mod gpx jetting

44's are too big for any gpx ....40's are the ticket .....but regardless a good starting point for them would be
2.5 C/A
7DH2-3 needles
35-40 pilot at 1 turn out
AA-5 tubes
and since we are in the cold weather now I would say 420 ish on the mains but please check or to be safe start with 450's
 
What all has been done to your motor and has the motor been on a dyno for HP! If it is close to mine I can give you my set up for 660' on ice
 
my gpx ran hard on ice i used 44 mikunis and 45.7 mikunis both ran good. with 45 pilots and. 520-560 mains. mod motor done by delaughter with new delaughter pipes.... 2.5CA I BELIEVE I ran AA-5's they will go to 580 then BB-0
 
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