97cc baja mini bike

#1
I read that asking how to hot rod a bike will get me banned, I'mnot doing that my sons bike goes good on flat land but the slightest hill he has to almost help push with his feet to get in to go.it has the stock carb fully rebuilt by a shop ,so my question is would it be a clutch thing or is there a governor issue I watch the carb and it seems the governor keeps it from building power it keeps closing as he's climbs its only a 10 foot rise over 50 feet he is 8 and 60 lbs just want him to be able to ride I have the speed screw at half
 
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