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FJR Motorcycle Forums
Technical & Mechanical Problems
Ignition Timing Curves
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<blockquote data-quote="garyahouse" data-source="post: 1192444" data-attributes="member: 20946"><p>Copied from a PM reply sent to me by the OP of this thread. I contacted him to encourage him to keep us informed about putting a cam in his FJR.</p><p></p><p><strong>"...Probably the reason folks don't do the cam mod is because it's not cheap and doesn't yield astronomical gains. In the case of a street FJR with it's high gear ratio you can't add much more than about 12-16 degrees more cam timing without killing the bottom end.</strong></p><p><strong></strong></p><p><strong> The profile I outlined fetches slightly less power below 3000 rpm, about the same from 3000-4000 and 5-8 more from 5000 up with a power curve stretching to 9500 with the stock springs.</strong></p><p><strong> The FJR has single valve springs with no inner spring, so even though it employs the shim under style buckets its RPMs are limited with the stock springs, especially with a more evil cam.</strong></p><p><strong> It's valve springs have practically the same pressure as the outer springs on a V-Max. But the Max has an inner spring as well and utilizes the heavy shim on top style buckets.</strong></p><p><strong></strong></p><p><strong> Anyway, a motor is a motor and a cam is a cam and Web cams was grinding cams since before I knew what a cam was and that is a long time if you know what I mean."</strong></p><p><strong></strong></p><p><strong> Dan</strong></p></blockquote><p></p>
[QUOTE="garyahouse, post: 1192444, member: 20946"] Copied from a PM reply sent to me by the OP of this thread. I contacted him to encourage him to keep us informed about putting a cam in his FJR. [B]"...Probably the reason folks don't do the cam mod is because it's not cheap and doesn't yield astronomical gains. In the case of a street FJR with it's high gear ratio you can't add much more than about 12-16 degrees more cam timing without killing the bottom end. The profile I outlined fetches slightly less power below 3000 rpm, about the same from 3000-4000 and 5-8 more from 5000 up with a power curve stretching to 9500 with the stock springs. The FJR has single valve springs with no inner spring, so even though it employs the shim under style buckets its RPMs are limited with the stock springs, especially with a more evil cam. It's valve springs have practically the same pressure as the outer springs on a V-Max. But the Max has an inner spring as well and utilizes the heavy shim on top style buckets. Anyway, a motor is a motor and a cam is a cam and Web cams was grinding cams since before I knew what a cam was and that is a long time if you know what I mean." Dan[/B] [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Ignition Timing Curves
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