The head bolts are torque to yield bolts, meaning that they are stretched to near the point of breaking. This is done when putting the additional angle on the bolts. However, on my build, with a 14:1 piston, I reused the stock bolts because I was short on time and the local dealer didn't have any in stock. They may be good for one or two rebuilds, but it's always a good idea to replace them just in case.
2009 Yamaha R1
156 rwhp - 76 rwtq
Leo Vince factory carbon/carbon 3/4 system, DynoJet PCV + dynotune, K&N "race" filter, Euro airbox mod, AIS delete, Watsen signals, Custom LED tail light, DDM 55W 6000K HID's, Scorpio SR-i900
R1 Raptor 1000 Project Bike - In Progress
'01 Raptor 660 frame, subframe, and suspension, '06 YZF-R1 rebuilt motor
2006 YFZ450 Dune/Drag - Sold
2005 Buell XB12Scg 1203cc - Sold
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