Motorcycle Questions? Ask a Mechanic.
You likely have a dirty or bad crank position sensor. The sensor is located down on the forward left side of the crankcase near the end of the oil filter.
First, remove the single retaining bolt and gently twist and pull the sensor out of the case hole. Clean off any metal debris on the end of the sensor as it can interrupt the generator of the fire signal. Re-install the senor.
To test it you set your meter to the AC setting. Connect your leads to the two wires leading from the sensor. With your leads connected you should see 1 to 3 volts AC depending on cranking speed.
I hope this helps. Please let me know if I can be of further assistance. Also, please leave a positive rating for my service today. Thanks, P.J.
And you still see no spark at plugs?
The intermittent voltage at the coil is the issue. We just need to figure out why it is happening.
Let me find a schematic.
Check to verify you have continuous power on the blue/gray wire leading into the system relay.
The yellow/green at the coil is the only wire you should see power on. It should get power for a brief time when the ignition is first switched on. It will have power as long as you hear the fuel pump.
Just going back through your initial information. The increasing idle leads me to believe that the idle air control may have an issue. It supplies 100% of your idle air. If it doesn't step to the correct setting the bike will not start.
Try cracking the throttle slightly while you crank the bike. If it fires then you know you need a new idle air control solenoid.
Do you have a security system?
Also, check that all grounds on the two bolts under the seat are properly connected to the frame and that there isn't any corrosion.
Sounds good. Keep me posted. Thanks, P.J.
Primary resistance (pins C yellow/blue to D blue/orange) should be 0.5 to 0.7 Ohms
Secondary (plug wire tower to plug wire tower) resistance should be 5500 to 7500 Ohms