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jaan

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  2. Cota 348 Fork Springs

    in Twinshock

    Posted · Edited by Jaan

    I mounted 27x 30 mm spacers and the fork works fine. Have yet try without spacers.

    I'm not sure about my fork oil, I use modern Bel-Ray High Performance Fork Oil, 10W.

    What's your experience, opinion, advice?

  4. Cota 348 Fork Springs

    in Twinshock

    Posted · Edited by Jaan

    I was going to replace thirty years old front fork springs. The length of the new ones (which were said to be for 348!) were only 47 cm but my original are 50 cm. What's the right length?

    So whatever it is, I desided to lathe some nylon spacers (30-40 mm) and try with them.

  6. Amal To Oko Carb

    in Twinshock

    Posted

    ... in your opinion is there anything wrong with the Amal in general?

    Only the same poor zinc alloy material of both body and slide.

    I replaced the slide but the carb body too is a little bit worn and soon perhaps the new slide too.

    I want to check if this is true too for my 348, Mikuni flat slide and me:

    "Fitting an OKO to any Spanish bike that still has the very poor and often badly worn OE carburetion fitted, does make a tremendous difference to these machines, and results in a bike that is smoother, more powerful, and much easier to ride in serious competition."

    (http://www.classictrial.co.uk/okokitsspanish.html)

    If Montesa Cota 348 + Mikuni flat slide doesn't work, then I'll try Keihin 28 mm round slide carb.

  7. Amal To Oko Carb

    in Twinshock

    Posted

    Hi cmt320

    I'm going to change from an Amal to a Mikuni 28 mm flat slide carb VM28-418 or a Keihin PE 28 mm round slide carb. Have to try which one of these two works better with Montesa Cota 348.

    I've bought these carbs as new on eBay with standard jetting. I'll lathe an adapter from carb to airbox. I'll start with standard jetting and then I have to try and try with different jets etc. so that at last the jetting is as good as possible.

    All kind of tuning info, jets and parts are available, from example:

    http://justkdx.dirtrider.net/printcarbtuning.html

    http://keihincarbs.com/home.html

    http://www.allensperformance.co.uk/index.html

    http://www.keihin-us.com/list.htm

    http://www.sudco.com/mikuni.html

    http://www.dellorto.co.uk/

    http://www.showandgo.com.au/jet/jet.htm?je....html~mainFrame

    http://www.mikuni-topham.de/

    http://www.mikuni.com/pdf/vmmanual.pdf

  10. The Best Twinshock Ever?

    in Twinshock

    Posted

    Thanks mates, I do appreciate your opinions!

    However I'm so poor trials rider that I don't need the best twinshock ever.

    Montesa Cota 348 just good for me (both she and me are heavy and our power is slow :D)

    Perhaps I'll upgrade or improve my 348 somehow: new front fork springs, better brake pedal, Mikuni or Keihin, fat bar?

  11. The Best Twinshock Ever?

    in Twinshock

    Posted

    the spanish bikes are from an other generation (ossa gripper not included). they are heavy and power is slow, not so good for narrow and hard sections but ok for more open sections

    regards bob

    How about the younger Montesas 242 and 330?

  15. Electronic Ignition?

    in Twinshock

    Posted

    Jaan,

    --- It's really the Carb that can be its Achilles Heel! ---

    RMM

    Yes, I know. Just a year ago I replaced the worn out slide, but obviously the body too is a little bit worn.

    The only way seems to bore out the body and insert a sleeve and sleeve the slide too.

    Perhaps it would be better to use some other carb, Keihin or Mikuni, even if it's not easy to mount them to 348?

  20. Problems With Amal Carb?

    in Twinshock

    Posted

    It was both right crank seal and condenser!

    Two faults at the same time, that's why it was too difficult for me to sole the faults.

    Fortunately you mates and a really experianced Finnish trial veteran in Finland helped me. Thanks for you all!

  23. Inner Fuel Tank?

    in Twinshock

    Posted

    So this alloy tank was not laminated inside the glass fiber cover? Was the alloy tank mounted to the frame or to the glass fiber cover? What kind of was the tank brackets?

    Montesa glass fiber tanks have often problems as all other glass fiber tanks. Would it be worth to use this kind of inner alloy tank?

  24. Adjustable Clutch And Brake Levers?

    in Twinshock

    Posted · Edited by Jaan

    Thanks mates!

    Axulsuv, have you any idea on the make or manufacturer? It would be much easier for me to buy them from some EU country. I haven't yet found any firm that sells those ones in Europe.

    I emailed BJRacing. Shipping to Finland would be $70-80, more than two levers! No deal. Have to try European dealers.

  
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