Universal Parts Lower Starter Motor | 49cc - 125cc 4-Stroke
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Restore reliable starting performance to your vehicle with this Universal Parts Lower Starter Motor. Designed as a direct replacement for horizontal 4-stroke engines found on youth dirt bikes, pit bikes, and ATVs, this unit drops in with factory bolt-hole spacing and delivers consistent cranking torque from the first turn of the key.
Key Features
- Direct Replacement Layout: Form-fitted for lower-mount configurations where the starter mounts underneath the engine block/carburetor.
- 12-Tooth Drive Sprocket: Precision-machined gear ensures clean, positive engagement with your engine's starter chain or flywheel setup.
- Robust Internal Windings: High-grade copper coils and heavy-duty brushes deliver consistent cranking torque and dependable cold starts.
- Simple Bolt-On Installation: Built to factory sizing tolerances for a straightforward swap without modification to engine cases.
Vehicle & Engine Compatibility
Fits a wide variety of Chinese-manufactured off-road vehicles utilizing horizontal 4-stroke powertrains (lower-mount configuration only):
| Engine Displacement | Common Applications |
|---|---|
| 49cc / 50cc, 70cc / 90cc, 110cc / 125cc | Select pit bikes, youth dirt bikes, go-karts, and ATVs from TaoTao, Coolster, SSR, Apollo, Roketa, and Kazuma |
Technical Specifications
- Mounting Position: Lower (underneath carburetor/crankcase)
- Bolt Hole Spacing: 68mm center-to-center
- Drive Gear Teeth: 12
- Internal Splines: 22
- Operating Voltage: 12V DC
- MPN: 877
Mechanic's Installation Tip: Before removing your old starter, disconnect the negative (-) battery terminal to eliminate short-circuit risk. Inspect your starter chain and tensioner for excessive slack or wear. Ensure the engine ground wire connection is clean and tightly secured — a loose or corroded ground is the leading cause of intermittent starting issues and low cranking power.
CRITICAL FITMENT CHECK: Small 4-stroke engines use either an "Upper Mount" (above the cylinder) or a "Lower Mount" (underneath the crankcase) starter. This is a lower-mount unit. Physically verify your engine's mounting position and confirm the 68mm bolt-hole spacing before ordering.
Shipping information
Orders are prepared as quickly as possible. Delivery times and shipping costs are calculated at checkout based on the destination and items ordered.
Returns & warranty
Please verify fitment and part number before ordering. Contact Thrifty Scooters promptly if an item arrives damaged or incorrect.