i have had the same problem mate but mine is standard the promplem is water gettin to your electrical conectors and in the worst case getting to your cdi unit i hav found and took me 4 days to dry it out also i have had problems with the oil and tepmerature light comin on in rain but i put a bit of grease round the conectors and now is all fine hope u get it sorted mate and may i ask wat exhaust and carbs you have as i am looking at derestricting mine soon