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FJR Motorcycle Forums
Technical & Mechanical Problems
Misfire at steady cruise
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<blockquote data-quote="ionbeam" data-source="post: 990416" data-attributes="member: 277"><p>I wasn't saying the voltage was low, I was hinting that the connection was intermittent. Acceleration and deceleration are dynamic conditions where engine inertia can hide little problems, whereas a steady throttle will let you feel the hick-ups. As you point out, there doesn't seem to be a pattern to the glitches. Everything is in play, including loose battery terminals (need to go back and see if you checked one of the first things first). They way the ignition switch failed (before the recall) could cause an intermittent problem.</p><p></p><p>Lean misfire will always cause an engine to run hot. What do the plugs look like? Check plug to plug color and overall plug color, if it is lean enough to misfire it will show in the plug color. If it is rich enough to misfire it will show in the plug color. What is the head pipe color and temperature? If the old plugs have a good color and the color is equal between the plugs you should be looking someplace other than a fuel problem.</p><p></p><p>An exhaust leak will cause that kind of a sound.</p><p></p><p>Does the tach flicker during the glitch?</p><p></p><p>Back to that local dyno....</p></blockquote><p></p>
[QUOTE="ionbeam, post: 990416, member: 277"] I wasn't saying the voltage was low, I was hinting that the connection was intermittent. Acceleration and deceleration are dynamic conditions where engine inertia can hide little problems, whereas a steady throttle will let you feel the hick-ups. As you point out, there doesn't seem to be a pattern to the glitches. Everything is in play, including loose battery terminals (need to go back and see if you checked one of the first things first). They way the ignition switch failed (before the recall) could cause an intermittent problem. Lean misfire will always cause an engine to run hot. What do the plugs look like? Check plug to plug color and overall plug color, if it is lean enough to misfire it will show in the plug color. If it is rich enough to misfire it will show in the plug color. What is the head pipe color and temperature? If the old plugs have a good color and the color is equal between the plugs you should be looking someplace other than a fuel problem. An exhaust leak will cause that kind of a sound. Does the tach flicker during the glitch? Back to that local dyno.... [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Misfire at steady cruise
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