ZS125 125cc High Output Engine (Motor Base Kit)

The Zongshen ZS125 High Output is one of the most respected 125cc motors for mini bikes. Built with a big-valve 27/23mm cylinder head, racing camshaft, and a high-compression piston, this engine offers excellent torque, reliability, and throttle response in a compact package.

It bolts directly into Honda CT70, Z50, Dax, Monkey, CRF50/70, Pitbike, ATC70, and Icebear Champion frames with no modifications. Intake and exhaust patterns match OEM style, making this motor a straightforward upgrade.

NOTE: This motor uses an 8 Pin CDI, while our normal line-up uses a 6 Pin CDI. If you are running this in a 6 Pin CDI bike. you will need this 8 Pin CDI to 6 Pin Harness Adapter – ZS125, ZS155, Daytona 125+

Key Features:

• 125cc Zongshen High Output Engine
• Big valve head (27mm intake / 23mm exhaust)
• Racing camshaft + high compression piston
• Small-rotor ignition for quicker throttle response & reduced engine braking
• 5-disc manual clutch with oil cooler outlet & external filter
• Bore x Stroke: 54mm x 54.5mm
• Power output: ~13 horsepower
• Transmission: 4-speed manual (N-1-2-3-4)
• Kickstart only (kick pedal included)
• Oil cooler ready
• Uses an 8-pin CDI (included)

Included in the kit:

• Complete ZS125 engine assembly
• Gearshift pedal
• Kickstart lever
• Oil cooler hose set (cooler optional)
• 8-pin CDI unit

This motor is powerful, reliable, and race-ready—the ideal upgrade over stock 70cc or 110cc engines, giving you modern performance while keeping Honda-style compatibility.