2006 Aprilla sr 50 r , rebuilt engine new bearings crankshaft , 50cc head piston rings cylinder head , has got upgraded roller 4g and malossi clutch springs , gianelli extra exhaust , was just wondering I have a original carb 17.5 with 30 and 95 jets and aftermarket air filter , trying to tune it is a becoming a ball ache any suggestions I’m thinking of changing jets?