Jump to content


Site Supporter
  • Content count

  • Joined

  • Last visited

About oldaz

  • Rank
    Advanced Member

Previous Fields

  • Bike
    Montesa Cota 247 VUK

Profile Information

  • Location
    Lethbridge, Australia
  • Gender
  1. Montesa Cota 247

    More progress, although it's slow going. Fibreglass repairs completed and first coat of primer-filler on the tank/seat unit. Have to sand it back now and probably a second coat before I get to final paint. The end is finally in sight.
  2. Montesa Cota 247 kickstart spring

    Here's a picture of the nicely re-chromed kickstart now in place and working fine and theoretically that's the last of the mechanical bits. Started on fibreglass repairs to the tank/seat unit, already got the 2k paint for it and first lit of fibreglass applied. Need to get some primer filler for the little ripples/scratches next.
  3. Montesa Cota 247 kickstart spring

    Got a response and pictures from Pete at Inmotion. The first thing I noticed was in one picture it shows the hook end of the spring hooked around the bottom of the kickstart lever and the hook has a slight twist to allow it to fit right in there. The end of my spring wasn't twisted like this and didn't fit right in the notch, so I modified it to fit the same way. That gave another few degrees less tension and although I believe it's still more than needed I can now get the lever on there. My original spring was broken and part of it missing, so I had nothing to go by, now it makes sense. Thanks for all the responses, with the help from all of you, I might get this thing finished.
  4. 1974 Montesa Cota 247

    Mine has +30 thou stamped on the piston, so I guess it's like car engines where oversize usually goes up in 10 thou increments. I think maybe a better option is to see what size piston you can actually get before you bore it out. I used to repair drive shafts by welding and it was often difficult to get them 100% true to centre - in that industry/application the shafts were in slow rotation so being a few thou out didn't matter, but in an engine turning a few 1000 rpm they need to be 100%.
  5. Almost finished rebuilding my VUK and finally got to TRY and install the kickstart return spring I got from Inmotion. Problems are, the hook that goes in the notch in bottom of lever is level with the pin that goes in the case - so the spring has to be "wound up" half a turn (180 degrees) to get it in there - if this is even possible. Second problem is IF I ever get it in there, when I operate the kicker it will load the spring another 180 degrees which seems way too much tension - I don't think the spring would last long this way. Does anyone know the correct method to fit the spring?
  6. BSA C15

    If you really want to build it yourself, do yourself a big favour and check out Michael Waller's video's on youtube before you start.
  7. 1974 Montesa Cota 247

    This type repair has been done since welders were invented, so it's indeed possible. However the cost will be extreme unless you can do it yourself, and in this application it will be difficult to get it 100% true. I've seen cranks on eBay that would cost less and a better result. I'm almost finished a complete rebuild on a basket case Version Ulf Karlssen 247, so appreciate what you've been going through, also appreciate how much it costs to repair/restore these things.
  8. Montesa Cota 247

    The picture is "photo-shopped" from the 247 parts manual, I just took out the part numbers and assembled the kick lever on computer to demonstrate what I was talking about.
  9. Montesa Cota 247

    Thanks, but I'm referring to the external kick-start lever and it's return spring on the 247 engine. The inner part of the spring locates in a hole in the timing cover and as near as I can see, the outer part has a hooked end to locate in a notch in the clamping area of the lever. Problem as I see it, is the spring has to be pre-loaded by half a turn to get into the notch, then it will be loaded a further 180 degrees as the lever travels through it's throw. This puts way more tension on the spring than is needed, so I ask the question "is this arrangement correct"? Or maybe do I have a wrong lever?
  10. Montesa Cota 247

    Now I have another question re the kick start return spring. I've looked at the drawings and the spring from Inmotion and the lever appear to match the drawing in the parts manual. I assume the hooked part of the spring goes into the notch at the base of the lever. To assemble these parts the spring will have approximately half a turn of tension on it with the lever in the home position. That means a full turn of tension at end of lever stroke - is this normal? It seems like a lot of tension, certainly far more than is needed.
  11. Carb setup Cota 349...drinks like a sailor

    If it's got an Amal carb, you can download their "Carburettor tuning guide" which takes you through all the steps needed to get it right.
  12. Montesa Cota 247 Break In Period

    Near enough $250 Australian plus shipping from Spain - last quote I got was 80 euros (about $125 A) shipping from Spain for a small part - makes for an expensive silencer IMHO.
  13. Montesa Cota 247

    The original steel pusher was totally trashed, so made a new brass one with an oil groove across the face to replace it. The 3 leg pusher was really badly scored from the steel to steel contact, so set it up in the lathe and re-cut the contact face - made it slightly convex to help centralise the brass piece and improve lubrication at contact point.
  14. Montesa Cota 247

    Back on the rebuild topic, I've managed to get a bit more done - exhaust system rebuilt, put new guts in expansion box, straightened and knocked the dint's out and heat wrapped the header pipe, then fitted the new silencer - all parts painted with high temperature semi-gloss black - continued with stainless fasteners. Completed the carburettor, fuel line, fuel filter and airbox. Waiting on kick-start lever from chrome plating, so now moving on to tank unit refurbishment - will have to brush up on my fibreglass skills. Checked tightness of fastenings all over and added lubricants.
  15. Montesa Cota 247 Break In Period

    Being in Australia most of our gas is non-additive, not all petrol stations sell ethanol gas, so we don't have a problem and still have a choice of 3 octane levels. The general rule is if the vehicle is over 10 years old, don't use ethanol gas. Son in law did in a collector car and it cost him over $500 to get everything cleaned out and all new rubber though the gas system - took about 6 months to get the thing running right again - then he totalled it. I use 40:1 synthetic 2 stroke oil with 91 octane unleaded, it doesn't eat rubber or fibreglass, but tends to go off if stored too long.