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At the risk of starting an oil thread, heck, I might as well go ahead and ask.
What should I use ?
3 1/2 Sport, warm to cool climate, not raced.
Cheers.
I should have the bike in a couple of weeks

10/40 semi synthetic or 20/50 if weather not British. ie warm! Just my view, as when we do have some warm weather I find my breather has more than fine mist...

At least we do not suffer from dust clogging up the air filter.
Greenfly more like it.

Thanks.
Might go 20 40. Coldest it gets here is 8c.
When summer comes again will put 20 50. It can get to 46c , but I don't ride in that.