Different carb, that came with it, but using the same mag etc etc.
The engine wont fall back onto idle very quickly, it seems to want to race for a short while and then settles back.
I would usually put this down to worn bore on the carb , but:
- it responds to the mixture screw (which in my experience worn bore carbs rarely do)
- strangely enough likes to start, from cold, without either a flood nor the choke closed
- Once it's at idle, it's fairly steady.
There are no carb leaks at the head (tried the wd40 trick), it's all been cleaned out, there is play in the throttle cable and the slide is hitting bottom without hanging up. engine pulls fine as well.