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FJR Motorcycle Forums
Technical & Mechanical Problems
Big SHOUT OUT to Yamaha
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<blockquote data-quote="MCRIDER007" data-source="post: 1032575" data-attributes="member: 329"><p>I don't think ionbeam gave the correct answer....just the "workaround" solution that Yamaha came up. The tick was caused by excessive heat buildup in the exhaust valve guides which lead to premature wear in those guides but Yamaha never disclosed the actual cause of the excessive heat. Jestal had a very comprehensive post that listed a half dozen possible causes of the excessive heat and speculated that 2 or more of those causes probably were in play at the same time in the engines that developed the tick. Valve guide seals are not supposed to allow any oil flow to the valve stems and if the tight seals were the cause of the excessive heat then every engine would have developed the tick.</p><p></p><p>Yamaha's solution was to cool the valve stems by allowing a small amount of oil to flow past the stem seals, which essentially ignored the root cause of the problem but turned out to be very effective.</p></blockquote><p></p>
[QUOTE="MCRIDER007, post: 1032575, member: 329"] I don't think ionbeam gave the correct answer....just the "workaround" solution that Yamaha came up. The tick was caused by excessive heat buildup in the exhaust valve guides which lead to premature wear in those guides but Yamaha never disclosed the actual cause of the excessive heat. Jestal had a very comprehensive post that listed a half dozen possible causes of the excessive heat and speculated that 2 or more of those causes probably were in play at the same time in the engines that developed the tick. Valve guide seals are not supposed to allow any oil flow to the valve stems and if the tight seals were the cause of the excessive heat then every engine would have developed the tick. Yamaha's solution was to cool the valve stems by allowing a small amount of oil to flow past the stem seals, which essentially ignored the root cause of the problem but turned out to be very effective. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Big SHOUT OUT to Yamaha
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