Early version had more power but less reliable with dodgy piston, tensioner, small-ends and valves. Restricted model (post ’82) needs revs to survive but basic-ally reliable until 25k when the top end begins to rattle. Neglect of oil changes causes main bearings to rumble but given a bit of effort 12hp models are reasonable learners that handle and brake better than most. Clutch judder, exhaust rot and spark plug demise normal.
