According to the shape of the front arms, chassis plate design, type of shocks etc it's a sportline touring. it's missing the side exhaust but most importantly you can get parts for it as alot of the ones you see on ebay are so old parts availability becomes a real issue. I reckon the pinion's got an hour left in it before the teeth start coming off lol.
I stripped the carb, insulate etc and removed what looked to be lots of instant gasket sealant as had real trouble starting it. changed the insulator block, put a fresh set of gaskets on, reset the low speed needle with adjusted throttle trim and it started straight up.
According to the manual it should be a zenoah g230 but my friend says it's 27.5cc so it's had some work done on it along the line. it's fitted with a multiplex throttle/brake servo and a Futaba steering servo. the steering rods from the servo to the saver are wrong and have been bodged but after some re-bodging by me yesterday they now actually work.