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JIS (Japanese Industrial Standard) Drivers

Discussion in 'General Tech' started by 1foxracing, Jan 21, 2015.

  1. 1foxracing

    1foxracing PR Addict

    Location:
    Midvale
    Racing Number:
    Photo Grunt
    I don't know if it's widely known in the MX community that Japanese "phillips" screw heads are different from others. I work on motorcycles out of my home and I can always tell when someone tried to use a regular phillips #2 driver and mangled the head. This was a big problem on 1970's streetbikes where many engine covers were held on with JIS screws. Most screws back then required a impact driver to remove engine side covers and such.
    I'm not sure if modern 4-stroke MXers even have many phillips type screws or have moved to Torx or triple square like modern streetbikes. If you are having problems with screws on your Japanese motorcycle you might want to try a set of these.
    This is a Hozan JIS set I recently picked up on Amazon. Vessel tool is another good brand that makes them as well.
    http://www.amazon.com/gp/product/B003F63WI8/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

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    Standard #2 Phillips on the Left, JIS #2 on the Right.
    [​IMG]
     
  2. DTS

    DTS PR Addict

    Thanks for posting this!
     
    1foxracing likes this.
  3. 1foxracing

    1foxracing PR Addict

    Location:
    Midvale
    Racing Number:
    Photo Grunt
    I just finished a 4 bank carb rebuild and can show how to ID these JIS screws now. I can almost guarantee if you are working on Keihin or Mikuni carburetors you will see these JIS screws. I hope everyone can see the little dot at the 12:00 position on the head, that dot identifies these as JIS type but they don't always have this. On other folks bikes I usually replace these with Hex heads to prevent damage down the road. If you use the correct JIS drivers your screwheads won't get mangled like these.
    [​IMG]
     
    chubakka, Vet261 and mjshafer62 like this.
  4. jms158bmx

    jms158bmx PR Member

    Location:
    Valley City,OH
    Thanks for posting this. You just solved the mystery of why all of the fastens on my carbs are stripped out. Wish I knew this 25yrs ago.
     
  5. hershey

    hershey PR Elite

    Location:
    Ozone Layer
    Racing Number:
    01
    I always just used a #1 phillips bit without any issues. Nice to know you can get the proper tool though! Didnt know it was a special size.
     
  6. C Hudak

    C Hudak PR Addict

    Location:
    Lordstown, OH
    Racing Number:
    2
    Interesting for sure. I always broke the carb screws loose with safety wire pliers before using a screwdriver
     
  7. chubakka

    chubakka PR Member

    Location:
    Earth
    Racing Number:
    977
    Thank you for the advice. I have had this issue in the past but never attributed it to using the wrong tool. I still have my impact driver from working on my 1968 Bridgestone 100. LOL .
     
    1foxracing likes this.
  8. flyin polack

    flyin polack PR Addict

    Location:
    Wilmot, Ohio
    Racing Number:
    48
    I had a pair of these 2-3 years ago. They feel like they "snap" in the head of the screw and bite like crazy. No more stripped screws for me. Low and behold...the main one I use is missing from the tool box :-(
     
  9. 1foxracing

    1foxracing PR Addict

    Location:
    Midvale
    Racing Number:
    Photo Grunt
    MX955 and flyin polack like this.
  10. NQ1965

    NQ1965 PR Elite

    Location:
    Heath, Ohio
    Good Information, thanks for the post on this.

    I just ordered the Hozan JIS-5 set tonight.
    I really like the Vessel impact screwdrivers as well, have to add a set of those to my Get-List.

    I also spent a fair amount of time hunting for a set of JIS driver bits for my hand impact tool. I had a lot more difficulty with that. There are plenty of offerings of JIS bits that are 1/4" shank, but the impact driver uses a 5/16"or 8mm shank bit. I'm always cautious buying internationally but I did find a set of three 5/16 JIS driver bits on ebay from a seller in France. I used Paypal for the transaction. Nobody stateside even offered them.
     
    Last edited: Dec 5, 2017
  11. k01

    k01 PR Elite

    2017-12-05 18.25.04.png
    Ever use these?
     

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