OK, so I bought a load of genuine Keihin jets as the jets in the carb were unknown age and brand.
Fitted a 45 PJ and it ran terribly, back to a new 42, better but still sputtering at very low throttle constant speed. Now back at 38 and it's better again and seems to start OK hot or cold. Still a bit of a sputter, but maybe it's as good as it will get. AS best at 1.25 turns out. Throttle response from closed to 1/8 throttle is clean. I think I'll run it with the 38 for now and see how it behaves on the trails.
Clip position 3 was a little sputtery at 1/8-1/4 throttle. lowered needle 1 clip position to lean out and it's clean at midrange now.
Main now 180, from 178. Might try 1 larger again as a plug chop (clean new plug) was still a little pale on the plug for my liking.
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