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  1. I used viton rings in my 348 tank cap. It becomes a very tight fit almost too tight to get out. Luckily I was able to machine the grooves a little bit deeper to loosen it off.
  2. When I did my apprenticeship we had a plating department. You could see the people that worked there, they all had shiny bits on their cars and bikes It wouldn't be beyond the ability or a previous owner to have his say two year old getting slightly tatty frame dipped, striped and given a flash chrome. The fact it has all fallen off is a sign it probably was done for a bit of fun and not to proper standard
  3. There is some issue with fumes leaking through the fibreglass. I resprayed the tank on my 348 and the paint began to bubble once filled with petrol. There are suggestions are that modern bio fuels can soften fibreglass, in USA lots of petrol powered boats have GRP petrol tanks and its become a thing for them too. They are rare but the alloy tank is easier to look after. if buying unseen bear in mind some alloy tanks are not a good fit in some covers . I had a few and it took some swapping to find a pair that were a good fit. Plastic fuel tanks are quite different, tested approved and not so likely to crack as 40 year old fibreglass. I had a Buell the plastic fuel cell on that has a decorative cover .I have a 'modern' triumph with a plastic petrol tank. These are reportedly changing shape with modern petrol, Mine has become a tight fit in the frame but again its 23 years old.
  4. its easier for you to google Montesa cota wiring diagram than to add one here. they are readily available.
  5. Useful to check where the petrol feed is. I fitted a mikini, the pipe was on the wrong side. And too high up .There's not a lot of space I had troubles getting the petrol into the bowl
  6. On mine the engine number is just a hand stamped number the same as the frame number but without the letters. I have two spare cases and they are roughly hand stamped too. the number is near to the front frame lug
  7. How do they do this at the factory? My Montesa is all cable but I have a Triumph Speed triple and that has all the same problems you are having here. I fixed the SP3 the same way as you describe here. Got to be an easier way.
  8. The 7 mm allen key you need for the head studs is easier to get these days. It certainly isnt in any standard key set but lots of german cars use them in the brakes.
  9. I have three Montesas, Two are project mopeds. I have a Cota 50 that is mostly complete but in need of total restoration I also have a Fura 50 that was partially restored but needs some engine bits. Where do you think is the best place to find buyers for them? I do most of my part finding on eBay but I am concerned I might not find the most enthusiastic buyers there. As they are fairly complete parting out seems a shame and I know I will then still end up with all the useless bits. Really I need the space more than the money but they do stand me some cash which I would like to get back.
  10. My 348 has a similar thing going on. I think the factory fitted something to the tank that was glued on. it must have fallen off in the 80s. A previous owner bolted a bit of bent and hammered steel sheet to the frame that acted as a heat deflector. it didnt look very neat but seems to have worked. sorry no photos as the bike is in bits at the moment.
  11. I'd go with the karting suggestion. They used to cut away so much metal. The big name was Upton.
  12. I second that idea. I like simply bearings, easy website to use and they are really nice people if you ever need to ring them. If you prefer talking to someone https://www.hendersonbearings.co.uk/ have been around a long time and can often match the big websites prices.
  13. https://www.ebay.co.uk/itm/133146626685?ul_noapp=true August 2019 50cc cota forks. Not mine. might be useful to post this here.
  14. I think he means Inmotion in staines. https://www.inmotiontrials.com/
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