If you are looking to see significant performance gains on your G62 by simply tweaking the stock HDA-48 carburetor, you're headed down a road with little upside. The G62 has a TON of potential, but most of it is lost inside the engine, not up front with the carb. Proper porting (or, if you are feeling more agressive, the addition of a cylinder reed intake and proper reed porting) will allow you to add a significant power improvement throughout the RPM range, and quite a few more RPM's on top...