As RJ mentioned, I'm leaning towards this being electrical. As the engine loads increase, the demand on the electrical system does as well. Just out of curiosity, have you put a meter on the battery to be sure the bike is charging?
Also, is your ram air system still in place? I've heard of similar issues with street fighter/naked bikes when the ram air system is gone.
Yep, the RAM is still there and i have checked that all the hoses are connected that feed into the carbs...all looks good.
So, took the bike out this morning....Went to start her, same as before, had to open and close the fuel tank...looks like yesterday may have just been a placebo.
Anyway, she was spluttering like a troope on th emotorway so came back home. When i got home, i got a wet spounge and touched it against the headers
3+4 Instant sizzle
2 - Small amount of sizzle
1 - Barley anything
So, i think both you and RJ are right it's either an issue with the plugs or as it's both cylinder 1 and 2, maybe the coil pack?
Forgot i promised to take the better half out today, so more tinkering will have to wait until tomorrow but i might pick up a couple of new plugs, just encase.
I'm meant to be off on a tour Of Germany (via France, Belgium and Luxembourg) on Wednesday, let's hope i (we) can get to the bottom of this before then.
Once again, thank you all for you help this far!
EDIT - Itested all the ht leads with a known good spark plug...Seems i'm getting an intermittent spark on all 4 leads....Sometimes when i hold the plug to the engine it sparks other times not. Would this indicate a bad earth somewhere and if so where do i start looking??