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FJR Motorcycle Forums
Technical & Mechanical Problems
Further details on Fast Idle system
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<blockquote data-quote="wfooshee" data-source="post: 643513" data-attributes="member: 6354"><p>Just a note about the throttle bodies and crud on the plates. The lack of such gunk upstream in the breather system may or may not mean anything. None of it means much to me. I was just thinking and comparing to automotive systems, and in a car, you have the throttle at the beginning of an air intake plenum, and PCV goes into that plenum, behind the throttle. In our engine, the throttle is the last thing any air or other molecule sees before it goes past the injector into the intake valve, and there's no space in that short distance to handle crankcase ventilation, so it dumps into the airbox.</p><p></p><p>Mine didn't look that bad first time I took the throttle bodies off last spring, and after cleaning them they were still pretty clean a couple weeks ago with the starter issues. But on mine the crud was just on the plates. I had none on the aluminum throats of the throttle bodies, it seemed to condense and collect just on the throttle plates. Similar to yours, nothing at all in the airbox itself.</p><p></p><p>Don't know that it means anything, just a comparitive observation.</p></blockquote><p></p>
[QUOTE="wfooshee, post: 643513, member: 6354"] Just a note about the throttle bodies and crud on the plates. The lack of such gunk upstream in the breather system may or may not mean anything. None of it means much to me. I was just thinking and comparing to automotive systems, and in a car, you have the throttle at the beginning of an air intake plenum, and PCV goes into that plenum, behind the throttle. In our engine, the throttle is the last thing any air or other molecule sees before it goes past the injector into the intake valve, and there's no space in that short distance to handle crankcase ventilation, so it dumps into the airbox. Mine didn't look that bad first time I took the throttle bodies off last spring, and after cleaning them they were still pretty clean a couple weeks ago with the starter issues. But on mine the crud was just on the plates. I had none on the aluminum throats of the throttle bodies, it seemed to condense and collect just on the throttle plates. Similar to yours, nothing at all in the airbox itself. Don't know that it means anything, just a comparitive observation. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Further details on Fast Idle system
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