Cbr250RK mc19 not sparking on cylinder 2 and 3 when cold.

[Suzuki]

Hey everyone.
My Cbr250RK mc19 is not sparking on cylinder 2 and 3 when the engine is cold. Once the engine starts to warm up, starts running on all 4 cylinders but misfiring on 2 and 3 sometimes. ( I Know this, as I have put the ignition light onto the HT leads.
The ignition on cylinder 1 and 4 is 100%.

I have tested the HT leads, the ignition coil for cylinder 2 and 3, pulse generator, voltage going into the coils and checked for any broken wiring in ignition system.
Readings I got from the pulse generator didn't match the service manual at cold ( below spec ), but once it warms up it goes ( above spec ).
Also the ac voltage coming for once pick up sensor on the pulse generator is 1.3V and the other is 2.0v. ( other pick up sensor is 3.0V all the time )
I haven't tested the C.D.I unit as I don't know a accurate way of testing it.

Does anyone have any ideas on what to test next or is the problem the pulse generator?

[Akzle]

my immediate thought was coils. but they tend to fail more when hot.

i think you're at the point of having to find known good parts to swap in.

congratualtions for doing all the right shit and not being a fucken muppet.

[Suzuki]

my immediate thought was coils. but they tend to fail more when hot.

i think you're at the point of having to find known good parts to swap in.

congratualtions for doing all the right shit and not being a fucken muppet.

Cheers mate for the reply, that was my first thought too, have tried swapping cylinder 2 and 3 ignition coil, but didn't make a difference.
Yea it seems like I might just have to start swapping parts to it works haha, not the best way of fixing it tho, as it starts to add up.

[OddDuck]

Nice work.

I'd check:

- compression
- inlet vacuum
- spark plug condition
- valve clearances
- pickup coil resistances, both cold and hot
- drain all carb bowls and check cleanliness of the fuel - grit, rust etc

Good luck!