Thanks for all the input guys
Fixed the link to the video, it's only 7 seconds long and a bit grainy anyway. EDIT: I really have no idea whats up with the link, it works in the preview pane but only seems to link back to this thread once saved. URL is
if you want to copy paste.
Yes I think there may be a very small air leak, I've tried epoxy sealing the loose connectors in but the flexible rubber makes for bad adhesion. I might try some vulcanizing stuff from a bicycle puncture repair kit but it's the heat tolerance i'm worried about as they're right up against the head. Sprayed brake cleaner on the area with the engine running and it doesn't change anything.
I fitted the new NGK caps myself a couple of years ago and snipped off 5mm from the HT cable as advised. I will check they are screwed on as tight as poss.
TPS shows 5000rpm.
For the plugs I think I'll try and soak them to get them clean, fix the problems I seem to have with over-fuelling and then do the iridium upgrade.
Regarding removing caps whilst the engine is running, I never thought this would cause an issue! Perhaps there is something there, I wasn't sure 3 was firing a while ago as the exhaust took much longer than the others to heat up. I removed the cap and the revs obviously dropped so i knew it was firing. I checked all the others at the same time so perhaps I damaged the capacitor then and now too much spark is going to my plugs and it's forcing the Colortune to arc to the head.
Any ideas on sourcing new ignition coils and leads? Fowlers says 114EU for one coil
The bike runs reasonably well to be honest, just a slightly lumpy idle and the rev needle bounces up and down. I guess I'm striving for perfection.
Maybe I should just try and adjust the mixture screws with the bike set-up normally? Is it so difficult to hear when it's running right?