I recently bought a 63 plate lf50qt2a second hand it's running for literally seconds before cutting out I've checked and cleaned spark plug battery is charged  I've also checked carb which is clean.  When it does run for longer it runs sometimes on centre stand then I try and ride it and it cuts out while reving up. Could also do with some advise on location of fuels popes as I'm a bit suspicious of where they've been connected by previous owner thanks