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About woody

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    Birmingham UK

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  1. The gearbox from an M85 Alpina should go straight in but later models will have differences in shaft diameter and clutch hub mounting so aren't a straight swap Much easier to just change the sprockets than gearbox ratios. Standard Sherpa size for that year is 11 / 46 for a 520 chain or 13 / 52 for a 428 chain, just fit bigger front, smaller rear
  2. woody

    Ossa twinshock

    34 is a MK1 Ossa MAR 1972/73 250cc. The frames weren't stamped with a number on the MK1 they had a sticker on the headstock. The frame has been repainted as they were siver/grey originally
  3. Autotek is acrylic paint and may not be resistant to petrol - most modern paints don't seem to be. If you spill any whilst filling the tank you could end up with an unsightly blemish if it isn't. Paint something else that doesn't matter and when cured pour / rub some petrol on it, better to find out that way than ruin you tank paint job. Halfords paint for example is acrylic and although gives a really nice finish from a can, when it comes into contact with petrol it virtually dissolves
  4. hi woody,do you know the thickness of the original ossa mar central case gasket....my old one mic'ed at 0.025 inch on average ....and a new  vintco gasket mic;ed at 0.030  inch...im trying  to avoid shimming changes due to a thicker gasket

  5. woody

    Sherpa T 350 191

    The 199 exhaust has a higher rise over the head than the 191 pipe so it will sit a lot closer to the underside of the tank. It also bolts directly to the cylinder so you'd need to remove the manifold from the 191 cylinder. You might also find the outlet doesn't match the inlet of the rear silencer in respect of tube diameters but if so that can be sorted by welding the correct size tube to either one. You're not really going to know the answer to your question completely without trying it For interchanging parts it's difficult to give a precise answer as there are differences. Not many engine parts are directly compatible, head and barrel can be changed together but not individually as 199 uses a head gasket, 191 doesn't. Gearbox internals are different, crank probably looks the same but the 191 has a single bearing on the clutch side, the 199 might be a double, can't remember. Forks and wheels are the same
  6. woody

    OSSA MAR oil leak

    They shouldn't leak. I've found using talc helps pinpoint where it first comes from, dry it all off, shower it in talc and then you can see where the wet patch first appears What can happen with the MAR is that the bashplate gets bent upwards in the middle from repeated contact with the scenery and this can expose the sump plug. If the plug then starts taking hits it can crack the casing around the plug but yours looks fine. It could possibly cause distortion which stops the cases mating fully, not sure Some of the gaskets these days are horribly thin and if there is any imperfection in the mating surfaces oil finds a way past and drips Yours has grey sealer as well as a gasket., possibly 3 bond as that is grey but that would usually fill any imperfection in the mating surface I'd have thought as it's good stuff The gear shaft has an O ring either end but from the ignition side it can't be replaced without splitting the engine as the shaft can't be removed without splitting. It might be possible with the end of the gear shaft cut off flush with the casing to expose the O ring if the shaft is pushed fully inwards with the clutch cover off I've found with these older engines that it's best to put a little oil in before fitting back into the bike and leaving for a day or two to see if there are any leaks. A short term fix is dry it all off once you've pinpointed the leak and apply some plastic padding leak fix along the gasket which should hold it. The only correct fix is a strip and inspection of the mating surfaces which might need facing off or to see if there is a hairline crack anywhere First though, see if you can tighten the crankcase screws any further - you never know...
  7. If you leave it as it is it can't the bolt should still secure it as it is also held with the straps below the seat - but to repair it I'd fill with fibreglass resin and make solid again, then re-drill the holes
  8. As mentioned the tank cover holds it on, bolted at the front and straps at the rear below the seat
  9. I think wherever you buy the points from they are going to be the same pattern points you have already got. Ideally you need to try and find a set of original Femsa if they are still available but no idea where you would get some from. All of the parts stockists I know of, Spain included, sell the pattern points. The issue I had with them is the position of the terminal screw for the wiring which sits directly in front of the coil and makes it extremely difficult to connect the wires - enough so that I bought electronic for my bikes. Add to that I absolutely hate the fiddle of trying to work through a stupidly tiny hole in a flywheel...
  10. It's a cover from an earlier 349, the MK3 white model '81, not an '84, the last MK4 349 from 82-84 had a plastic tank, also with flat sides, no molding behind where the round Montesa badge fits. But yes, someone has just cut it to slip over the bolt
  11. You can only use road legal enduro tyres on the road - they are marked with the E mark in a circle. If they don't have that they aren't legal for road use. You won't need an MOT to register it on a 74 plate, nor insurance.
  12. The DVLA inspection for registration, if they ask for one as they don't in every case, doesn't look for things like that, it's really to ensure you're actually registering what you say you are, chassis number check etc. and not to check RTA conformities. I don't know if the law from 1973 is still in force and I think it was to actually prevent new machines being sold with glass tanks, as there were still bikes being used on the road back then with glass tanks. There are plenty of bikes in use now with glass tanks
  13. The thread on the spindle is a smaller diameter than the spindle shaft. If you remove the nut and washer and just eave the chain adjuster on, you will see that the spindle shaft extends past the adjuster. You need a washer that is the correct ID to slip over the shaft itself not just the threads and the washer also needs to be thick enough that none of the shaft is exposed. If it isn't set up like this the nut will reach the end of the thread and tightens against the spindle shaft itself, not the swingarm From your parts list it looks as though you have the thick washer on the wrong side
  14. woody

    M10 Restoration

    There isn't an actual paint code that Bultaco used. I've seen RAL 9006 recommended. Or the old Ford late 1960s colour of Silver Fox is a good match
  15. ok, understand what you mean now, I wondered if you meant a different shape. I don't know for definite but I think the deeper, more pronounced lettering came with the A models on the Sherpas. Your first picture looks like a 198/199 case
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