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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine teardown after 90k miles
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<blockquote data-quote="Fred W" data-source="post: 1352310" data-attributes="member: 3828"><p>From a theoretical standpoint, it should. The need for valve adjustments on a modern overhead cam, shim under bucket motorcycle engine like the FJRs is primarily required by wear at the valve face to valve seat interface, and that wear is due to the repetitive impact of the valves in their seats. Since at higher rpm operation the valves will seat more times per minute, and per mile, it isn't much of a stretch to deduct that the valves will wear faster per mile and require adjustment at a lower mileage.</p><p></p><p>However, valve wear, and the need for adjustment is not a big problem for these engines, regardless of how hard they are ridden. The reports from high mile FJR owners is that they may have had to adjust the valves once or twice in hundreds of thousands of miles. I really do not see the need to ride the bike like an old lady just to try to avoid having to adjust the valves a couple of times in that distance.</p></blockquote><p></p>
[QUOTE="Fred W, post: 1352310, member: 3828"] From a theoretical standpoint, it should. The need for valve adjustments on a modern overhead cam, shim under bucket motorcycle engine like the FJRs is primarily required by wear at the valve face to valve seat interface, and that wear is due to the repetitive impact of the valves in their seats. Since at higher rpm operation the valves will seat more times per minute, and per mile, it isn't much of a stretch to deduct that the valves will wear faster per mile and require adjustment at a lower mileage. However, valve wear, and the need for adjustment is not a big problem for these engines, regardless of how hard they are ridden. The reports from high mile FJR owners is that they may have had to adjust the valves once or twice in hundreds of thousands of miles. I really do not see the need to ride the bike like an old lady just to try to avoid having to adjust the valves a couple of times in that distance. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Engine teardown after 90k miles
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