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Buell Motorcycle Forum » XBoard » Buell XBoard Archives » Archive through January 23, 2008 » 2008 Increased Redline « Previous Next »

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Bebop
Posted on Tuesday, January 22, 2008 - 01:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I was at the dealership and confirmed a suspicion. I checked a 2008 XB9SX and discovered that the redline was still 7500RPM. Did the 9 not get the improved/larger crankpin? I would have assumed that since the 12's redline was moved up, then so to would the 9's. Does anyone know the reason for this? I asked a tech but got only confused looks.

Also, looking back at most dyno charts of stock Buells, hp is usually still climbing at redline. I wonder if the extra rpms free up a couple of extra ponies. Has anyone put their 08 on a dyno?
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Hughlysses
Posted on Tuesday, January 22, 2008 - 06:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

From the document "2008 Buell Technical Forum" that details all the minute changes in the new models, it says the following in reference to updated pistons for the 2008 Buells:

• 984cc-7500 rpm redline (no change)
• 7100 rpm sustained
(was 7000 rpm)

So, the absolute redline for the 9 is unchanged, but the lower RPM limit on the two-stage rev limiter has been upped by 100 RPM.
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Clutchless
Posted on Tuesday, January 22, 2008 - 09:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

"I asked a tech but got only confused looks."


LMFAO, you and me both.

too bad I'm an H-D tech...I would smack that guy for not answering you.



P.S. sorry I didnt even try to answer your ?

I'm not 100% but I'm pretty sure it has something to do with the new oil system. or timeing.

(Message edited by clutchless on January 22, 2008)
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Alex
Posted on Tuesday, January 22, 2008 - 10:18 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Maybe 7500 rpm is what they consider safe for the valve train. So the upgraded crank has only an advantage for the XB12 when speaking of red line.
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M1combat
Posted on Tuesday, January 22, 2008 - 05:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

the new crank has a larger crank journal. That allows a beefier big end on the front conrod. That allows a higher rev limit. The old ones tend to stretch the big end a little bit and you hear a hammering.


I did my research (I even heard the sound...) and am in the process of putting the '08 crank in my '04.

It also requires a new bearing on the left side, a new front primary sprocket and a new nut for said sprocket.
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Clutchless
Posted on Tuesday, January 22, 2008 - 06:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I'm going with m1combat on this one.

after I read around because this thread made me curious.

anyone ever had a crank-pin fail in their bike that wasnt under race application? I.E. never went to track days with it?

(Message edited by clutchless on January 22, 2008)
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