U clamp for bigger tube frame. Engine head is straight (make sure if enough space on the bike, some mountain bike may not fit). You may or may not need to modify the 4 cylinder holes to let the bottom end bolts fit in (just drill holes little bigger). All the parts shows in the picture. The item "80cc Rat Kit Assembly Bicycle Motorized 2-Stroke Gas Motor Engine NEW 8mm" is in sale since Wednesday, June 10, 2020.This item is in the category "Sporting Goods\Outdoor Sports\Scooters\Gas Scooters". The seller is "bgf-motor" and is located in Tomales, California. This item can be shipped to United States.