My Fizzer is like that....Immagine how hard it is with four carbs. I heat it up to soften the rubber(blowtorch(be careful!)).. But you got to act fast or they get hard again quick !!
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MC21
04 NSR50R
93 CBR F2
98 CBR F3 track bike
95 VFR750
89 FL400R Pilot
90 FZR 4/600