The vintage Montesa Cota mini-bike thread

Discussion in 'Trials' started by Brewtus, Dec 11, 2017.

  1. Huzband

    Huzband Team Dirt

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    "Junk" you say?








    :hide
    #61
  2. Brewtus

    Brewtus Buffoonery, Inc.

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    Dammit boy, DON'T make me come out there!! :dirtdog :bluduh

    :freaky
    #62
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  3. Huzband

    Huzband Team Dirt

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    You said it, all I did was quote it. :D
    #63
  4. Brewtus

    Brewtus Buffoonery, Inc.

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    :bandit
    #64
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  5. Brewtus

    Brewtus Buffoonery, Inc.

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    Just now watched "Overhaulin" for the first time.

    Yeah.... Don't call those guys. :puke1
    #65
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  6. Trevor Hallam

    Trevor Hallam Adventurer

    Joined:
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    1782F6E3-1131-409C-BE67-6AB3ADDFA1A8.jpeg DEEEFD21-9B4F-4EB2-9727-070EF0629E66.jpeg 6A8A96EA-CE12-4262-9F10-4B3F2E73DDFC.jpeg 8F25879A-0221-4452-AC30-BAEE18334942.jpeg Have had some time this fall to start picking away on my project. Looks to be pretty complete, missing the odd washer or smaller piece here or there. Pretty much all of what’s there is serviceable too! Waiting for my zinc plating kit to come from Caswell to do the fasteners and such and then can get blasting and painting frame parts. (Have been wanting one for a wile, this will be my project to learn on) I’m fighting with whether to re-chrome or not... there are very few pieces that need it so it might not be bad, but i’m not sure it’s worth it in a little guy like this... someone talk me out of it? Could be fine with painted rims and bars etc. The fork stanchions will need it though.
    #66
  7. Trevor Hallam

    Trevor Hallam Adventurer

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    Only four pics allowed per post... here’s the rest 1CE55C58-5227-403A-8DDB-A9C48DD33CD6.jpeg 84E38ED8-02EF-4F22-9032-C52A761D919A.jpeg DAC3BAFC-0131-420C-B2B9-CA8E7676193C.jpeg
    #67
  8. oldtrialer

    oldtrialer Trials since 74

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    Use toothpaste to clean the rims and then clear coat.
    #68
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  9. Portlandtyist

    Portlandtyist Been here awhile

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    7AD7C0C0-DD08-4788-AC0A-9A458A4269AF.jpeg E8967900-53DE-4BD8-8374-974F141D3CD6.jpeg My son and I just got a bucket/bin full of Cota49 parts. All is basically there. We have parts diagram but nothing else.
    We will attack the engine first. We are a little flummoxed about the left and right pedals. Are they kickstart levers for either side?
    Any ideas ?
    Thanks.
    #69
  10. Trevor Hallam

    Trevor Hallam Adventurer

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    They are pedals, like you would have on a moped. I’m not sure why they did that on the 49. They used the same engine on a few other things too, like the Mini Montesa, which was actually a moped. My 25c had te holes in both side covers for the shaft, but has a blanking plug in one side, and the kickstart shaft is shorter and has a ratcheting freewheel that connects to the crank via chain. Look for cota 49s on YouTube and you’ll find a couple of vids of guys starting them. Here is a pic of the mini montesa I found, as well as the page from my 25c parts book that had the starting assembly.

    Attached Files:

    #70
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  11. Portlandtyist

    Portlandtyist Been here awhile

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    99E053DF-FFFD-4006-99FF-559205EA82F1.jpeg
    #71
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  12. Portlandtyist

    Portlandtyist Been here awhile

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    View attachment 1543336 View attachment 1543337 View attachment 1543338 View attachment 1543336 View attachment 1543337 View attachment 1543338 View attachment 1543338 A little progress on the Cota49.
    -Steering put back together
    -Carb being cleaned (need a Dellorto rebuild kit)
    -Engine ready to split. But need correct f/w puller ANYONE KNOW THE ONE WE NEED?
    -Engine cleaning
    -Need new clutch friction plates and springs. Only 4 bolts on our machine. Ought to be 6 I think based on holes on pressure plate.
    #72
  13. Portlandtyist

    Portlandtyist Been here awhile

    Joined:
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    129
    Location:
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    754C2575-2C76-47F3-A16D-D9294B95177E.jpeg 0445A911-7837-4A50-8E63-A88E6474550F.jpeg F610F483-41A1-4FC8-A3FF-717D9B7EED27.png View attachment 1543336 View attachment 1543337 View attachment 1543338 View attachment 1543336 View attachment 1543337 View attachment 1543338 View attachment 1543338 A little progress on the Cota49.
    -Steering put back together
    -Carb being cleaned (need a Dellorto rebuild kit)
    -Engine ready to split. But need correct f/w puller ANYONE KNOW THE ONE WE NEED?
    -Engine cleaning
    -Need new clutch friction plates and springs. Only 4 bolts on our machine. Ought to be 6 I think based on holes on pressure plate.
    #73
  14. Portlandtyist

    Portlandtyist Been here awhile

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    For those interested, the puller for the Motoplat 960054 found on the Cota 49 is: 27mm 1.25
    We removed ours today. Ordered the carb rebuild kit for the Dellorto 14-14. Cleaned up the case covers and setting up for the case to be split. Any pointers on this operation would be greatly appreciated!!!
    The clutch was basically dilapidated. Friction plates were mush. I hope we can reuse the plates. Any input on plate criteria would be appreciated too.

