The budget friendly option is to do as Thumper suggests. If it's sealed, unseal it, clean it, and adjust it and jet it as necessary.
If the needle has no adjustment you can buy ancheap rebuild kit from Amazon or eBay that will come with new seals and an adjustable needle.
As for "aggressive" throttle, do you mean when trying to go wide open? Trying to open the throttle quickly?
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