My name is Doug and I am new to the ATV world. I bought my girlfriends kids a 50cc Hansim ATV and it wont idle. The idle adjustment screw and the fuel mixture screw seems to do nothing. Carbs aren't very expensive for these on eBay so I'm just going to purchase a new one. What i need to know, is the carb on this ATV a 16mm or 19mm and does it matter? Thanks in advance. And I'm sure i will be using this forum a lot.

 

Nothing?

 

The Venturi is just the size of the internal opening of the carb by the slide. Most of these little Chinese carbs don't give this size. Here's one that can go from a 50cc to 150cc engine.GY6 Scooter 50cc 150cc Performance Carb 2 Stroke OKO 24mm Racing Carburetor New | eBay

 

Thank you. Its a four stroke. I believe i found one for it. I ordered this one.
19mm Zinc Carburetor w/Hand Choke Lever for 50cc-110cc 4-stroke ATVs, Dirt Bikes, Go Karts. Hope it works.