    Attached Files:

    #74
  15. Brewtus

    Brewtus Buffoonery, Inc.

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    Sitting around the house being sick for the past 4 days is very bad. With all the time I've had on my hands the harebrained ideas have been flowing quite nicely, and believe me they usually don't need any help. I had considered this earlier, but now I think I'll move forward with it.

    When I originally acquired my Ozark Orphan, I sorta envisioned a TY80 powerplant in it. That plan got scrapped after a short conversation with @LowPSI, and REALLY got scrapped when a few simple measurements showed that the Yam 80 was simply too big for the compact (read: friggin' tiny) bike. I scabbed some TY80 wheels and tires on it (the originals are corrosion-seized to the hubs and flaking apart) to wheel the bike around instead of carrying it, and taking goof pics.

    Last summer I acquired a "parts bike" for the Orphan, a Type 74 Cota C. It had been purchased by a fellow in Washington state at a yard sale, and when he found out what it was (and more important, how much $$ it would take to "restore" it) I offered to take it off his hands. We came to an agreement, and @Portlandtyist was kind enough to ship it to me. :thumb

    [​IMG]

    I've been slowly cleaning it up over the past few months, and thinking that there is WAY too much here to be just a "parts bike". Wheels/hubs, a 3-speed lump and a seat/tank assembly and this is a complete bike. I had been half-heartedly looking for those components when the idea of a donor engine once again started dancing in my head. We already know that the Yam 80 is too big, so a smaller manual trans engine is in order.

    Sooo, why not a small Honda engine? :hmmmmm

    First thoughts naturally went to a laydown 4-stroke engine, but those are also too large for the real estate I have to work with. I needed a manual trans Honda mini 2-stroke. While mulling over that one, I remembered that a good buddy of mine has a Honda MR50 Elsinore that he has used as a pit bike for many years now. A bit of Gooble research and I think I'm on to something...

    [​IMG]

    Small, 2-stroke, and the Mister Fitty has a spine frame similar to the Cota -

    [​IMG]

    Well now..... :evil

    Will it work? Who knows, I will have to take a measuring stick to a Fitty engine (the above images are Gooble images, not mine!). Another good friend has a Fitty project in his Shed of Treasures so I may beg him to unearth it, maybe even with the 25C frame in tow with the forks and swingarm temp installed to get an idea if it is feasible or not. Wheels/hubs can be donated by a Yam 80 (believe me, I have those), so the seat/tank unit would be the next hurdle. They are available in Spain (for obscene prices), or maybe I'll stumble across one here in the States just like I stumbled across these 2 25s. :D

    Yup, great idea Brew! Choose a hard-to-find 45-year old Honda mini-bike engine (or ratted parts bike! :deal) as a donor for your hard-to-find 45-year old Montesa mini-bike. Makes total sense! :jump

    Now on to harebrained ideas for my old Dodge ramp truck...... :rolleyes

    More to come.....
    #75
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  16. Portlandtyist

    Portlandtyist Been here awhile

    Joined:
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    167C2029-E9B0-4E0A-A2FA-6AE0C0B23C6C.jpeg 5DFEC13B-B0FB-426F-9FA4-4CA6D442B44A.jpeg That Brewtus......whatever the heck ails him is having a contagious effect on us here in Portland OR. Above are the clutch accoutrements we need.
    #76
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  17. Huzband

    Huzband Team Dirt

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    He is infectious isn't he. :D
    #77
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  18. Brewtus

    Brewtus Buffoonery, Inc.

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    Holy rusted crankshafts, Batman!! :eekers


    I get that a lot. Must have something to do with my tall regal stature, my boyish good looks, and devastating charm. :thumb
    #78
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  19. Solarflares

    Solarflares Been here awhile

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    Norfolk , UK
    This just appeared on Ebay UK last week.
    So I’m posting these as a source of inspiration.
    Bike is $5,000!
    I was after a 123 , until I found that tires were unavailable. Seems the 172 is a much better option.
    But they are very hard to find here.
    Still , enjoy the pics.

    67491033-5B52-4683-BC4A-E1BAE3352EC4.png 2151A800-0B25-4416-9906-20B8B35513E2.png 78F21EA5-5143-4328-AA69-1DEF02DB4CE3.png BFBA70A3-1C56-4534-9CC0-A73FA0821F43.png
    #79
  20. Huzband

    Huzband Team Dirt

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    Proof that a turd can indeed be polished. But 5k? :photog:loco
    #80
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