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Thread: To bore, and how much?

  1. #11
    Super Moderator ancientdad's Avatar
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    Quote Originally Posted by tbpmusic View Post
    If you bore fore displacement, that limits your future - if you ever need another bore you're screwed. Largest I ever saw was 12'th over (3mm) - if your 12'th over fails you'll need new sleeves.
    Otherwise, just bore enough to clean the cylinders up, leave yourself some headroom in the future.
    Bill, you did see my post above, right? I've done S-16 (with high compression) twice with great long-term reliability. Granted, it's at the end and if anything happens you need new sleeves or a good used cylinder, but it's more reliable than people give it credit for as long as you don't do dumb stuff that you shouldn't do anyway, like idling in summer heat for a long time, it's fine for a very long time. It doesn't get much hotter than Barber last October and my bike did just fine running around the grounds all week long, including in the very increased traffic from Friday on when the public came in droves
    Tom

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  2. #12
    Senior Member tbpmusic's Avatar
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    Quote Originally Posted by ancientdad View Post
    Bill, you did see my post above, right? I've done S-16 (with high compression) twice with great long-term reliability. Granted, it's at the end and if anything happens you need new sleeves or a good used cylinder, but it's more reliable than people give it credit for as long as you don't do dumb stuff that you shouldn't do anyway, like idling in summer heat for a long time, it's fine for a very long time. It doesn't get much hotter than Barber last October and my bike did just fine running around the grounds all week long, including in the very increased traffic from Friday on when the public came in droves
    Like I said above, I've never personally seen anything bigger than 12 - I'm not doubting the existence, just the rarity........
    And again, if you blow out those 16's, those sleeves are probably done for.
    Bill Lane
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    No advice, just info

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  3. #13
    Supporting Member Yendor's Avatar
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    The best answer to the question in your title is:

    ONLY YOUR MACHINIST KNOWS - Unless you own a Bore Gauge and have the skills to read it.

    Let them tell you how much has to be removed.

    Again like already said - Unless you are going for Max Size... but REALLY... These motors are already pretty much as tricked out for performance as needed for Street purposes.
    If you really need that much Speed/Performance you should be looking at a bigger bike.
    krukster86 likes this.
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