Hope this is now sorted, the easiest thing to do to check a sick engine is take the filter out and see how it runs, if it runs ok you've got a blocked filter if it runs worse its running weak-fuelling/carb. Then check plug/s; dark=rich, pale=weak, they should be a "biscuit" colour (I always go for cardboard box brown). Its good you now know the innards of your carb. cleaning it out can't hurt and sorting leaking exhaust should help smooth running.
A friend had a CG 125 and the choke was travelling beyond off to being partially on over centre(does that make sense?) causing the bike to hold back.
P.S. always get someone else to hold the HT lead
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