Originally posted by Truespode
The statement that it won't start is pretty inflamatory as it is describing an absolute
I didn't mean it that way. I was speaking theoretically. Kind of like the "If a tree falls in the forrest" thing. Maybe I'm just not getting it, but having the CDI know what your idle is set at
before the bike is even running is kind of like running into the forrest to see if the tree did make a sound, thus unqualifying the original question.
Yes, once the engine starts turning, there are electrical signals going to the CDI. But, at that initial firing, the engine speed is not up to the idle speed yet, so how does the CDI know to continue to let the bike run? That was the gist of my original post.
Plus there are many factors that would influence what the idle speed will be that the CDI would not have an input from, such as the jetting, fuel screw position and idle screw position.
I'm not dismissing any of the original quote you posted, I just have these questions as to
how the CDI processes the info it gets. Mainly, if it won't let it run unless the idle is , say, 1700 rpm, what lets the engine
continue to run until it reaches that speed of 1700 rpm?:think
Isn't that why there are wires running to the carb? To operate the accel pump and communicate with the bikes ignition system? Remember the grey wire and how it effects the ignition of the bike?
To my knowlede, the wires running to the carb are for the throttle position sensor. I'm straining hard here, but I believe the gray wire deals with the ignition timing (relative to the piston's position in the cylinder) I will research this more to see if I can find out exactly what it does. I thought that the gray wire kept the ignition timeing somewhat retarded even at high rpms.I thought that was a WR-only issue, also? I think the accelerator pump is mechanical. I'll have to verify.
The rpm's would have an input to the CDI as would the position of the throttle via the TPS, the gray wire would enable/disable ignition timing advancment/retardation based upon these inputs. Yes? No? Maybe? Time to do some reading.