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  #11  
Old 23rd March 2007
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xb9 and xb12 are the same bore, putting a 9r crank in a 12r would get you a 9r. Sorry to burst your bubble.
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  #12  
Old 23rd March 2007
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Are the heads between the two different xb bikes the same. Valve sizes the same between the two xb bikes.
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  #13  
Old 25th March 2007
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Quote:
Originally Posted by citified View Post
xb9 and xb12 are the same bore, putting a 9r crank in a 12r would get you a 9r. Sorry to burst your bubble.
Read my first post again. I want to put in the shorter stroke 9 crank with the big-bore cylinders. Hence "short stroke with big bore".

No bubbles bursted.

Quote:
Originally Posted by rottenralph View Post
Are the heads between the two different xb bikes the same. Valve sizes the same between the two xb bikes.
Heads are identical between the 2 engines.
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  #14  
Old 26th March 2007
2003xb9R
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Well I got at 2003 xb9r and want to put a 12 crank in it, do u want to just swap engines and ecm's lol?

Last edited by 2003xb9R; 26th March 2007 at 22:32..
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  #15  
Old 30th March 2007
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Quote:
Originally Posted by xl1200r View Post
Read my first post again. I want to put in the shorter stroke 9 crank with the big-bore cylinders. Hence "short stroke with big bore".

No bubbles bursted.



Heads are identical between the 2 engines.


sorry, I thought wrong. I too would like to do the 1050 kit, some day, After I blow it up anyway
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  #16  
Old 7th April 2007
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Quote:
Originally Posted by citified View Post
sorry, I thought wrong. I too would like to do the 1050 kit, some day, After I blow it up anyway
Kind of my boat - part of me wants an excuse to have to tear the whole thing down.
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  #17  
Old 7th April 2007
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I considered that build also, but most of the professional builders I talked to, said the valve train is the limiting factor. To reach the HP levels you want would take reving the hell out of it.
Even so it would be cool to get a HD motor to rev like a NASCAR motor.
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  #18  
Old 6th January 2008
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I know guys from the Hillbilly-racing-team here in Germany combined an XB9 crank with a big bore set from Millenium tech. It turned out to be an 1170 cc "short-attack" bike with 100+ rwhp. Anyway I would guess 120+ rwhp out of 1200 cc is not good for all-around street-use.
I got these numbers from a 1430 cc = 87 ci square engine with radical cams and 11:1 CR.

Martin
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  #19  
Old 22nd April 2009
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If you had heads and ECM to support it, it would make a good race motor for AHRMA Pro twins formula 2.
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