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FJR Motorcycle Forums
Technical & Mechanical Problems
Low mpg and slight power degradation
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<blockquote data-quote="RichDoyle" data-source="post: 1181136" data-attributes="member: 84694"><p>This somewhat off the wall, perhaps, but it is something I've seen on both my ST1300s: A malfunctioning thermostat. Specifically stuck open or opening too soon. A drop in gas mileage was definitely one of the symptoms. Basically the bike didn't get fully warmed up and this presumably caused the FI system to run it richer than optimal. On the first bike the temperature routinely ran one "bar" lower than it normally did. On the second the temperature effect was even more obvious. The temperature would run one bar lower than normal generally, would sometimes get up to normal, and then drop as far as 2 bars below normal at highway speed. In both cases changing the thermostat eliminated the problem.</p><p></p><p>Running at high speeds might mask this behavior, but it might also make it irrelevant. But something to consider.</p></blockquote><p></p>
[QUOTE="RichDoyle, post: 1181136, member: 84694"] This somewhat off the wall, perhaps, but it is something I've seen on both my ST1300s: A malfunctioning thermostat. Specifically stuck open or opening too soon. A drop in gas mileage was definitely one of the symptoms. Basically the bike didn't get fully warmed up and this presumably caused the FI system to run it richer than optimal. On the first bike the temperature routinely ran one "bar" lower than it normally did. On the second the temperature effect was even more obvious. The temperature would run one bar lower than normal generally, would sometimes get up to normal, and then drop as far as 2 bars below normal at highway speed. In both cases changing the thermostat eliminated the problem. Running at high speeds might mask this behavior, but it might also make it irrelevant. But something to consider. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Low mpg and slight power degradation
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