Pointy petrol tank differences

[IanG]

Will a petrol tank from a K4 or K5 or K6 fit my K3 SV650S?

Is it that the only difference is the logo on the side - 'Suzuki' and 'S'

[kwak zzr]

i couldn't be 100% sure but i think they are, like you say the diff will be newer colours and badges.