Hello to all! I am a proud friend of a 600rr owner. He wanted help with an oil change and replace the bolts to a two brothers exhaust pipe and in return, I could use the bike until he returned. The muffler is attached to the pipe by 4 screws. These 4 screws backed out and were lost so the muffler was hanging, detached. The bike ran fine when he unloaded it at my house, loud, but ran fine. I pushed the muffler closer to the pipe to see what hardware may be missing so there was about a half inch gap between the muffler and pipe. I turned the key on, heard the whine of the fuel pump being primed, and started up but died after idling only a moment. I tried to start it back up but it would not. after waiting a day, i did the same thing only to have the bike die again after idling a moment. the next day, i pulled the muffler away from the pipe and started it. the bike idled fine and there were no problems. I dont know anything about this motorcycle or any other but i figured i would be as detailed as possible to determine the cause. a week later, i changed the oil. the battery was pretty much dead because the bike has been sitting up for a few months and only being started once a week to idle in the garage. with all the starting because of the muffler problem, i guess it was enough to kill it. so i jumped the bike off with a jump box and rode it around town about half an hour with the fresh oil. the next day, i bolted the muffler back to the pipe, went and filled it with gas, and rode it to work across town. the bike ran like a top. i should mention that i also cleaned the bike with soap and water before i rode to work. i doubt it matters but i dont know. so here is where it gets weird. when i was about to leave work, i started the bike up which was parked only about 20 feet from the front door. i forgot to lock up so i decided to leave the kickstand down and just putt over to the door. the bike died as soon as i clicked it into gear. i wasnt sure what happened because my headphones were on so i thought it was possible i just let the clutch out to fast so i restarted the bike and did it again. the second time i figured it had something to do with the kickstand so i was going to raise the kickstand. the bike will not start now at all. the fuel pump will not prime. i dont know what the kickstand sensor could possibly have to do with the bike not starting but it seems to be connected somehow. i left the battery unhooked hoping to clear the problem from the ecm's memory but it didnt help. i pushed the kill switch back and forth a bunch of times to see if it was stuck but it didnt help. i raised and lowered the kick stand about 800 times and nothing. i waited 3 days to turn the bike on and that didnt help either. to be clear, the engine turns over but the fuel pump does not prime. i did not drop the bike or turn it on its side. i was sitting on the bike when this happened. someone please help me! i need to fix my friends bike and return it to him. i feel terrible that this happened when i was only trying to help him save some money. thanks so much for everyones help!