hey all- i need your expert input- when I'm idling in traffic, my bike RPM downs on occasion and seems close to stalling. It rides fine and I always warm-up sufficiently (i think). It has 10K and had the 6K service last year. The bike is 03 M800Sie. What's the diagnosis?
what RPM is it normally at and what does it drop down to? I would reset your TPS and maybe raise the idle just a bit and see if that solves your problem. If you don't want to do the TPS reset, just raising the idle should, at the very least, mask your problem.
There are plenty of possibilities from electrical malfunctions to bad valve guides but the TPS/idle adjustment is the best place to start.
Quote from: woodyracing on May 17, 2009, 12:47:58 AM
what RPM is it normally at and what does it drop down to? I would reset your TPS and maybe raise the idle just a bit and see if that solves your problem. If you don't want to do the TPS reset, just raising the idle should, at the very least, mask your problem.
There are plenty of possibilities from electrical malfunctions to bad valve guides but the TPS/idle adjustment is the best place to start.
RPM usually rests around 1 and it makes this "shuddering" sound and drops half way below 1 and sounds like its going to cut out. Is resetting TPS something I need to take into the shop? (btw appreciate your comments)
its possible to do it yourself, you back the throttle stop screw out so that the butterfly valves on the throttle bodies can close completely and stick a multimeter on two pins on the ECU (pin #s depend on which ECU) or the TPS wires themselves checking for voltage. Loosen the bolts on the TPS and rotate as necessary to get a reading of 150mV, tighten the bolts and adjust the throttle stop to reach 1,200 RPM idle.
You can start by raising your idle to 1200 RPM via the throttle stop screw and see if it still gives you trouble, 1,000 is too low IMO.