A mini pocket bike is a 49cc motorcycle that is approximately 1 1/2 feet wide, 3 feet long and 2 feet tall. The bike runs on a legitimate engine and works the same as a motorcycle. However, the bike is not meant for transportation and is only used for recreational purposes. Building a homemade mini pocket bike from scratch is complicated and will require previous knowledge of motors and motorcycles. The process will take a week or more.
Set the frame upright with the handlebars pointing up. Attach one brake system to the front wheel and match it to the holes on the frame. Drive a bolt through the frame into the wheel and out the other side. Tighten it with a wrench. Route the wire from the brake up the frame and into the right handlebar. Tighten with a screwdriver.
Bolt the engine to the underside of the frame, where a large hole is. Drive the bolt through the mounting holes of the engine and through the hole on the frame. Drive another bolt through the back mounting hole of the motor. Hold the bar up against the bottom of the engine and mark where the mounting holes for the foothold bar are. Drill through and bolt it on. Drill a hole through the bar on the right side and mount the brake pedal on. Drill a hole through the left side and attach the gear change to the gear change knob. Route the line from the clutch in the engine up the frame into the left handlebar. Route the throttle line up the frame into the handle on the right side. Attach it to the grip with a screwdriver.
Attach the brake system to the rear tire, hook the chain from the engine up to the gear on the back wheel and attach the wheel to the frame with the axle bolt. Route the brake line to the right brake pedal and tighten.
Bolt the gas tank between the handlebar and the motor. Route the gas line from it into the engine. Bolt on the seat. Bolt the case on to the frame.