Got a 90 outlaw , motor keeps popping , it idles fine but as soon as you press on throttle it backfires an won't increase r..pm.. Did carb rebuild with no change.

Question edited for FULL 'make model (what it is)', from 'banshee'.
Question moved from Motorcycles to correct Category.

Check spark plugs.
Clean Carb.
Check timing.

More here, it is a known issue.

https://www.google.com/search?q=Yamaha+banshee+atv+backfires

..

backfiring is usually a sign of an air leak in the intake manifold

Check for vacuum leaks. Spay starter fluid around intake,carb base, etc., while engine is idling, listen for change in engine idle.
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carb needs tuning

did you remove the carb and clean in a vat and rebuild it or just sprayed a can of carb cleaner thru it. needs toom part and cleand and rebuilt... this is a comman issue with those models

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try cleaning carb and running ethanol free fuel with injector/carb cleaner in it

romove carborator. pull apart and carefully clean. Do not use brakleen or carb cleaner use a proper carb cleaning kit

Carb is gummed up

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First question since i am assuming it was just sitting around for some time if i am correct you need to pull the carb remove the float bowl and components if everything was done correctly with your rebuild the likely problem is your carb is gummed up remove everything in the carb low speed jet etc. soak everything in sea foam fuel cleaner overnight and hopefully you have some compressed air and blow out that low speed jet and passage way pay close attention that you have see fluid coming from the other end and check the jet make sure it is unclogged hold it up to the light.