12V 1.7KW 11T Starter Motor CS1419 for 125i, 428i, 316i, 640i, X1, X3, Z4

Overview of the CS1419 Starter Motor

This CS1419 starter motor is the 12V, 1.7 kW replacement for 125i, 428i, 316i, 640i, X1, X3, Z4 applications. The housing, drive end and terminal positions follow the original design, so the unit bolts straight onto the bell housing and reuses the existing cabling.

Because the motor is only used in short bursts, heat builds up quickly and escapes slowly. A starter that has worked for years in traffic or on site will show heat-hardened resin, shortened brushes and a pitted solenoid contact long before the windings fail.

Specifications at a Glance

• Rated voltage: 12V
• Rated output: 1.7 kW
• Pinion: 11 teeth
• Type: reduction gear starter with pre-engaged solenoid
• Application: 125i, 428i, 316i, 640i, X1, X3, Z4
• Net weight: approximately 3.6 kg
• Condition: new, direct replacement for the original unit

A 12V 1.7 kW rating is the output the motor can hold while cranking, not a peak figure. It is sized so the engine reaches starting speed on the first or second revolution, which is what makes a healthy start feel immediate.

The reduction gearset lets the motor run at high speed while the pinion turns slowly with high torque, which is why the unit stays compact enough for a crowded engine bay.

Reference Numbers and Cross References

The reference family for this starter covers the numbers listed here:

• 12417550975
• 12417589350
• 12417589352
• 12417589353
• 125i
• 428i
• 316i
• 640i
• 12417638195
• 12417638196
• 12417638197
• 0001138001
• 0001138002
• 00011380430001138044
• 0001138049
• 0001138057

Cross references are a guide, not a fitment guarantee. The same engine family was often built with more than one starter, and the pinion module or terminal bracket can differ between them, so confirm the number on the unit being replaced. This starter is listed with 16 references in total.

Where This Starter Is Used

125i, 428i, 316i, 640i, X1, X3, Z4 applications in this range share the same mounting pattern and terminal layout, which is why one reference can serve several model years. Fitment is still decided by the starter number rather than by the badge on the vehicle. Where a CS1419 has been replaced before, check that the fitted unit still matches the reference list.

When ordering for a fleet, quote the starter number from each vehicle rather than a single model reference; mixed build dates are common and the starter changed with them.

Common Failure Patterns

Most failures start at the solenoid contact. Each start switches the full cranking current through a copper disc, and after thousands of cycles that disc pits and burns. The result is the familiar single click with no rotation, or a delay before the motor turns.

Heat is the underlying cause in most cases. The starter sits close to the exhaust, and after a hot shutdown the solenoid winding and brush plate soak in heat with no airflow. Resin hardens, springs lose tension and the contact oxidises. On 125i, 428i, 316i, 640i, X1, X3, Z4 installations, access to the CS1419 usually decides how long the job takes.

Diagnostic Signs

• Cranking that sounds normal but takes longer than it used to
• Several attempts needed before the motor engages
• Black carbon dust inside the drive end housing
• Voltage dip that dims the lights during cranking
• Starter that responds to a tap on the housing but not to the key alone

On a high-mileage vehicle, worn brushes and a burnt solenoid contact usually arrive together. If the motor bench tests well but cranking is still weak in the car, inspect the main cable and earth path before fitting another starter. Because the CS1419 reuses the original bolts and connectors, no adapters are needed on 125i, 428i, 316i, 640i, X1, X3, Z4.

Before You Fit the Replacement

• State of charge and age of the battery
• Corrosion on the earth strap and the engine-to-body bond
• Pinion tooth count against the ring gear
• Free movement of the new pinion before fitting
• That the signal wire connector seats fully on the solenoid

Fitting a new starter onto a worn ring gear or a marginal battery shortens its life. Check the simple items first, then fit the unit once and correctly.

Fitting Guidance

Isolate the battery, mark the terminal positions, then disconnect the main cable and the signal wire. Clean around the mounting flange before the starter is withdrawn so dirt does not fall into the bell housing.

Check the ring gear through the aperture before fitting. Install the new unit with the original bolts, reconnect the cables in the same order and tighten the main terminal without over-stressing the stud. Crank briefly and confirm the pinion releases as the engine fires. For the CS1419, the practical check is the number stamped on the housing.

Quality Control and Supply from Hejian Nuojin Auto Parts Co., Ltd.

Each production batch is inspected for housing dimensions, terminal integrity and pinion fit, and every starter is bench tested before it is boxed. Units ship in neutral cartons with foam protection, which keeps freight damage low and allows distributors to label stock under their own brand.

Common references are kept in stock for fast dispatch, volume orders are delivered in around 30 days and each starter carries a one-year warranty against manufacturing defects.

Frequently Asked Questions

Why does the starter work cold but fail when hot?

Heat raises solenoid resistance and reduces brush spring pressure. Both effects build up gradually and appear first on a hot restart.

Why does the starter click but not turn?

Most often the battery is low, a terminal is corroded or the solenoid contact is burnt. Measure battery voltage while the key is turned; a healthy battery that still gives only a click points to the solenoid.

Does the starter need any maintenance?

No routine maintenance is required. Keeping the battery, terminals and earth connections clean is what extends starter life in practice.

How long should a replacement starter last?

There is no fixed interval, but a starter fed by a healthy battery and a clean earth path will outlast one that is repeatedly cranked on a low battery.