treatment anyway.
    I've done to several sprockets and never had a problem. Fucken 749r was a cunt to get 520 sprockets for.

    They don't get that hot.

  12. #42
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    Quote Originally Posted by Drew View Post
    I've done to several sprockets and never had a problem. Fucken 749r was a cunt to get 520 sprockets for.

    They don't get that hot.
    The hardening is normally only on the surface "ie cut through"
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  13. #43
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    Quote Originally Posted by rudolph View Post
    Yes 18” and 21” I was going to get some of those oven number boards unless I can find the TM side covers, I had a go at the front sprocket last night But my lathe is too worn and chatters from the sprocket teeth so I will have to take it to my friends work and he can do it on a better lathe and they have ceramic inserts witch are good for hard steel.
    The ceramic tips ok for hardened stuff won't like the intermittent cuts on the teeth.

    Follow HBs suggestions below your post
    Or follow Drew's suggestion. This works as well.


  14. #44
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    Quote Originally Posted by husaberg View Post
    nah heat to cherry RED and plunge in dirty oil (the oil has to be old crudey suff that where the carbon is) it will not turn out too brittle unless you plunge it into water
    All fixed now. I'm sure your boyfreind gives your cheery head.
    "Every time you set your ass on a bike, you're playing a game of Russian Roulette between yourself and your own stupidity."

  15. #45
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    Turned the sprocket down today with a ceramic tip no problems, just used a high speed, lots of sparks.

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