45,000 miles on my 51 plate speedfight

I have a 50cc peugeot speedfight 51 plate I bought it off a friend last year when it only had 16,000 miles on it. My friend had done a lot of quick fixes just to sell it, since I have had it it has had a new exhaust, two new starter motors, new starter relay, full kickstart and transmission re-build. It is on stop again now, it took some time to start in the rain, it went about three miles and then when I slowed down for the junction it cut out and wouldn't start again, hoping it just needs a relay, or a fuse. the boy's down at the local garage asked me how many miles it had done when I told them about the problem, they said i was lucky i got past 20,000 miles on a speedfight. I would have liked to have bought a new bike but I thought if I bought it off a friend I was doing him a favour, so much for friends.