| Author | Message | ||
     Bebop |
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? | ||
| Hughlysses |
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. | ||
| Clutchless |
"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) | ||
| Alex |
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. | ||
| M1combat |
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. | ||
| Clutchless |
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) |
