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About feetupfun

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    1963 to 1981

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    Gladstone Australia
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  1. Hi . Do you have a source for blank nipples ? I think threading my own is the best option . I think that Talon may make 3.5 but at £1.99 each not practical .


    1. feetupfun


      No I haven't looked for blank nipples yet

  2. The 250 is 10kg heavier than the 175 because the 250 motor is 10kg heavier. The 250 feels light for a 93 kg bike which is a normal weight for a standard 250 twinshock. They didn't sell so many Yamahas by accident. They were designed to appeal to Clubman riders and they still do. The 250 is 16 HP and the 175 is 12 HP. They both pull well and in proportion to their capacity. They both have a ridiculously wide useful RPM range. The 250 is a short wheelbase and the 175 is an extremely short wheelbase. All mods are entirely personal preference. Both are very good to ride stone stock. Many people lengthen the 175 to get a light full-sized bike.
  3. https://www.amazon.com.au/3-5mm-Metric-Right-Thread-0-6mm/dp/B07B4C9TH8 I haven't check the pitch of the Bultaco spokes yet but if they are 0.6mm then I'm thinking of getting some of these and some blank nipples
  4. Heat those nipples with a fine flame and they will fall apart. Any remnants of aluminium can be removed from the spokes by soaking the threaded end in a mild acid
  5. For many years I bought replacement aluminium Bultaco nipples from Bultaco parts people but I think that the remaining stocks of them have been used up by now. It seems a waste of the spokes not to reuse them because the stainless steel Bultaco spokes are/were very nice. For my most recent Bultaco restorations, I gave up looking for aluminium nipples and bought new stainless steel spoke kits, which are quite economical nowadays.
  6. Hi . Thanks for all the input on my Alpina project , it’s appreciated . Just got a manual from Bultaco UK ( in motion ) and I’m very impressed with the crankshaft seal arrangement and wondered if the mains could be changed from the outside , using a blind hole bearing puller .

    cheers . Lee 

    1. Show previous comments  4 more
    2. feetupfun


      Yes that's what I'm saying

    3. Lee halsall

      Lee halsall

      Is it possible to drill the hole ?

      the air box was delivered today , part no takes away any doubt , what do the other bits look like ?


    4. feetupfun


      Theres a sheet of mesh or perforated steel plate about 1.5mm thick with a hole for the steel tube. The mesh rests on the flats in the casing, then a flat piece of filter foam, then another piece of mesh to contain the foam, then a washer, a light coil spring and washer that all fits over the steel tube.

      The airbox cover/lid also has a hole and there is a large headed screw that screws into the steel tube. It holds the cover on and compresses the spring. The length of the tube limits how far the screw can compress the spring.

      As for the bearing ventilation, the crank seal holders rest against the bearing outers and the seals themselves are very close to the bearing

  7. 99 is like a square steel funnel with flat filter horizontal at the top. 115/116 has a flat filter in a vertical plane in a fibreglass housing They changed the design to avoid having to remove the tank/seat to service the air filter
  8. No I don't know of a special replacement footpeg mount made to exactly fit your frame. What's wrong with doing weld repairs on the frame anyway? It's not unknown that trials bikes newer than yours have needed weld repairs
  9. Yes repair if you are worried. Only you know your own level of acceptable risk. If it was mine and depending on how much life is left in the rest of the bike I would either fit new peg mounts or let them wear down another few mm. Pre-formed peg mounts are readily available and you could fit them a bit higher than original.
  10. feetupfun

    Alpina 116

    Your idea of a swap sounds sensible. I've bought quite a few trials bike fuel tanks from overseas (UK, USA and France) and I'm not alone in doing that so I guess postage cost is not prohibitive to a motivated person. Your tank would be amongst the best (unrestored, original) of its type I've seen. If your tank was here it would sell quickly for $AU200-$300 (GBP 100-150).
  11. feetupfun


    Shane it would probably be good to put an ad for it on the Trials Australia website
  12. feetupfun

    Alpina 116

    I would love to be able to buy that tank from you or swap for one of my 115/116/137/138 tanks, but there is a law preventing sending second hand tanks from the UK to Australia.
  13. feetupfun

    Alpina 116

    The photo I posted is a 115 and the cylinder looks different to your 116 because it is a 250 and that is how 250 cylinders looked until around 1974. After they changed the 250 cylinder finning design to a more open spacing, the 250 then looked very similar to the 325/350 cylinder. The common name for motor in the photo I posted is round barrel because viewed from above, the fins form a circle. The round barrel 250 has poor heat rejection capabilities because the fins are too closely spaced. Bultaco realised it was a problem and when the 325 came out it was made with wider spaced fins that form a square when viewed from above. The 250 was later changed to a similar finning design to the 325. Other than the motor capacity and the colour of the stripe on the tank, the 115 and 116 are the same.
  14. feetupfun

    Alpina 116

    The 85/99 tank you have is more valuable than a 115/116 tank
  15. feetupfun

    Alpina 116

    This what your Alpina tank shape should be to fit your frame. This is a 115 which is the the 250 version. The 115 and 116 have the same shape tank. The 250 has a silver stripe and the 350 has a yellow stripe
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