ok so last week i bought a 87 600f for $125 and knew nothing except
1- crashed
2- hasnt ran in six years
3- has had 3 owners in the past six years

so i started messing around with it and noticed the oil smelled like gas really really bad so i changed it. fuel filter was cloged got a new one.
so 8 bucks later some new gas and a can of starter fluid and 30 min of time it was running. it bogs down if you try to give it gas but i think a good carb cleaning and sync will do the trick ill post pics of this project here in a bit

 

after looking at the bike a little more carfully i noticed a crack in the frame and the part of the frame the seat mounts to is bent any ideas on what i can do

 

Get a competent welder to fix it for you, that's about all you can do. The frames on these old girls are just plain old steel, any body shop or welding shop should be able to handle it.

 

weld it up, grind it down and paint.