Both cylinder's were within a couple of psi of 130, a check was made hot (when sluggish) and also when cold with little difference.
No knock's, rattles or misfires etc motor seem's sweet.
Seem's stock jetting, stock exhaust, some porting has been carried out, plug's a good colour, power valves working.
Good battery, charging system 13.5 to 14.9 (only at tickover)
I believe the PGM may have been recon'd at some point, took the base off for a peek, like new visually.....
Like I say this only happen's some time's, tend's to get worse the longer it's run, and tend's to be ok for quite a while after the temp gauge is up to temp @ 65' ish.
I'm baffled, still working on the idea of an intermittent electrical problem, problem seem's most exaggerated between 5500 and 8500 rpm.
Any idea's.
thanx, Regard's Phil