Hi just bought my daughter a 06 mini trial  and as I’ve now found out I have the old problem of reving high on idle etc , then dying out when idle screw adjusted down , I’ve seen a few posts from years ago but did anyone ever find out a good way to sort this out ? , also pulled clutch cover off and found a clutch totally different to what I see online for the mini trial (as per picture ) ….. do I fit a new carb or buy a new clutch? 

My experience with small bikes suggests the carb could still be blocked, the jets are tiny and take some clearing out as do the airways in the carb itself. Also if it has a dellorto carb, these often have 2 slow running jets in the same boss. i think your clutch issue is just that this bike could have come with a centrifugal clutch from new