Not exactly keeping strictly out of the pub, Vincent Spong combo

Discussion in 'Some Assembly Required' started by Wildebeest90210, Jul 4, 2020.

  1. Wildebeest90210

    Wildebeest90210 Long timer Supporter

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    Now I find myself needing another yellow and black bike, I have #1 so now I need #2.

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    Full credit to Geoff Nickless for this shot from his Instagram , he's releasing 40 years of his pictures featuring multi discipline bike sports and a lot of King Kenny.

    I picked up a 1977 TZ250D frame a while back for what I thought was a good price, nearly sold it but now the die is cast. It looks OK, a fairly well repaired crack on a front engine mount, some bracing on the down tubes and I think the seat has been extended with tube and split pins. They were I believe one size fits all, as long as you were Japanese.

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    A friend of mine had been collecting engine parts for a air cooled frame with YPVS power, just so happened he changed his mind and offered it to me at cost. I can't see any major problems with wedging it in the TZ frame.


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    KR did race a TZ250, a lowboy version HERE


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    Mine should look like this, but it won't.....


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    #1
  2. Lewilewi

    Lewilewi Ride it like you stole it......

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    I think you need 3
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  3. villageidiot

    villageidiot Long timer Supporter

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    but 3 was Gene Romero, not KR
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  4. Wildebeest90210

    Wildebeest90210 Long timer Supporter

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    Aluminum porn for Sunday morn.
    These are some pics of the batch of TZ swing arms being made by a UK company called Metmachex. I was going to get Co-Built Geoff to do me one in 4130 but Metmachex finally got back to me about two months after leaving a voicemail. One has my name on it, could be 4-6 weeks though.


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  5. AK650

    AK650 Long timer Supporter

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    I scored a Metmachex swing arm off eBay years ago for a Sportster( and I didn't even have a Sportster at the time! ). Some of the most impressive TIG welding I have ever seen. Flawless.
    #5
  6. Wildebeest90210

    Wildebeest90210 Long timer Supporter

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    Also in the Al porn category, Maxton are building a shock for me. Finding out they do these pushed me in to building, they have a new(ish) race series called GP originals which has got swarms of TZ's back on the track so Maxton started making this shock.
    HERE
    That spring may need repainting though.............


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    #6
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  7. Wildebeest90210

    Wildebeest90210 Long timer Supporter

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    Win some, lose some ...........

    Win, Hotrods crank in the post. 0.02mm out over the length, cock on everywhere else.

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    So far so good, investigate the clutch rubbers........
    I've never known them right, I think they fitted them wrong in the factory.!!

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    :doh:doh:doh:doh:doh:doh:doh

    Guess I'll be ordering a billet basket then, don't ask how that occured....:baldy


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    #7
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  8. villageidiot

    villageidiot Long timer Supporter

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    You wanted the billet basket anyways
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  9. Wildebeest90210

    Wildebeest90210 Long timer Supporter

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    It was certainly not on my list....I did manage to find a Mitaka on Fleabay to purchase.
    Looked at Yambits later on for other stuff and found the same basket £20 cheaper..... :nah
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  10. Kai Ju

    Kai Ju Long timer Supporter

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    Re the damper rubbers, are there replacements, and do you rivet or bolt the clutch basket back together ? If it hadn't broken...(we would all like to know how that may have happened so we can avoid the same type of random failure...yeah right)

    One more thing, that is the nicest truing stand I've ever seen, and that Mitutoyo digital gauge ain't shabby either.
    #10
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  11. Wildebeest90210

    Wildebeest90210 Long timer Supporter

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    Here is the last time I did it, successfully. New rubbers do fit snugly, Wiseco make them. The billet basket screws together but the original can be re-riveted.
    The Mitutoyo gear I now have access to having been involved in the ordering process......:D Do need another digi gauge for it though....


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    #11
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  12. Wildebeest90210

    Wildebeest90210 Long timer Supporter

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    Some powervalve problems too.
    The coupling is well worn and the end of the valves not too good either...
    One of the bushes is damaged as well.
    All still replaceable at a price :(:

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  13. Kai Ju

    Kai Ju Long timer Supporter

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    Build up with weld and re-machine ? Then hard anodize.
    I had no idea that they wore that much. I guess something to be said for a simple piston port with reed valves...
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  14. villageidiot

    villageidiot Long timer Supporter

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    Nothin revs like a piston port bike.
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  15. Fast Idle

    Fast Idle Since the Sixties Supporter

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    That's too bad, there's another hidden expense. Murphy's law I guess, happens to me all the time.:photog
    Power valves require regular maintenance and quality oil since they live in such a crappy environment but those also look abused too like someone beat on them.
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  16. Fast Idle

    Fast Idle Since the Sixties Supporter

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    What are you doing here AK650? I thought you were still mad at these guys. :lol3
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  17. Kai Ju

    Kai Ju Long timer Supporter

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    This thread is way too entertaining to stay away from, no matter how mad one might be.
    #17
  18. villageidiot

    villageidiot Long timer Supporter

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    hypothetically speaking, can you cap the power valves, and plug the passage so its then just a port reed motor with no power valve?

    EDIT: looks pseudo popular with banshee dudes.
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  19. AK650

    AK650 Long timer Supporter

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    Having a short attention span, and a bad memory helps!
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  20. Wildebeest90210

    Wildebeest90210 Long timer Supporter

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    Many years ago both me and a friend both had YPVS bikes, my servo packed up so I just kept the valve full open. We did some rolling tests from low rpm and there really wasn't a great deal of difference, I kept it like that until I sold it. Back then though throttle was wide most of the time.
    I'll keep them working mainly to derive great satisfaction from the servo whirring back and forward when the ignition comes on.
    #20
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