Carb Tuning

Location
Kansas
I have a 701 SN i rebuilt over the winter and i'm looking to get some advice on where to start for carb tuning. Engine is 61x case/62t cylinder bored out to 83mm with stock head, single 44mm carb, and black pro-tec pipe. I have no idea what this carb currently has in it for jets(Bought the motor already pulled out of the ski) but was told it was running and "running well". Pistons showed signs of some seizing so it wasn't great... Any ideas or good places to start with this setup?
 
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