I have a question about my H1 I have recently bought. It is an import and has done just over 10,000 miles. It is very clean, and original.

It seems to idle a bit lumpy when cold, and will stall easily if the throttle is opened too quickly. The choke doesn't seem a lot of good either, it sort of hunts about when it is turned on. It isn't that bad, I am just not sure if it is right.
I am going to use a bit through this winter, has anybody got any advice on the best thing to wash it, and stop the poxy salt eating it! I will clean it after every ride, but is there anywhere where crap will build up?
How do I determine the 'SP' model?

Many thanks, Will.