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Project The 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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    Want to do some shopping for swingarm bearings. The linkage has three needle rollers and no listing in parts book. Anyone know what they are?
     
  2. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Well thanks Kiffsta but they are the swingarm bearings not the suspension link.
    I have already made this list but missing the 3 link bearings.
    91063-KV3-831 x 1 Swingarm Bearings 24x31x20 NTN HMK2420
    91251-KV3-831 x 1 Swingarm Seals 24X32X5.5 SDO
    96100-60020-10 x 2 Swingarm Bearings 6002
    94520-32000 x 1 circlip 32mm
    91201-196-003 22x32x7 Seal
    52105-MJ0-000 Sleeve?
    52106-KT7-760 Sleeve?
    91262-KV3-831 x 8 Seals
     
  4. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Sorry mis read your post, looks like it is a complete unit and bearings not listed separately , might have to pull them Out and match them at a bearing shop
     
  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    So I got a Chinese copy fuel tap, charged the undersize battery and started it again. I am confident that the fuel tap in the off position works so time to move onto the black smoke issue.
    Now I'll skip all the usual broken and butchered parts and just get to the good part.
    Let's begin with a float bowl, they are all like that.
    Carb_01.jpg
    Mmm, nice work.
    But wait there's more.
    Carb_02.jpg
    Now I know what you are thinking, "what the hell is that?"
    Carb_03.jpg
    Pieces of aluminium wrapped around the float to hold the needle (in the race position, I assume).
    Words fail me so I'll let you make up your own.
     
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    Last edited: Feb 8, 2018
  7. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Words can’t describe that
     
  8. ruckusman

    ruckusman Well-Known Member Premium Member

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    Magnificent is a good word
     
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I'll try to get OEM float needles and jets from the local Honda shop. That float needle is used on a gazillion models so I might get lucky. The choke mechanism is completely destroyed like lots of things.
     
  10. Murdo

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

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  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Thanks Murdo I see them at the bottom of that page https://www.ebay.com/itm/Carburetor...m=152159175973&_trksid=p2047675.c100005.m1851 but with float needles I am reluctant to use Chinese jobbies. I could get lucky at the local dealer, once we get past the inevitable "What model is it for?" question which takes a very long time with the language barrier. Speaking of luck, the back of the engine has some details written in pink marker, just like you see on the Japanese auction sites. I am betting that this is a replacement engine that was fitted. Which would explain why the engine feels so fresh and everything else is rotten.
     
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  12. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Lucky you didn’t buy an Aussie mc22

    EA63E7DB-658D-4F7B-808D-D69A16737C53.jpeg
     
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  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Can get genuine float needles here but they cost the planet, so I ordered Chinese ones as a temporary fix and will get original later. I got a set of OEM tank rubbers, had none before and the tank had been digging into the frame. Didn't get the flanged bush for the rear mount so made one instead. Looks like my mounting bracket needs a bit of panel beating too. Now to fix the butchery on the front bracket.
    Tank_Rear_01.jpg
    Tank_Rear_02.jpg
     
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    Last edited: Feb 9, 2018
  14. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    You can take the boy out of Gladstone but you can't take Gladstone out of the boy. I worked there once, that was in a different lifetime.
     
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  15. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Working on the carbs, mmmm. I had some old Keihins here from what looks like a 400 four cylinder so pulled it to pieces to check out the throttle shaft seals. On the blind side it uses a seal almost identical to the Mikuni except it has a metal shell, is slightly larger in diameter, and is not retained by anything, in other words you could pry it out and fit a new one. On the other side is a felt seal. The only other difference is the screws have a flat head. Add it to my list of things to do. The pic shows the Keihin seal and my seal for Mikuni below it. Both are in the 'fitted view'. You can see how much the old seal has perished. It was vey easy to blow air into the carb body via that perished seal.
    ThrottleShaftSeals.jpg
     
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    Last edited: Feb 10, 2018
  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    In the name of science and motorcycle owners:
    Here is my MC22 seal in situ. It is not possible to blow through it (yes, stick it in your mouth and blow) like the one I previously mentioned. A fair test I imagine, but the cracks are appearing so only a matter of time before it fails. There is quite a bit of controversy surrounding whether or not one should replace these seals, but I can assure you the one I tested previously and removed, would be leaking air into the intake, and no one would ever get it to run well, sound familiar?

    Notice the three stake marks. Those might make things more difficult if you try to fit a metal seal like the OEM part. If I made some soft seals like the Mikuni with the slightly larger diameter then it would be easy to fit them without removing the shaft.
    KeihinTS_InSitu.jpg
     
  17. Andych

    Andych Well-Known Member Premium Member Contributing Member

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    The things some people will put in their mouths.. or put their mouths on :)
    We all appreciate the extent that you go to to develop cures for these bikes :D
     
  18. Murdo

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

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    Those seals will make a lot of difference to the idle. Thanks for taking the time to make them.
     
  19. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Now I know everyone is scared "Aaaargh the staked throttle shaft screws" and well you should be because the Keihin jobbies are seriously staked. Fear not, we have the solution.
    http://litetek.co/Guide_MikuniBDST_Rebuild.html#Staking
    Here is a pic because I know you are lazy sods.
    Staking_02.jpg

    I will get some stainless flat head screws for the Keihins also. The over the counter M3 screws that you buy are like plasticine and I would not recommend them.
     
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    Last edited: Feb 10, 2018
  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    So my footpeg bracket assemblies arrived from China and the old ones are definitely bent. When I rode the bike the tiny footpegs and very short levers did my head in, and I am only 5'10" (178 cm). Fortunately the Yamaha 400 parts fit so I will use them. I am going to make my own lugs in the near future. The Honda gear lever is almost 20mm shorter than the Yamaha one and you can see the difference in the size of the pegs.
    footpeg.jpg
     
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    Last edited: Feb 10, 2018

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