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trailie

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Everything posted by trailie

  1. trailie

    Bultaco M80

    I've two M80 frames, one is stamped G and the other is stamped with a number 3. From my own manufacturing experience I used to think they might have been an inspectors stamp but your idea may well be more plausible Stevem75. http://ralphsbultaco.blogspot.com/
  2. trailie

    Model 80 Restoration

    It looks fantastic, beautiful restoration, well done. Great to see it finished.
  3. trailie

    Bultaco rebuild

    Keep a look out on ebay, I was able to get an original copy for my Model 80. You can view it here http://ralphsbultaco.blogspot.co.uk/2014/04/12-download-parts-list.html
  4. trailie

    What Did You Do To Your Bultaco Today?

    Post a photo of that watch thing, would love to see what it looks like.
  5. trailie

    What Did You Do To Your Bultaco Today?

    Thanks for the comments guys. Yeah I'm quite sure the back box was the first thing most people took off. The alloy mudguards couldn't have lasted long either. I still have the Miller silencer box from the old photos but its split and the insides fell out of it many years ago.
  6. trailie

    What Did You Do To Your Bultaco Today?

    I posted some new pictures of the bike now that its finished, I hope you like them. I might take some more if we get a touch of snow ( link below) http://ralphsbultaco.blogspot.co.uk
  7. trailie

    Crankcase Reassembly ?

    I would have reckoned probably 10-11 Nm (7-8 ft/lbs) would be about right for an M6 thread.
  8. trailie

    Starting The Re-Build, Badly.....

    I took some photos of my re build, although it's a different model it may help. http://ralphsbultaco.blogspot.co.uk/2014/07/26-building-up-crankcases.html
  9. trailie

    What Did You Do To Your Bultaco Today?

    Good job with the tank Manndolins. I've also got mine finished this week although I didn't do the actual painting. I did however cut it in two at one point to get rid of the old petrol sealer so its nice to see it back on the bike. She had to come down some very steep stairs as well this week, so hopefully very soon I'll get a ride on her again. http://ralphsbultaco.blogspot.co.uk
  10. trailie

    What Did You Do To Your Bultaco Today?

    I had thought of cutting the two big slots like you did but the boat repair man reckoned it wouldn't make any difference just cutting the thing in two bits. Yours turned out looking really good Larry. Did you use anything inside it again afterwards. Brian was telling me he has a resin that he uses in chemical tanks that's resistant to acids, but ethanol's not really an acid, so I might go with whatever is currently the best - caswell maybe
  11. trailie

    What Did You Do To Your Bultaco Today?

    Well I finished fabricating the chainguard with a nice dimple and bracket, but I've also took the plunge and cut open my tank. Anyone made similar repairs? http://ralphsbultaco.blogspot.co.uk
  12. trailie

    Mudguard Stays - Help Please

    I want to fit my front mudguard to a model 80 sherpa using the original shaped stays. I don't have any of these but I reckon I could make them easily enough with a little help. If anyone has a bike with these on it (twinshock maybe) could you do me a favour. Could someone screw them off and try to make a drawing or template with a few dimensions on it. It would give me a better idea than just working from a photo. Ralph
  13. trailie

    Mudguard Stays - Help Please

    Larry that's a great bit of work and easy enough to understand, appreciate it. I've never seen a bracket like that one before. If I'm honest I'd still like to make ones similar to the top picture. What thickness is the aluminium in your bracket, I was thinking 2 mm would be ok. http://www.ralphsbultaco.blogspot.co.uk
  14. trailie

    Mudguard Stays - Help Please

    Thank you, that would be great. I'll PM my address
  15. trailie

    What Did You Do To Your Bultaco Today?

    I started making a chainguard today for the M80. Got a sheet of 1.5mm aluminium about 18" square from a mate for free and made a folder from bits that where lying round the shed. Managed to put a nice curve on the top of it. Next it needs cut out and filed up. Maybe tomorrow.
  16. trailie

    Bultaco Re Liner

    Yes indeed Larry, very easy for the spokes to snap when trying to loosen the nipples. But you'll know yourself, lathes with enough swing to accommodate the full wheel aren't as common, so most will find themselves forced into taking it apart for that reason. - A thought just came into my head, I know where there's a railway restoration yard - their bound to have big machinery - that's me sorted out next time. I kinda mentioned the hub distortion thing just because I'd heard it discussed here in another post somewhere and it was in my head while I was writing.
  17. trailie

