Hi all. Could do with some advice/help please. Am thinking of buying a good condition Vespa PK50XL. 95 vintage (import from Germany). I’ve had two PX200’s and a PK80 in the past. But if buying the PK50 my question is, which is the best kit to slightly increase torque and top speed but most importantly, to be reliable? Also if possible, to be fitted by a home mechanic? My thoughts are either a 110cc engine kit, or 135cc. But as I say, reliability trumps all other considerations. All help and advice appreciated. Thanks!