i took my 2005 crf250r out for a ride today. Started fine, ran fine for about 20-25 mins and then all of a sudden it started backfiring and just cut out. i couldnt start it again so i pushed it home. when i was home i kicked it over for a while and if fired but was still popping and banging and cut out again!!
I i left it cool down, tried again but still no joy

Any ideas on what the problem could be??
Thanks matt