i have 01 ds 650 that will not start. i rode it friday and saturday. just before i got back to the house saturday it shut off on me but started right back up. since then it will not start. It rolls over but doesn't fire. it will back fire every now and then. i have checked the wires, cleaned the carb and added dry gas just in case it was the gas. it is getting spark and fuel to the carb. please help

 

Now you know what the DS stands for - Don't Start