Bike won't idle properly or rev

[montmil]

If you still have the original coil, inspect it very closely for hairline cracks. Check the ends of the coil. A strong flashlight and a magnifying glass may be helpful.

If you find any cracks at all, Rick Jones is the go-to guy for a Dyna coil. Have them on both my R65s.

Monte

[Bob_Roller]

Your primary resistance is a bit low, my last OEM coil had .7 ohms for the primary, bike ran alright, but developed a hard starting issue at around 55 F.

[plc]

Hi Guys,

I tested the ICU by flicking the kill switch on and off, there is a spark at both plugs. Then I took off the bean can and rotated it, a spark appears but there is one at each plug per turn. Then I put a multimeter between the green trigger wire and the earth and then the voltage goes from low to 3.7 volts. That seems low to me, I thought it was meant to go to at least 9 volts.

The spark also seems inconsistent at times when I spin the bean can unit, is speed important or should it always trigger a spark?

Paul

[nhmaf]

It should trigger a spark on each full rotation.  Both plugs will spark together even though one side will be going on the exhaust stroke - that is why it is called a wasted spark system - by design.

I don't recall if the voltage should go up higher or not - can't recall last time I measured the output, but it is important that the output pulse go low and high on each rotation.

[Bob_Roller]

The electrical pulse from the hall sensor, is just an input to the ICU, the ICU then takes the signal, and amplifies it to what ever is required to 'fire' the coil.

The fact that the voltage goes from low or zero, to a higher voltage means it's working.

Problem is, there is a possibility that vibration and heat may be the culprit causing an intermittent operation.

[plc]

Should the drive part of the bean can that connects to the camshaft have movement? Mine has slight movement for and aft and it can me made to wobble side to side.

Paul

[plc]

OK Guys,

I tested voltage as the Clymer manual describes. Voltage at coils OK. Voltage at ICU not there, pulled out wire 5 and then tested current between pin 4 and the wire, reading was 1.2 mA, which according to Clymer manual means faulty trigger unit.

Interestingly my ICU did not have a wire to pin 7, yet I have read that is the tacho pick-up, so now I am puzzled how the tacho gets its signal, because it works, although I suspected it was reading slow.

Paul

[montmil]

Should the drive part of the bean can that connects to the camshaft have movement? Mine has slight movement for and aft and it can me made to wobble side to side.

Paul

Yes. Note also the light spring that is a part of the bean can drive coupling. A little designed-in movement permits the drive lug to self-center on the cam shaft end. No worries.   Monte

[Bob_Roller]

Pin number 8 should be the tachometer signal out of the ICU.

[plc]

Hi All,

Well my bike is running again now that i have fitted a new Ignition Trigger unit (Bean Can), even buying from Motobins it was pricey but I bought other things as well and including shipping it was cheaper than buying a new Bean Can in Australia.

I will now service the old one so I have a spare, hopefully the new one will last 25 years like the old one.

I just thought I would let everyone know it was the bean can so if you have a bike that won't rev or idle smoothly it may be a bean can like mine was. of course as I discovered it could be other things too.

Best wishes to all,
Paul