Just been for a spin on the bike.
These thing's should be banned (oop's they have been!)

The connector on the black/yellow wire to the front coil was a bit manky, easy.
I snipped and stripped some new wire. The copper wire was Black to the core.
I got hold of some new black/yellow (bit bigger cross section tho), snipped the existing black/yellow from the PGM connector (with a view to soldering the new to existing wire), but there was still black tarnishing visible!

I had a real chew trying to remove the dinky little pin connector from the terminal block, I soldered the new wire directly to the pin connector and tried to refit.

Ha,ha yup the new heavier wire wouldn't now fit into the white multi connector for the PGM. Time for a bit of brute force and ignorance....

I tie wrapped the cable (in sheathing) to the existing harness to the front coil.

I've just been out (cold wet night, but hey I'm excited!)for 1 1/2 hour's.

The bike is transformed, the engine note alone being louder, crisper and more "zingy" (good!), the motor pulls strong with a satisfying build through 6,7 and 8 thou, with just a little extra "kick" at about 8ish, just as it should be I guess.

Top gear still feel's hopeless below 8thou. The bike is still running stock gearing, though I've got a 42t rear to go on.
Will this be enough?

Mind I'm 6'2" and 14st won't help....
I also noticed the back wheel was dry, and rear disc was fairly hot, so that might be binding, got new pad's to go in anyway.

I'm amazed how this bike kept running without misfiring, with the coil feed wire in the state it was, doesn't sound typical Honda to use crappy end of roll, bargain basement wire!
All the other wire's look good from what I can tell.

I get a feeling I'm not the first owner of this bike that's been baffled by this problem,
The previous owner spent £600 on 'the electric's'.
The motor run's sweet, did the owner before that have it rebuilt? (certainly has good compression).

It's taken me (intermittently) from the end of July to trace this fault and nearly given up on several occasion's....

Many Thank's to everyone who has contributed to my ongoing queries.

I am now going to SHUT UP!

Regard's Phil

'93 NSR 250R
'01 TRX 850
'76 H. 400/4

P.S. I may take the carb's off once more, just to check that there's no Pond Weed wrapped around the crank!!!