If you have good fat spark and there was no undue valve train noise prior to this problem, then your problem lies with fuel delivery, or restriction of it.
Air/fuel mix has to be right at start up and as such, all of the inlet system should be inspected or serviced. From air filter inlet, filter, manifolds. Fuel tap, fuel filter, fuel lines, float levels, float needle and seat, pilot and main jets, needle and slide.
Start with filters, check needle/slide are rising in unison and fuel is flowing freely to floatbowls. Good idea to take drains out of carby's and spray some aerosol carby cleaner down fuel lines till it flushes thru' carby' drains. Check carefully condition of inlet manifold providing an airtight seal. There is a sitelink below that has exploded views and part names for all sections for your bike to assist.
Cheers.
http://www.cmsnl.com/suzuki-gs500-2000-euy_model13470/partslist/
air box connected still hard to keep started. have to give it throttle to keep it on and when it does go it tops out at about 45 mph while ceiling at 8000 rpms . It seems to shift cannot keep it going.
wont stay on by itself after put into gear needs constant throttle.
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