help getting more out of my yamaha banshee 350 quad?

hi all ive just got a used banshee 2001 model its totaly stock but has had a 1 into 2 carb upgrade kit put on it this was done before i got it ! ( i think this is to make tuning easyier ) it starts and runs fine but it seems like a lifetime for the power band to kick in and you always seem to be waiting for the band if you know what i mean, i did a comprsion test and both pots are putting out 115psi witch i beleive is fine any help or tips would be great this is my first banshee and i was hoping for more lol i love them and wanted one for 15 years lol
ok if its been chunned for top end speed how can i tune it the other way for more off the mark power?
 
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