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Author Message   Alessio66xb12r Posted on Friday, September 14, 2007 - 05:13 pm:        question : are the valves springs on xb9 and xb12 the same ? this is my point, if an xb9 can easy run at 7250 rpm and some more can a modified xb12 with stock cams and roller rocker arms run at 7000 without changing the valves spring ? bye Alessio   Steveshakeshaft Posted on Saturday, September 15, 2007 - 04:06 am:        I run >04 XL heads with XB valves and springs on my '97 M2 with the rev limiter set to 7000. No troubles so far, AFAIK the springs/valves are the same on 9 & 12.   Steveshakeshaft Posted on Saturday, September 15, 2007 - 04:11 am:        I fitted these parts- valve spring (4 needed) 18245-02 upper collar (4 needed) 18258-02 valve keeper (8 needed) 18260-02 lower collar/stem seal: (4 needed) 18094-02 intake valve: (2 needed) 18690-02 exhaust valve: (2 needed) 18691-02 To these heads- >04 sportster rear head (black) 16666-04 >04 sportster front head (black) 16667-04 HTH.   Alessio66xb12r Posted on Friday, September 21, 2007 - 08:01 am:        THANK YOU BYE ALESSIO   Steveshakeshaft Posted on Friday, September 21, 2007 - 12:21 pm:        Alessio, you are welcome.

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