Under-Engine Starter Motor 12V 12T 68mm 50-125cc Pit Bike ATV
Replacement electric starter motor for compatible Chinese horizontal 4-stroke pit-bike, ATV, quad and go-kart engines using the bottom / under-engine starter layout. This is the two-bolt lower-mounted pattern commonly used across many 50cc, 70cc, 90cc, 110cc and 125cc machines.
Verified Replacement-Family Specification
- Electrical system: 12V
- Starter location: Under / below the engine
- Mounting type: 2-bolt lower-mount pattern
- Mounting-hole centres: approximately 68 mm / 2.7 in
- Starter sprocket: 12 teeth
- Output drive: 22-spline shaft / 12-tooth sprocket family
- Rotation: Counter-clockwise (CCW)
- Overall length: approximately 146 mm / 5.75 in
- Main motor-body diameter: approximately 51 mm / 2 in
- Application family: Chinese horizontal 4-stroke 50-125cc engines
- Condition: New aftermarket replacement
Components Identified From the Product Photos
- Cylindrical steel electric starter-motor body
- Cast-alloy reduction-gear and mounting housing
- Two primary lower-engine mounting points in the cast housing
- 12-tooth steel starter sprocket / pinion on the output shaft
- Splined output-drive section and central retaining hardware
- Sealed front drive/bearing plate
- Insulated electrical power lead with red conductor
- Black protective cable sleeve and rubber terminal boot
- Cast reinforcing ribs around the drive and mounting housing
Aftermarket Manufacturer & Interchange References
- MOGO / Royal Distributing: C01-070101 / MOGO 07-0101 — bottom-mounted 50-125cc horizontal starter
- PCC Motor / marketplace reference: ST02 — under-engine 50/70/90/110cc starter family
- Arrowhead: SCH0005 — 12V, CCW, 12-tooth China-built powersports starter family for many 70-125cc applications
- J&N Electrical Products: 410-58006
- Lester: 19575
- PIC: 199-074
- BMS Motorsports: 30839-C10-29
- Eagle Powersports: 11612-A90-10
- WAI: 19575N
The supplied starter is unbranded aftermarket. The references above identify comparable replacement families and are not being presented as the manufacturer part number stamped on the supplied motor.
Documented Aftermarket Application Examples
The 12-tooth 70-125cc SCH0005 / 410-58006 / Lester 19575 family is catalogued for a number of China-built powersports models, including examples from Baja Motorsports, BMS, Eagle, Go Scoot, Jetmoto, Kazuma and Redcat. Examples include Baja STR125 Baja Storm, Kazuma Viper 110, Panda 110 and Falcon 110, plus several Redcat 110cc ATV models.
These examples are supplied only as cross-reference guidance. Chinese manufacturers frequently changed engines, starters and mounting layouts without changing the vehicle name.
Important 50cc Fitment Note
Some suppliers describe this bottom-mounted physical pattern as suitable from 50cc through 125cc, while specialist starter catalogues separate certain 50cc engines into a different starter family. For a 50cc machine, physical comparison is especially important. Do not order by engine capacity alone.
Compatibility Check Before Ordering
- Confirm the existing starter is mounted under the engine, not on top
- Confirm the engine uses the two-bolt lower-mount starter pattern
- Measure the mounting-hole centres — approximately 68 mm on this family
- Count the starter sprocket teeth — this pattern uses 12 teeth
- Compare the drive/spline arrangement and sprocket diameter
- Compare overall starter length and motor-body diameter
- Check the power-lead position, cable length and terminal/boot arrangement
- Compare the cast mounting housing and bolt-hole positions with the product photos
Top-mounted and under-engine starter motors are not interchangeable simply because the engine capacity is the same. Always match the mounting location and dimensions before fitting.
Installation Notes
Disconnect the battery before replacing the starter motor. Check the battery condition, starter relay/solenoid, earth connections and main power cable if the original starter was slow or intermittent. Install the starter squarely against the engine, tighten the mounting bolts securely and route the power cable away from the exhaust, chain and other moving parts.
What Is Included
One complete under-engine starter motor assembly with the attached power lead and protective terminal boot shown in the photographs. Mounting bolts, starter relay/solenoid, battery cable, starter reduction gears inside the engine and wiring loom are not included unless visibly supplied.
Delivery & Returns
- Free UK delivery with an estimated 2–3 working-day service
- 30-day returns, subject to the item being returned in its original condition