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  #1  
Old 13th May 2009
san1sjd san1sjd is offline
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Smile big bore kit with xb9 lower

What kinda of hp could i expect with 3 13/16 pistons and a lower from xb9. This would be like xbrr but mine would be carb. Stage 3 xb heads as well.
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Old 17th May 2009
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You are not providing very much info.
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  #3  
Old 17th May 2009
san1sjd san1sjd is offline
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Sorry but I have a 2002 m2 cyclone with 10.0 cr and thunderstom heads I want to put a xb9 lower unit so it will rev faster and higher. But need some opinions.
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Old 19th May 2009
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It would be hard to predict hp without more specific info like what cam, what exhaust, and what carb. Having said that, unless you were racing in a class that limited displacement, I think you would be better off with the stock stroke. The thing will make more power, lower in the powerband. The engine will not live long if it spends most of its life above 7000. The skirts on the pistons of the big bore Sportsters have to be pretty short to clear each other at bottom dead center and the faster you spin them the sooner you will be replacing them no matter how fast you can spin it before the rods fly out the bottom.
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Old 23rd March 2011
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Maru, I second that !!!!
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Old 23rd March 2011
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Do the XB engines bolt up to the old tuber Buells?
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Old 23rd March 2011
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Quote:
Originally Posted by Mattbastard View Post
Do the XB engines bolt up to the old tuber Buells?
No
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Old 24th March 2011
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Not only that, but the crank won't fit in a tuber engine. You'd be better off to get a custom short stroke crank made.

Less displacement won't rev up faster, all else being equal. Exactly the opposite is true in fact.

We've done 3-13/16 top ends on XB9's. It comes out to 1170cc. They run good but they don't keep up with the 88 inchers.
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