TV175 S3 Heavy Clutch and Gear Shift

I've just bought two TV175 S3's, (a 1962 & 1965) and the '62 drives and changes gear like a babe! The other one ('65) has a clutch action which needs Popeye to pull it in and Bluto to twist the gear change. I haven't had a look yet but am assuming that there is a cable routing issue? The throttle isn't what you would describe a feather touch either. The machine has been fully restored but not ridden by the previous keeper. I really doubt that it could have been, even if he had wished to. Any suggestions (keep it clean!) would be appreciated. I've only recently returned to Scooters, having had an LD in 1966; it was old even then! Mixed feelings then, from each end of the usability spectrum.......