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helm

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Posts posted by helm
 
 

  3. Early Mkl

    in Montesa

    Posted

    Hi all

    1 woody thanks for that site

    although I don't need to date the engine (a no lower than 30) ie 1967/68

    You should check out prototypes. And scroll down to Impala trial 1966

    And the tank on the 69 supersport imediatly below

    2 king scorpian engine number as above

    the frame is stamped on the right side of the headstock COTA 247

    There is no sign of any abrasion to frame in that area or any where else

    it has a thin coat of black paint,I can find no trace of any other colour

    3 sparks 2

    thank you for the information on villiers engined bultaco perhaps it should have a separate posting?

    also any photos ?

    cheers helm

  4. Early Mkl

    in Montesa

    Posted

    Hi cleanorbust and woody

    think the tank was made for the frame,

    has a cut out in the bottom to fit close around

    the exhaust ,

    and fits exactly front and back

    Also it does not look to have been altered in anyway

    What about the seat unit?

    this also is very well made

    out of a single piece of alloy

    Cheers helm

  5. Early Mkl

    in Montesa

    Posted

    Hi

    thanks to both ,sold

    the question is does any one recognise the tank/seat in alloy

    the tank is similar to the trial 250 but no breather and the

    shape at the back is not the same the seat

    To big shine bike. Do not understand your comments

    Why will it need a strip down?and why do you think I want to make money on it?

    Cheers

  6. Early Mkl

    in Montesa

    Posted · Edited by helm

    Hi

    any ideas

    Early mk1 with alloy tank and separate alloy seat unit

    tank is shaped for a snug fit over the exhaust.

    Later alloy top yoke

    Replacement sm plastic mudguards ignore these

    cheers helmpost-7477-0-51700900-1436911987_thumb.jpg

  7. Montesa Cota 247 Specs Need Help!

    in Classic Trials

    Posted

    Hi

    been running my 247 on a almost daily basis (both sons use it as well) with castrol at 50 to 1 (20cc/ml to 1 litre) for last 10 years without any problems.

    Having striped the bike for a redo , seeing the amount of tar like residue in the font pipe , I think I'll try 60 to 1 and see how it goes

    does the ethanol enriched petrol increase the build up?

    Cheers helm

  9. 1980 Cota 349 Wheelbase

    in Montesa

    Posted

    hi

    have both a 348 and a first model 349(red tank)which is 1979

    the forks on the 349 are longer Iuse the 348 forks in it and it is mutch better

    I have seen fotos in the bernie book of vesty on the 349 in 1979 and he has the forks legs as high in the yokes as possiable

    shortening the Wheel base

      also i dont like the air caps and soft springs on the 349

    ,again if the springs and caps (with a large spacer) from the 348 and droping the yokes to shorten the fork improves it again,

    any difference between the swinging arms is marginal and there is plenty of space to elongate the axle slot and shorten the Wheel base

    cheers helm

     

  10. Ty80 Continually Loses Kickstart Spring Tension

    in Yamaha

    Posted

    Hi

    had similer problems

    check that the locating recess in the crankcase for the spring has not worn,i was able to reshape mine with a dremal

    if you have the haynes manual page 47 shows the kickstart assembly

    part 9 is a small circlip one side is flat this needs to be towards the spring guide,overwise they can fail

    is the spring locating properly in the shaft?

    can,t think of anything else

    cheersq helm

  11. Cota 247

    in Montesa

    Posted

    HI

    I've had the same problem when buying plugs singely over the last 15 years to get round it in the end I buy packs of four from car spares shops,it works out slightly cheaper

    cheers

    helm

  15. 1979 Montesa 349 Restoration

    in Montesa

    Posted

    hi

    i think the chain tensioner is standard as per the parts book and is the same as on the 348

    mine is a french reg 1979 and an early number

    only difference to a uk bike should be the petrol tank ,mine is plastic,

    for the uk it should be a cover with a alloy tank underneath,

    when i read my previous post i have not made it clear?that the chain guard is the one in the picture mounted on the crankcase

  16. 1979 Montesa 349 Restoration

    in Montesa

    Posted

    hi

    those look like kick start return springs

    i have the same model 349,it too leaked from the same place ;it had been modified by fitting a metal sleeve round the shaft' and a larger internal diameter oïl seal to fit the sleeve this appears to lubricate the chain ....in reality it only lubed the floor....i took the sleeve out and the carefully hooked out the seal(no need to split cases) i then carefully pressed in the new seal using a large seal and the old seal flat face to face....looks like your missing the chain tensioner on mine it is mounted on the lower bolt holding the chain guard it should be the longer of the two bolts don't know if you can swop just the one bolt and not split cases you will have to remove the clutch cover ;to get at the bolt head

    on mine i'm fitted 348 springs and use two preload spacers each side and no air overwise they need about 15lbs but you can't trust them to keep the pressure,i also raise them in the yokes as per your photo or if you find acomplete set of 348 legs which are shorter hope this helps

  19. My New 1975 Montesa Cota 247 (Pics) Hot Starting Problems. It's My First Two Stroke.

    in Montesa

    Posted

    HI

    IS THE CONDENSOR STILL MOUNTED ON YHE COIL, NEXT TO THE POINTS; IF SO THIS COULD BE THE PROBLEM AS THEY ARE PRONE TO OVERHEATING.IF YOU SEARCH THE THREDS THIS HAS COME UP BEFORE;;;

    ALSO CHECK THAT THE HEAT SHIELD BETWEEN THE CARB AND BARREL IS FLAT AS AIR LEAKS HERE CAN CAUSE PROBLEMS

    FINALLY IF POSSIABLE TRY A DIFFERENT COIL AND CHECK THAT IT IS BOLTED TO BARE METAL FOR GOOD EARTH

    CHEERSZ

  24. Cota 247 Piston

    in Twinshock

    Posted

    Hi cota 247 pistons don't have a window or port in them ,that sounds like a bultaco piston as well,,,

    i havn't used a piston with a window in one would this make the engine noisey ?

    out of choice I would use the correct piston,,,,,

    cota 247 start at 71MM 237.5 CC this I believe was to get round import taxes

    ,so you could already be on your 3rd rebore 2 more to go

    pistons are available from http://kevinbreedonracing.co.uk/products_pistons.asp

    also in spain from http://www.rectificados-bellavista.com/Pistones.html

    hope this helps cheers helm

  
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