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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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    Fully stripping the carbs and will blast and paint them. I don't have all the odd parts for the Keihin throttle shafts yet, so I will put them back together with new felt seals and the old rubber ones. Will pull them apart again when I have all the parts and finish the job correctly. Removing the Keihin throttle shaft screws has to be done perfectly, zero room for error. I added some updates to my staking posts and will make a full Keihin rebuild guide when I have the parts finished.
    http://litetek.co/Guide_MikuniBDST_Rebuild.html#Staking
    Keihin_Rebuild_02.jpg
     
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  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The Fuel Tap Saga:
    So I bought one of these https://www.ebay.com/itm/Fuel-Gas-Tank-Tap-Switch-Petcock-For-Honda-NSR250-MC21-CBR400-NC23-NC29-CBR600F/221802481518?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649 $11.69 USD
    on the off chance that it would have the right thread size, it does. The outlet is too big but the Tygon fuel hose can go over okay. The reserve pipe is way too long but that can be easily cut and the outlet is on the wrong side but I don't care about that. Finally the square drive for the fuel tap handle is too big. Anyway, no more vacuum diaphragm and if I forget to turn the fuel off then it is my fault.
    FuelTapManual_01.jpg
    FuelTapManual_02.jpg
     
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    Last edited: Feb 14, 2018
  3. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    And to think you used to just sit and read and have a snicker about our battles with old inline 4s :commando: .... now u get to enjoy them first hand .... :lolsign:
     
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  4. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    That's called schadenfreude
    ˈʃɑːd(ə)nˌfrɔɪdə,German ˈʃɑːdənˌfrɔydə/
    noun
    noun: Schadenfreude; noun: schadenfreude
    1. pleasure derived by someone from another person's misfortune.
      "a business that thrives on Schadenfreude"
     
  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Yep, every problem you solve you create some more. I will have to use a quick connect on the fuel line because the hose is so tight.
     
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I had to get my wheels powder coated, a long story. Anyway, while I wait for that to be finished, I made some new spacers for the front wheel from some 7075 I had lying around. Note the 'chromed' oem parts, does my head in.
    FrontWheelSpacers.jpg
     
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  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Finally got paint and air brush sorted and stripped all the carbs. The two outside carbs seals use metal shrouded rubber seals on the outside, and all the others are felt. Everything is underway but these custom seals are going to hold me up. Painted the two carbs I had prepped.
    MC22CarbsPaint_01.jpg
    So full 'B' kits will be available for Keihins and I will do a comprehensive rebuilding guide like the one I did for Mikunis.
    Cheers
    Blair
     
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    Last edited: Mar 8, 2018
  8. beano

    beano Well-Known Member Premium Member

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    you're a hero Blair!! carbs look fantastic.
     
  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Well thanks @beano, it is getting there.
     
  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Finished the wheel spacers except for the thin walled one which goes in the sprocket carrier. Back to carbs now.

    The old
    WheelSpacersOld.jpg

    and the new
    WheelSpacersNew.jpg

    My axles have also been chromed, ugh where does it end, so I might make a new rear axle out of Ti just for fun.
     
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  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Wheels are done so I bought a pair of Michelin Pilot Street tyres for them (164 AUD).
    Just need to get the bits for the carbs finished and it will be sort of rideable again.
    Wheels_01.jpg
     
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  12. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    Can you pop them onto the scales for a weigh in and list which bits are removed, looks to be everything - so it's bearings, spacers etc

    I'm interested to compare their weight with FZR wheels
     
  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Sure, that pic is from the powdercoater so I will get them late next week.
     
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  14. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Tyres arrived today, Michelin Pilot Street. The rear, a 140/70 x 17 weighs 5375 grams. The slightly worn old tyre that came off was a 150/60 x 17, only has the word "Corsa" written on it (not a Pirelli) and weighs 6012 grams (637 grams difference). Now this is not a very fair comparison because you need to know the weight of the same brand etc, but it does give some indication. People spend vast sums of money trying to reduce the weight of their wheels by using magnesium or Carbon for example. The benefits of this are obvious if you have ever ridden a bike, especially back to back, with these lightweight wheels (I have). It turns, accelerates and stops faster. The thing that is most important with the mass of the wheel is where it is located. The closer you get to the tyre the more you will have to overcome inertia and gyroscopical forces, so the weight of the tyre has a significant effect on performance. Now there are two reasons people give for fitting a wider tyre, the first is that they will have more grip and the second is that it looks better. I will ignore the second one. If you are actually power sliding your rear tyre on a regular basis then more power to you and go ahead and try the larger size (with a stopwatch). For the rest of us, I suggest you think twice before fitting a bigger tyre. The advantage that the little sports 250's have is that they can turn on a sixpence, why kill your ace card?
    Michelin140-70.jpg
    Interesting video and I have experienced exactly what this guy says.
     
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    Last edited: Mar 20, 2018
  15. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Great Tyre choice, that is what I run on my mc22 , great Tyre life and good grip
     
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  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    @ruckusman
    Completely bare
    Sprocket carrier = 691.4 grams
    Rear Wheel = 4912.3
    Front Wheel = 4011.9
     
  17. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    I just re-read that, we pay around $300 - $330 for a pair, some advertise cheaper but always say they are out of stock, we get bent over in this country on tyre prices. Someone is having a very big drink on us.
     
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  18. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    It's like that on so many products - exclusive distributorships where the distributors take trademark licencing so that no-one else can import and then legally market the products - we get charged what companies think they can get away with
     
  19. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Well these ones are made in Thailand, so the price is going to be lower than the normal low price. They are also 'S' not 'H'.
     
  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    My thermostat mmmm great. To be expected and no coolant used of course. Why spend $2 when you can just let everything rust to hell.
    Thermostat.jpg
     
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