    Bultaco Re Liner

    Larry, my thoughts initially were to bore out the remains of most of the existing steel liner and make a new new one to suit. I would have made a simple mandrel and mounted the bare hub on this, with just the bearings in it (no rim). I feel that the hub is pretty substantial and won't be pulled out of round by the spokes. (I've built several wheels for people and never had that happen). So a pretty simple set up really. The thing that troubled me most was deciding what fit I was going to choose. It had to be an interference fit but the precise class of fit I couldn't decide upon because I didn't have the experience of just how much the hub might expand if given a good amount of heat, and what I could get away with, if you know what I mean. The last thing I wanted was for the liner to spin inside the hub when I applied the brake. So I just took the lip off the edge of the old liner and went with thicker material on the shoes. When I was doing this on the lathe the hub was spinning really true inside, so I don't think you need to necessarily keep it in the rim for accuracy. Posted a couple of pictures of my setup on this link http://www.ralphsbultaco.blogspot.co.uk
  18. trailie

    Bultaco Re Liner

    I should have done that - that would have been perfection
  19. trailie

    Bultaco Re Liner

    I thought on doing this myself then took the other approach - putting thicker linings on the brake shoes and skimming these down to suit the hub. Worked out quite well and only cost £20 for the reline, left about half a mil clearance between the two so it should give me a good brake . I take it, it's the wheel hub we're talking about? http://www.ralphsbultaco.blogspot.co.uk
  20. trailie

    Old Bultaco

    I was looking at your markings on the frame, I rubbed my frame down today and discovered a G and a P. One on the side of the headstock one on the top frame tube. It made me think these might be identity marks from the individual welders or factory inspectors. I know we worked a similar method in Shorts. I would have stamped any jigs I worked on with a T242, that was unique to me. The little square marks are a bit more peculiar. You say there is another set directly opposite. Almost seems like witness marks left by the jaws of a vice, although they look a bit too deep for that. Strange. Ralph http://www.ralphsbultaco.blogspot.co.uk
  21. trailie

    Bead Blasting

    No I haven't, but would the process of Soda Blasting work for this do you think. It would not be abrasive. http://www.ralphsbultaco.blogspot.co.uk
  22. trailie

    Old Bultaco

    Don't discount making the broken gear if you fail to source one. If you've still got the old one you'll find an engineer somewhere who can remanufacture it. No idea what this would cost mind you, unfortunately we don't have the facilities in our place. I once got a worn out mainshaft hard chromed and ground for not very much. This was way before the days of internet and ebay and I didn't know anywhere that I could get another one, so repair was my only option. http://www.ralphsbultaco.blogspot.co.uk
  23. trailie

    Bultaco Stickers Model 80 1971

    I'm coming close to painting the bike and I wondered if anyone knew what stickers where on the bike from new. There weren't any on it that I can remember, but the book shows a various selection. Were these perhaps available to buy if you wanted to add them yourself ? I've hunted for old photos from back in the day but am not any the wiser. Does anyone remember. http://www.ralphsbultaco.blogspot.co.uk
  24. trailie

    Bultaco Stickers Model 80 1971

    That's a lovely wee bike your riding Woody, and I remember our M80 looking a bit "tired" like the one you had. When I was over in Barcelona this year I had hoped to find out a bit more about the bike but they don't have an M80 in the moto museum and the lady on the desk doesn't know much, although she's very nice about it, and the books they have are all in spanish. I called out at the Romero shop. The're a really nice family but on the day I was there he had to go to the hospital, so him and his wife didn't stay long. In fairness he's not really into the trials bikes. He worked in the race department so it's all TSS stuff he's into. His wife worked in the export office and she showed me photograph albums of old pictures from inside the factory and of different people working there. That would have been good if I'd more time to sit and look at them. I will say anytime I asked Peter what was the correct part he pointed to that cover picture from the owners manual. So it's the best thing I have to work from at the minute unless someone knows different ?? Ralph
  25. trailie

    Bultaco Stickers Model 80 1971

    This is a great history lesson Woody, you need to write a book sometime. I've got loads more to ask but it'll keep for another time. Thought I'd share a couple of the old photos I'd dug out. Me and my dad about 1977. Like most wee boys I'm more interested in building ramps and doing jumps. Notice nobody gave a toss about putting kids on motorbikes without a crash hat in those days, but back then we'd the sense not to hurt ourselves.
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