05 Yz450 Fading spark

I have a mate who just recently bought a 05 450. The bike never sparked from day one and he picked it up for a good deal. Innitially he thought it was the CDI and bought a Athena CDI for the bike. With that fitted, the bike is sparking, but the spark fades after the 3rd kick from normal spark to almost nothing.

If the bike is left for a while and tried again, the same scenario happens.

Any ideas?

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