I bought a 650 tonight and it wont start. the guy said that it sat for like 2 yrs and wasnt started.. we took the intake apart and poured a lil fuel into the carbs and it ran for a second and then turned off. it is getting spark. when ever i took off the hoses where the three hoses from the front came to a block and tryed to start it and nothing was coming out of them. so i took the hose that goes to the carbs off the canister and filled it with gas and it held there till i tried to start it and it sucked it down. im lost what do i do and where do i start.