Hello, i have a yamaha tdr 250 and it was sat for about for about 3-4 months and now when i start it, it will run ok for about 30 seconds and then cut out, yet it runs fine with the choke on, me personally think the carburettor needs cleaning but i haven't got round to that.

Please let me know if you know the problem.

Thanks.

Firstly, yes it most likely is a blocked jet.

Second but more importantly, if you haven't already register with the TDR250 forum at tdr250.co.uk