Hi all, my hesitation problem has got significantly worse recently. MPG has dropped (140 miles put me between E and 1/4), it still hesitates badly when opening it up and it's also started running really rough on constant throttle. For example, get up to 5-6k in a lower gear (it's still there in high gears, just less noticeable) and you can feel it surging like it's running ok for a second, then missing, then ok etc. After my 50 mile run home downpipes 1 + 2 were 220C and 3 + 4 were 170 so something definitely isn't right there. It's also spitting a lot of black shite out of the exhaust which is presumably my hard earned, half burnt petrol
It's over-due a service so I want to get oil + filter, air filter, plugs changed this weekend - I changed them ages ago when it was hesitating, but not this bad and none of them had any effect - but what else can I check? Carbs have been balanced recently and were as close as we could get them and it's had new plug caps a week ago. I also trimmed the leads recently, couple of months back.
I would like to get a known-good set of carbs on it as I have a gut feeling that they're the problem but a) don't know much about them and b) use the bike every day so can't really afford it to be off road for any amount of time (unless I can borrow the blackbird again, maybe this is a good excuse
)
So, anyone got any idea of things I can try? Hopefully this won't turn into another Red98-style epic....
TL:DR
Bike hesitates, what's broken?
Ta very much