This is the best carb for most 66/80cc 2 strokes. Promise. The NT carb is a solid carb. All you have to do is set it up properly and you are good to go. This carb will handle modified engines as long as you jet properly
Jet Kit – https://ebay.to/2zZ2cnc
Best Carb – https://ebay.to/2W28VoL
All Metal Throttle Assy – http://custombuiltmotorizedbicycles.com/suggested-how-to-upgrade-throttle-assembly-for-motorized-bicycle/