I Need Help Baddly

[z400ryder89]

hi i have a yamaha 100 enduro bike and i rode it when i got it it sat for a couple weeks then i tried to start it the compression seems low the kick start doesnt go back up all the way,when i get it started i have to put gas straight into the cylinder and when it starts it revs way too high and it will only stay running for about 5 seconds
if u can please help me

 

[IndyMX]

First of all, you double posted in the wrong forum, with not enough information to be very useful.