40mm bigger crank bearing to give engine more power. New style 2021 black G5 iron/steel sleeve wider 40mm intake cylinder. Short connecting rod with matched lower hole piston 15/16 or 25mm. Build -In CDI (n need external CDI). The item "BGF G5 / Super Rat 80cc steel sleeve replacement GAS engine 2-stroke motor bike" is in sale since Wednesday, December 2, 2020.This item is in the category "Sporting Goods\Outdoor Sports\Scooters\Gas Scooters". The seller is "boygoesfast" and is located in Monterey Park, California. This item can be shipped to United States.