I HAVE AN MBK ROCKET 98 with minarelli vertical engine , my bike was running on an 85 main with the standard air box this was ok but would cut out if i had the throttle on full for to long E.G. A long straight I could only get about 40 on a long straight and that's with all my addons pipe,carb,70cc kit,variator blah blah blah but i was told this is quite normal for the model of my scoot and the only way to increase top end was with gear up kit.So I went and bought a gear up kit and fitted it also i thought i upgrade to an Doppler open air filter for a bit more grunt, since then i have tried every jet size known to man from 80 - 120 90= doesnt start, when it does cuts out early 103= struggles to revs up and then cuts out when revs high 110=revs up then cuts out when revs are high 120= revs up then cuts when revs are high its starting to make me think there's something wrong with the electrical on this bike $ ( or that maybe ive got the wrong roller weights in im at about 4.3grams at the mo!
