+1 for wd round the ht caps first... Redex worth a try but never found it effective.. Had the famous 600 stutter before pulling away on my bike recently.. Turned out to be a duff plug so changed them. The tighter plug gap than recommended I figure didnt help either. If bike is rough all the way up to around 4k rpm then sweet as a nut, pilot jets and a carb clean looking favourite imo..
Better to have it and not need it, than to need it and not have it..