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FJR Motorcycle Forums
Technical & Mechanical Problems
26,000 mile Valve Adjustment
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<blockquote data-quote="HaulinAshe" data-source="post: 199408" data-attributes="member: 1875"><p>My experience has been that the valves closest to the cam sprocket tend to settle slightly tight. It makes sense when you consider that the cam chain tends to pull the camshaft downward toward the valve. Any wear tolerance that results causes the drive-side valves to be slightly tighter.</p><p></p><p>It's also been my experience that once the initial "settling" occurs, the valves stay in spec for many, many hours thereafter. Yamaha really has their act together on hi-perf 4-stroke valve systems.</p><p></p><p>Curious, did you note any visible timing change due to stretch of the chain? Again my experience, has been that performance slips slightly as normal chain wear kicks in. Since the timing relationship between exhaust and intake is strictly controlled by the integrity of the chain, when the chain wears even a tiny bit, it can cause a 1-3 degree shift in cam timing.</p><p></p><p>On racing bikes I tend to replace the cam chain much more frequently than recommended by Yami. But I'm not racing my FJR. Just wondering if anyone else has experience with cam chain wear.</p><p></p><p>Thanks for sharing your valve experience. I'm about 3,000 miles behind you.</p></blockquote><p></p>
[QUOTE="HaulinAshe, post: 199408, member: 1875"] My experience has been that the valves closest to the cam sprocket tend to settle slightly tight. It makes sense when you consider that the cam chain tends to pull the camshaft downward toward the valve. Any wear tolerance that results causes the drive-side valves to be slightly tighter. It's also been my experience that once the initial "settling" occurs, the valves stay in spec for many, many hours thereafter. Yamaha really has their act together on hi-perf 4-stroke valve systems. Curious, did you note any visible timing change due to stretch of the chain? Again my experience, has been that performance slips slightly as normal chain wear kicks in. Since the timing relationship between exhaust and intake is strictly controlled by the integrity of the chain, when the chain wears even a tiny bit, it can cause a 1-3 degree shift in cam timing. On racing bikes I tend to replace the cam chain much more frequently than recommended by Yami. But I'm not racing my FJR. Just wondering if anyone else has experience with cam chain wear. Thanks for sharing your valve experience. I'm about 3,000 miles behind you. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
26,000 mile Valve Adjustment
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