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Project Konica Minolta MC22 - not so glacial project

Discussion in 'Your 250cc Projects' started by maelstrom, Jan 21, 2018.

  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    That is my prototype, a work in progress. @kiffsta gave me some old ones to work with. Tooling costs for those kind of rubber parts are horrendous so I cannot afford any errors.
     
  2. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Sweet, we need these ASAP
     
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Goodbye Scooter Brakes 2:
    Have to get rid of the ridiculous scooter brake caliper on the rear now. First task was to cut and weld the OEM footrest bracket to accept the 12mm Brembo rear master cylinder. The mounting holes being closer together on the Brembo part. I am not too concerned about the finish and detail on these because I want to make my own rearsets later, and no they will not be adjustable.
    I have already done two designs for the caliper bracket. One was to use the OEM swingarm location method and the other is to weld a lug onto the swingarm and use a torque rod. I am leaning towards the second version since the first one will be more difficult, more expensive and I doubt that MC22 owners would want to buy them anyway.
    RearMasterCyl_01.jpg
     
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  4. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Hi @kiffsta can you pm or email me please. I cannot seem to get in touch with you. I need some Honda bits.
    Cheers
    Blair
     
  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    After binning the 520 conversion I got a new rear sprocket (lucky for me it was black) so made some Ti washers instead of the 'chromed' ones.
    Sprocket.jpg
    S__4063241.jpg
    and did some work on the rear caliper bracket. I have to plan ahead for the torque arm bracket that I will need to weld to the swingarm.
    Brembo_Almost.jpg
    Yes it is a fake. I have a genuine normal jobby, see below, but it cannot be fitted without milling or turning away the bosses that support the disc bolts. The 'race' caliper has a far shallower profile, so is the easiest fit, but paying five or six hundred US dollars for a real one is not an option.
     
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    Last edited: Sep 8, 2018
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    This is the garden variety Brembo that is used on the rear of many bikes. Not possible on the MC22 without a lot of work.
    Brembo-05.jpg
     
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    Last edited: Sep 8, 2018
  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    and marked out the seat for the shortening process. Once that is done I can get onto making the new sub-frame and start on the under-seat exhaust.
    Seat_05.jpg
     
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  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Don't really mind the the look of having the caliper on top either. Easier to run the line.
    Brembo_06.jpg
     
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Footpeg Stuff:
    The oem footpeg mounts are never going to give me enough clearance to get the ex pipe behind the RH support. Poked around and found a CBR600 that uses an under seat exhaust and has the pipe exactly where I want it, so I bought some Chinese versions. I am hoping they are not made of gingerbread so I can cut and weld them.
    RearSets_03.jpg
     
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  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The Chinese 600 footrest assemblies arrived and they are a lot smaller than I imagined. To make these work I will have to go full Murdo on them.
    S__4104197.jpg
     
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    Last edited: Jan 11, 2019
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    So working on the sub-frame design. This is a plastic mock up that I 3D printed. I have the four front mounts and tank mount position accurately done and just need to get the angle of the top rails right. The seat will kick up a little higher at the back when I get that angle right. Then I need to make a mock up of the under seat exhaust to ensure that it clears everything. When I am happy with it I will make a jig and fabricate in aluminium. Too hard to get square tube with 3mm wall so I am going to use round. I am very happy with the look of the seat and I need to decide whether to go with 4 tailpipes (ala MV Agusta) or 2 (like 748 Ducati).
    SubFrame_02.jpg

    SeatMounted_02.jpg
     
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  12. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    How cool is that thing going to look? 2 or 4 pipes...decisions decisions! Almost enough room for a Zonda quad pipes setup. I thought being a Ducati man you'd automatically go for the 2 (I would).

    Zonda.jpg
     
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  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I think pretty cool but I am biased. Actually it looks a lot better in real life than the photo. The fairing, which will be half, will look like this. I am going to ditch the top fairing bracket also. I can't stand those stupid things. Will use carbon fibre to reinforce the top and hold the mirrors. Yes, it doesn't have the look of the modern pieces of dogshit but that is intentional.
    RC30_Intro_Pic1.jpg
     
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    Last edited: Jan 27, 2019
  14. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    I actually think it's going to look great. That's the beauty of making something bespoke...some love it and some don't, but as long as it's what you want, then we're all good.
     
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  15. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Thanks Frank, just have to get it done now. Will be a bit poor until the New Year but I can get cracking on all the work that just needs my labour.
     
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  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Cliponology:
    Fiddling around with the handlebars and the end weights drove me insane. The Honda bars are a steel tube fitted and pinned over an alloy stanchion clamp. I removed the steel tube and replaced it with an alloy one. Not to save weight, just because that is what I have lying around. Then I made a little drilling jig to get the pin hole in the same place. I might also do a plug weld just to be sure. Filed off all the casting flash as well so it looks better when painted.
    DSCN4299.JPG ClipOn_03.jpg
    DSCN4308.JPG
     
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  17. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Drew up the finished bracket for the rear caliper. I was going to run a torque arm and all that but then thought that it would be nice to allow others to buy the same piece if they are as crazy as me.
    Brembo_220_RaceSwingarmMount.JPG
     
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  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Cliponology II:
    Taking a page out of the good doctor's book, I used my lathe as a mill and did the slots for the plug welds, welded and gave a bit of a tidy up. Spot the pin hole, but I don't care it is a 'character' hole.
    PlugWeld_01.jpg PlugWeld_02.jpg
    I would like to blast and paint with the Cerakote Titanium but it is such a headache of a job. Alternative would just be to send them off and have them powder coated 'Texture Black' like the R4 frame.
     
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    Last edited: Feb 3, 2019
  19. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Powdercoat will be too thick, you'll have to sand it down to get the throttle tube and levers on.
     
  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    aah yes, glad somebody is on the ball. Time to try the paint I guess.
     
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