1989 Fourtrak EL - Autochoke off when cold and on when warm - Grrrrr!

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Hi everyone,
I have a 1989 Fourtrak EL 2 litre petrol.
The autochoke is always off when you start from cold and then once the engine has warmed up, the autochoke comes into life. I have to stop, switch off the engine, restart to get it to go off again.
Can anyone tells me what's up please?
Happy to get my hands dirty ...
Thanks!