Tasha is a string-bean 8 yr. old who loves her trike more than her horses! This 3-wheeler is the perfect kids 3-wheeler, the top speed is surprising & it has power to climb anything and is depenable & gets great gas milage. The thumb throttle, however, cramps her hand badly. I looked in denniskirk for a twist throttle, but can't figure out with throttle kit to match up. Any one have experience with a twist throttle application for this type of carb/trike set-up?