VIP 2007 WILL NOT SHIFT TO HIGH SPEED RANGE??HELP

[90GTVert]

While a lot of people have success with recommended jets, my recommendation is always to buy a jet kit or a selection of jets and tune the carb instead of installing a jet and hoping it's right. With variations in air temperature, density, and so on there's just no way one jet works best for everyone. I own a range of at least 20 jet sizes for every carb I own. I've worked on quite a few similar setups for myself and others and even with pretty much all specs the same, same location, similar temps, etc... the same jets don't always work best from one scoot to the next.