I own a banshee myself,but never got to ride it as it come out of the box cause i bought it with an italian 5port pollini engine conversion.
Like the others said,replace bearings,fuel line,fuel filters to start with,then id change that nasty chinese chain as they tend to break very easily,and work on replacing the bolts as you go,use some decent coolant thats glycol free if you plan on racing.I use redline water wetter in mine,its good stuff but pricey
Should be fairly reliable after those things have been done,and if your not happy with the grunt,then id look into getting a euro top end kit,19mm dellorto carby and exhaust,you wont know what hit ya mwhahahahah
But these kits arnt cheap,i guess it all depend how deep your pockets are prepared to stretch,good luck
