Ktm SX 65 not Running well up top

I just rebuilt my sons 08 SX 65, new top and bottom end. When the bike reaches the top end it starts to cough and struggle.

I've just had it in the shop and they couldn't fix the problem either.

I've tried new fuel, new spark plug, repacked the pipe, reset float, tried changing jets, ran it without an end can, checked the engine timing and tried a different CDI unit.

Nothing seams to fix the problem???????

Please help if you can.

Cheers

Ray

Ignition coil possibly?  Or, the plug wire and boot?

I'll try that, Thanks.

I'm just about to swap the whole top end with another bike I have which is exactly the same. 

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