What size JIS screws are on the TW?
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Thread: What size JIS screws are on the TW?

  1. #1
    Senior Member old white truck's Avatar
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    I see complaints about stripping the JIS “Phillips” case screws on TWs. I find this funny.



    80 zillion years ago when I was a kid and rode YZs we were always stripping case screws. We thought it was just because we were idiots or because Yamaha made cheap screws – at that time no one knew anything about JIS screws. Back then, we eventually learned the 3 accommodation tricks:

    - Impact driver (after decades I still have the original cheapie I bought back then and it still works)

    - Small cold chisel applied to the side of the screws for loosening

    - Replace with Allen head bolts



    We flash forward to the present day and I read that people with Yamahas still have this problem. How funny that Yamaha is still supplying those damn JIS screws.



    Anyway, now that I have a second chance to attack those b*stardly screws, I would like to do it right – just for fun.



    I have seen what look like decent JIS screwdrivers online (example). The question is what size JIS will I need for the case screws (#2 or #3)? And what size and length would I need for those on the carb?



    (I know I could just replace them with Allen screws but after all these years I want to conquer the Japanese and learn how to screw like a pro.)



    Thanks for any help.

  2. #2
    Senior Member pgilles's Avatar
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    Not sure what size JIS you need (I replaced them with allens so never worried about finding the correct JIS), but here is screw size and length: http://tw200forum.co...at-bowl-screws/
    Sold bike.



    Youtube vids of old TW's acceleration:

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  3. #3
    Senior Member PalmStateCrawler's Avatar
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    If your wife is happy, you don't need to "screw like a pro". Though there's definitely always room for improvement
    '13 690 Enduro R too many frickin farkles...
    '07 KLX250 farkled (wife's bike)
    '86 BW80 farkled to size
    '10 TW200 you will be missed

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  5. #4
    Senior Member elime's Avatar
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    Those screwdrivers are pricey! Does Harbor Freight have anything that can help?

    Next time I pull a side cover I am replacing those screws with flange bolts that have a regular six sided heads on them so I can use a socket.
    Long live the internal combustion engine!

  6. #5
    Senior Member pgilles's Avatar
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    Quote Originally Posted by Tony View Post
    Those screwdrivers are expensive! Maybe Harbor Freight can help.

    Next time I pull a side cover I am replacing those screws with flange bolts that have a regular six sided heads on them so I can use a socket.


    Make sure the socket can fit, it may interfere with the float bowl itself. That's the beauty of the allen style bolts, no concern for clearance.
    Sold bike.



    Youtube vids of old TW's acceleration:

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  7. #6
    Senior Member sethhoffman6984's Avatar
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    I can give you the bolt size: it's an M4 x .7 x 14mm



    Here is the link to the allen bolts I used: http://www.amazon.com/DrillSpot-M4-0...m4+x+.7+x+14mm



    You can also use 16mm bolts with a lock washer if you like.



    I really wouldn't bother with the JIS screws, it's more trouble that it's worth. But if you're hard set on it, I'm 90% sure they're #2 JIS.



    The other nice thing with allen bolts is you can take the bowl off without loosening the carb to change jets since you'll have a right-angle allen key.
    2009 CRF230F - 2013 TW200

  8. #7
    Senior Member Ayers Garage's Avatar
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    Most of the screws on the TW are #2 and #3 JIS. The carburetor screws are number 1. Those screwdrivers in your link are not expensive at all and are extremely high quality tools.



    I bought mine from McMaster Carr. Once you have the right JIS tools, your screw stripping days are over.



    Spoolmak 2.0 likes this.

  9. #8
    Senior Member old white truck's Avatar
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    Quote Originally Posted by Ayers Garage View Post
    Most of the screws on the TW are #2 and #3 JIS. The carburetor screws are number 1.


    Thank you Ayers Garage - that is just the info I was looking for!



    What length #1 screwdriver would you suggest for the carb screws?







    Thanks!

  10. #9
    Senior Member Ayers Garage's Avatar
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    Just a normal length driver. That's, what, 8 inches or so ? I personally hate stubby handle screwdrivers.



    My set shown in the picture above has worked for every screw I've ever run across on a lot of different Asian motorcycle restorations I've done over the years.

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