/ Register

  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Help MC22 overheated

Discussion in 'Honda 250cc In-line 4's' started by thebeefsalad, Aug 2, 2018.

Page 2 of 2
  1. thebeefsalad

    thebeefsalad Well-Known Member

    Messages:
    490
    Likes Received:
    301
    Trophy Points:
    273
    Joined:
    Feb 28, 2015
    Gender:
    Male
    Location:
    San Antonio, Texas USA
    And the fun continues! 3rd box of parts just showed up, good news is it was in better condition than the last 2. Cams look good so I called Millenium Technologies to see how much it would cost to fix the cylinders. Bad news is the cost is $1600us ($2400 aud). And of course there are no OEM pistons or oversized OEM pistons. Chinesium pistons scare the hell out of me. They weigh a lot more than the OEM pistons, so I would also have to re-balance the crank in addition to poor finish. A tiny bit more info here https://2fiftycc.com/index.php?threads/look-what-the-postman-brought-today.9525/page-24#post-130233 not that it likely matters.
     
    thebeefsalad, Mar 5, 2020
    #21
  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,233
    Likes Received:
    1,421
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    ruckusman, Mar 5, 2020
    #22
  3. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,233
    Likes Received:
    1,421
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    Four oversizes available - get in touch with either Mike Norman or Dave Moss to get their opinions on these - Mike used them on the Dave Moss engine build

    https://www.aliexpress.com/item/32277416585.html

    If you trawl through these photos you'll find some with pistons which have 75 etched on them - I suspect that Mike went to 49.25 oversize in that build as there's also photos with what looks to be less material on the sleeves between some shots among the albums

    https://www.dropbox.com/sh/x1m7hzedjmceysg/AACtUSSb5MLZDe8Hbr3DoJFQa?dl=0
     
    • Love it! Love it! x 1
    ruckusman, Mar 5, 2020
    #23
  4. thebeefsalad

    thebeefsalad Well-Known Member

    Messages:
    490
    Likes Received:
    301
    Trophy Points:
    273
    Joined:
    Feb 28, 2015
    Gender:
    Male
    Location:
    San Antonio, Texas USA
    Any references on using those pistons? While the bore size is "near" I'd have to wonder about other specs. Mike Norman informed me the sleeves are cast into the cylinder, but we didn't go much beyond that.
     
    • Like Like x 1
    thebeefsalad, Mar 5, 2020
    #24
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,233
    Likes Received:
    1,421
    Trophy Points:
    918
    Joined:
    Oct 1, 2013
    Gender:
    Male
    Location:
    Narrabeen, NSW Australia
    My Bike:
    Yamaha FZR250 3LN1
    That's in this post

    https://www.2fiftycc.com/index.php?...2-racing-in-california.8371/page-2#post-94334

    Now this might sound crazy, but if you went to 49.0mm AND if ZXR250 OEM rings are available and perfectly compatible in all respects you could potentially use those

    This image album from Mike Norman on the Dave Moss build has him cutting the valve recesses

    https://www.dropbox.com/sh/x1m7hzedjmceysg/AAAnNGYQUYFZvmZhTAdhyDg4a/Moss MC22 2017 Build?dl=0&subfolder_nav_tracking=1

    This image has the .75 stamped into the piston clearly visible

    https://www.dropbox.com/sh/x1m7hzed...oss MC22 2017 Build?dl=0&preview=IMG_5515.JPG
     
    • Like Like x 1
    ruckusman, Mar 5, 2020
    #25
Page 2 of 2

Share This Page