300 cdi?

[motopsycho87]

Got a feeling my RM125 CDI is biting the dust, similar acting to when the 300 one died. Seems to hit a certain RPM then cough and sputter like hell;

I've gone up and down 2 main jet sizes to eliminate jetting. (170, 174, 178)

I've changed the HT coil, no change (though the old one was damaged)

2 years ago I replaced the stator coil with an electrex model, this didn't fix the problem before, I also coated the IGN coil with silicon to ensure no water ingress.

Can anyone tell me the earth points on this bike?

Obviously the RM125 CDI was second hand, and due to 125's being so high revving I'm wondering if it was already deteriorating at a higher RPM than the 300 can achieve, and has perhaps deteriorated further?

Where is a good place to pick up CDI's from?
http://www.ebay.co.uk/itm/CDI-ECU-Ga...item4d2625b1d8 ????