HELP! Wont strat!

[Noer]

Hi , i am new here . I bought GS 500 1998g . I had before 5 years gs500f now i bought for project. So problem is motorcycle wont start . Spark is there , i opened carburators and cleaned 2 jets on everey piston. Put it back and still wont start. I use start spray motorcycle started and wprking couple of seconds and die.New gasolin puted.i dont have any idea what to look. I dreind carburators 3 times thinked that gasolin is not coming to them but gasolin is every time there.        now i dodnt know what to do next. Please help!    

[Noer]

Today ,opened carburator cleaned one more time pilot jets. Puted new sparkplugs. And still not going        pured breakcleaner in cylnders started worked 3 secs. Turning wont start still!!

[Noer]

Problem solved, slave under the tank was doing problems ... but now when k give gas rpm gos down dont have pover ... small detonation in exhaust and dan rpm start slowly growing

[Kirby]

Problem solved, slave under the tank was doing problems ... but now when k give gas rpm gos down dont have pover ... small detonation in exhaust and dan rpm start slowly growing

Your problem sounds close to what I had, I know it may seem strange but if you have changed the spark plugs for new ones, you may need another pair. I brought 2 sets of spark plugs both of them were faulty before the third set were fine.
 Could also just have to much fuel coming through.