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  1. #1
    Chrisrokc's Avatar
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    Difference between 1300R Cylinders

    I noticed the middle cylinder has a different number on it than the outside two. Like two of them are Y2 and the middle is Y1 I think. Anyways is there really any difference besides the bolts on the outside?


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  3. #3
    Chrisrokc's Avatar
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    Ok so they are different sizes slightly? Does that matter? I have three of the same cylinder, I have the old cylinder so the swapping stuff over won't matter when it comes to bolting stuff up.

    Did mention the cylinders are going to get the 1390 treatment

  4. #4
    TRIPLE PIPES ARE 2-STROKE TURBOS allcool's Avatar
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    Quote Originally Posted by Chrisrokc View Post
    I noticed the middle cylinder has a different number on it than the outside two. Like two of them are Y2 and the middle is Y1 I think. Anyways is there really any difference besides the bolts on the outside?
    Y1, Y2 etc. on cyl sides are the cast in markings to denote one mold/ machining set up to to another.

    As osidebill explained to me the casting numbers/letters let them know what machine a piece came from so if there is a problem they can trace it back and know where to correct it. Bill explains it better, maybe he will chime in.

    Cyl size markings are stamped in not cast in because the size is only known after the casting is done and the diamond hone job is finished to size, then the finished bore size numbers can be stamped in. There are only numbers for the cyl size...no letters. The size stamp is located by the top deck next to the power valve


    allcool
    Last edited by allcool; 09-17-2007 at 09:29 PM.

  5. #5
    Chrisrokc's Avatar
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    Oh ok! Got ya on that!

    My numbers are 4 10 12 on the stock cylinders. 10 is the middle cylinder that was broken. It is replaced with a number 8. All cylinders show Y1 on them. They are going to get sent out for 1390 stuff soon so I guess those numbers won't mean much after that.

    Thanks for the info.

  6. #6
    Moderator OsideBill's Avatar
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    The Y1,Y2 etc numbers cast in the cylinders denote mold cavity used in production. I have even seen these in the head's. The other stamped numbers are put in each cylinder as they are inspected post of the honing process. The numbers on my BB were X'd out post of the BB work. So yes you are right they will not mean anything once the BB process starts.

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