Hey , My 1991 SR125 Custom Will work perfectly in the morning but when I finish work it won’t run, it starts but then it does like a fuel starvation noise and then cut out! Any ideas please guys?

Im not familiar with the SR125, does it have a fuel on/tap? if yes, are you switching it off when you get to work? if not, the bike might be flooding while parked. Also check that the seal is good around the filler cap, and I would suggest that the bike may run better if you use ethanol free petrol