czaszi Posted July 24, 2015 Share Posted July 24, 2015 Hi, I recently bought my VFR and noticed following thing - rpm at idle are moving slightly down and up +/- 300 rpm; that happens regardless of engine temperature. When engine is warm RPM if held at certain level (2k for example) will fall down and after a second or two get back up. I haven't started any electrical diagnosis yet on this but will later today. Anyone experienced such behaviour on their VFR? I am attaching two videos that I recorded. One shows RPM held constantly at 2k just after arriving at work. Second one is after engine cooled down a bit and shows RPM held at 2k then idle then my poor attempt to hold it at slightly higher revs. Bike has Power Commander III installed and gutted exhaust. Shop I bought it from told me that they did full service - fluids, pads, valves. I was told that the bike was unused for some time and was standing outside (Irish weather does not really help) 2K rpm hold 2K rpm hold, idle, then hold at 4250 rpm Link to comment Share on other sites More sharing options...
Member Contributer Switchblade Posted July 24, 2015 Member Contributer Share Posted July 24, 2015 It's a common problem,the un-controllable throttle from idle to about 4000rpm, some have reset the stater valves and solved it and for some it has not help . Link to comment Share on other sites More sharing options...
Member Contributer paulmeisterpk Posted July 24, 2015 Member Contributer Share Posted July 24, 2015 I would do a starter valve sync first before going much further, that helped my bike a ton. Check and make sure your air filter is clean while you're in there too. Link to comment Share on other sites More sharing options...
czaszi Posted July 24, 2015 Author Share Posted July 24, 2015 Super. Thanks for the reply. Will check it and update thread once done. Link to comment Share on other sites More sharing options...
czaszi Posted July 30, 2015 Author Share Posted July 30, 2015 I haven't touched starter valves yet but is it possible that this mihgt be power commander related issue? Link to comment Share on other sites More sharing options...
Member Contributer Switchblade Posted July 30, 2015 Member Contributer Share Posted July 30, 2015 My PC5 has losts its program twice . Link to comment Share on other sites More sharing options...
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