TT600RE poor start from cold and in the wet

[dieg0oo]

hello guys

I bought my TT600RE reg '03 (electric start version) about an year ago.

although i keep it outside overnight (in a sheltered area, and under a thick bike-cover) it has always run well. started easily in the cold, dump, winter mornings at first or second attempt. also, often ridden it in the very heavy rain, without any problem at all, until a month ago.

last december I went for a wintery trip to europe, after a whole day in a very dense, wetting fog, in the france countryside, in the evening the bike started spluttering and switching off on me, even if started-up again after few minutes, each time.

the next morning it wouldn't start... no ignition whatsoever.
the local garage changed spark-plug and spark-plug's cap, as they say that lots of humidity went in.

the bike was fine for a while, but few days later, after I got back to london, the bike was still spluttering in the rain, and in the morning is very difficult to start up, which is very strange.

even now, after the 12,000 miles service and MOT, done last week, it still struggles to start up... it starts up after the 6th or more attempt, and the battery is going flat....

any idea?