[Beech]

While your checking for air leaks in your throttle body to engine Rubber connectors also the Orings under the metal engine spigots need changing. And these bikes suffer from clogged carbon vapor recovery canisters if they are the USA model. Look up how to route and plug lines and remove the darn thing.
There is a pretty good chance that the crankcase breather tube running on top of the engine block is trash and allowing air to leak in also.