CDI - 6 Pin - Dual Plug - High Performance - GY6 50cc-150cc Engine - Version 42 This 57mm cylinder kit is

This 57mm cylinder kit is the replacement part for many 4-stroke Chinese  ATVs

Fits Coolster 3200

Electric start switch

Gaskets & fins on jug are also a help in determining the version you have

CDI - 6 Pin - Dual Plug - High Performance - GY6 50cc-150cc Engine - Version 42 This 57mm cylinder kit isChinese High Performance CDI Version 42 CDI fits GY6 50cc 150cc dirt bikes and scooters. CDI details: 6 pins AC Dual plug (plug as pictured) Smaller plug: 2 pins Larger plug: 4 pins. Box dimensions: 67mm x 56mm x 30mm. Plugs directly into bottom of unit High Performance Adds 8 10 percent more horsepower Fits many GY6 makes and models Aimex, Baja, Carroll Stream, Ducar, Eagle, Giovanni, Howhit, Jackel, Kazuma, Loncin, Redcat, Roketa, SunL,Tank, Tao