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FJR Motorcycle Forums
Technical & Mechanical Problems
2006 Front caliper mounting bolts
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<blockquote data-quote="FJReady" data-source="post: 1326263" data-attributes="member: 465"><p>I'm postulating that the bolt is hollow to reduce unsprung weight. Probably not that important on this bike but Yamaha likes to use common parts across their fleet and I'm guessing that this is used on many Yamaha models including the sportier ones where weight is a bigger factor.</p><p></p><p>I wouldn't hesitate to use a solid bolt in its place provided that it is of comparable strength. I expect this is a high strength bolt, at least 10.9 grade.</p><p></p><p>If it can take the specified assembly torque, it is probably OK. Speaking of torque, how did you break the OEM bolt? Tightening or loosening? If it was tightening you may want to check your torque wrench. I've had my gen 1 caliper off and on at least a dozen times. No trouble breaking the bolts. Those are pretty beefy (very important too) fasteners. Something was screwy if you broke them. Determine root cause before you finish the reassembly.</p></blockquote><p></p>
[QUOTE="FJReady, post: 1326263, member: 465"] I'm postulating that the bolt is hollow to reduce unsprung weight. Probably not that important on this bike but Yamaha likes to use common parts across their fleet and I'm guessing that this is used on many Yamaha models including the sportier ones where weight is a bigger factor. I wouldn't hesitate to use a solid bolt in its place provided that it is of comparable strength. I expect this is a high strength bolt, at least 10.9 grade. If it can take the specified assembly torque, it is probably OK. Speaking of torque, how did you break the OEM bolt? Tightening or loosening? If it was tightening you may want to check your torque wrench. I've had my gen 1 caliper off and on at least a dozen times. No trouble breaking the bolts. Those are pretty beefy (very important too) fasteners. Something was screwy if you broke them. Determine root cause before you finish the reassembly. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
2006 Front caliper mounting bolts
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