Starter Motor 9000042021 12V 0.8KW 9T VW Beetle
Applicable models:VW KAEFFER (BEETLE) / VW BEETLE / PORSCHE (classic air-cooled 1.2L-1.6L petrol; confirm engine and OE number before ordering)
Reference part number:9000042021, 9000042027, 9000082009, 90000820027, 90042001, 90042009, 111911023B, 111911023C, 111911023D, 111911023BT, 211911023, 311911023, 311911023B, 311911023C, 311911023DX, 0001211013, 0001211014, 0001211992, 0001211997, 0001211998, 0001206006, 0001208006, 191211993, 498601055, 1130042027, 16450N, 16450CN, 2-1340-BO, D8E158, E0343, MS1211012, 6004AA0021, AZ42034, 0986010530, 432543, 433269
| Power horsepower : | 12V/0 8KW |
| Number of feet : | 9T |
| Size : | 24*12*16single unit inner box |
| Weight : | net weight：2.9KG |
| Packaging : | Neutral kraft paper packaging |
| Spot/Pre sale : | presale |
| Warranty : | 1 year |
| Product number : |
| Type : | Starter Motor |
| Specification : | 12V/0 8KW |
| Number of feet : | 9T |
| Brand : | nuojin |
| Number : | 9000042021 |
| Quality : | new |
| Delivery time : | 30day |
Product Attributes
| Power | 12V 0.8KW |
| Number of teeth | 9T |
| Size | 24*12*16 CM single unit inner box |
| Weight | net weight: 2.9KG (gross weight not listed on page) |
| Packaging | Neutral kraft paper packaging |
| Spot/Pre sale | Pre-sale |
| Warranty | 1 year |
Product Details
| Type | Starter motor |
| Specification | 12V 0.8KW |
| Number of teeth | 9T |
| Brand | nuojin |
| Part Number | 9000042021 |
| Quality | new |
| Delivery time | 30 days (pre-sale item) |
Product Overview
The 9000042021 is a Bosch-format starter motor delivering 12V output at 0.8KW with a 9-tooth drive gear, engineered for the classic VW Beetle (Kaefer) and Porsche air-cooled platforms. This unit, cross-numbered as 9000042027 and in the VW 311911023 family, matches the original starting-system specification for these legendary flat-four engined cars.
Fitted with reduction-gear drive design, this brand-new starter motor is supplied on a pre-sale basis with a 1-year warranty and 30-day dispatch lead-time. The 0.8KW rating is factory-correct for reliable cold and hot cranking of the classic air-cooled engine.
Key physical specs: net weight 2.9 kg, overall dimensions 240 x 120 x 160 mm, supplied inside neutral kraft inner carton. The page does not list a gross weight for this item.
The VW Beetle and Porsche Air-Cooled Platform and 12V Starting System
The VW Beetle (Kaefer) and related Porsche models are air-cooled, flat-four engined classics built for decades, running standard 12V starting systems. The starter motor numbering spans the VW 911023 series, the VW 000 series, the Bosch 9000 series and aftermarket numbers, all referring to the same starting-system family.
It is critical to verify the drive-gear tooth count on your old starter: this unit uses a 9-tooth drive gear. Starters with a different tooth count or mounting pattern are not interchangeable with this unit. A starter with the wrong tooth count will not engage properly with the flywheel ring gear.
The 12V 0.8KW rating matches the original starting-system specification. Confirm the mounting flange pattern, terminal positions and bolt spacing against your original starter before ordering. Always cross-check the OE numbers stamped on your old unit, including the 311911023 family, before placing an order.
Technical Specifications
| Parameter | Specification |
|---|---|
| Main part numbers | 9000042021, 9000042027 |
| VW 911023 series | 111911023B, 111911023C, 111911023D, 111911023BT, 211911023, 311911023, 311911023B, 311911023C, 311911023DX |
| VW 000 series | 0001211013, 0001211014, 0001211992, 0001211997, 0001211998, 0001206006, 0001208006, 191211993, 498601055, 1130042027 |
| Bosch 9000 series | 9000042021, 9000042027, 9000082009, 90000820027, 90042001, 90042009 |
| Other cross | 16450N, 16450CN, 2-1340-BO, D8E158, E0343, MS1211012, 6004AA0021, AZ42034, 0986010530, 432543, 433269 |
| Voltage | 12V |
| Power | 0.8KW |
| Number of teeth | 9T |
| Engine | VW Beetle / Kaefer / Porsche air-cooled petrol |
| Quality | NEW |
| Warranty | 1 year |
| Net Weight | 2.9kg |
| Dimensions | 240 x 120 x 160mm |
| Packaging | Neutral kraft box |
| Lead Time | 30 days, pre-sale item |
Compatibility and Cross Reference
This starter motor fits the VW Beetle (Kaefer) and related Porsche air-cooled petrol models. Do not rely solely on the model name for fitment validation; always compare the original part number, mounting holes, gear teeth and connector configuration before ordering.
| Vehicle | Engine | Notes |
|---|---|---|
| VW Beetle / Kaefer | Air-cooled flat-four | Verify 12V 0.8KW 9T and OE number |
| Porsche (classic) | Air-cooled flat-four | Verify 12V 0.8KW 9T and OE number |
Multiple VW, Bosch and aftermarket OE numbers appear across production batches and regional market specifications for this same starter motor family. If your original unit bears one of the listed cross-reference numbers, 9000042021 serves as a direct drop-in replacement.
What to Look for in a Replacement
Follow these five verification steps before placing your order to avoid wrong-part returns:
1. Check the voltage and power label on your old starter: confirm it is rated for 12V 0.8KW. Other ratings are not interchangeable.
2. Count the drive-gear teeth: this unit uses 9T (9-tooth). Starters with a different tooth count are incompatible.
3. Confirm the platform is a VW Beetle, Kaefer or related Porsche air-cooled model. Other VW models may use different starter assemblies.
4. Compare the mounting holes, flange pattern and connector configuration with your original starter, and match OE numbers including the 311911023 family.
5. Weight cross-check: genuine matching unit weighs approximately 2.9 kg net; significant weight difference indicates wrong assembly.
Application Scenarios
Classic car specialists and VW Beetle restoration shops servicing air-cooled models across Europe, the Americas and Asia-Pacific.
Parts counters and jobbers stocking European vehicle replacement starting-system components for classic Volkswagens.
Enthusiasts restoring and maintaining original-spec Beetle, Kaefer and classic Porsche models.
Classic car exporters trading restored air-cooled VWs to global collector markets.
Cost-conscious buyers looking for a reliable new starter motor at a competitive price.
FAQ
Q: Which vehicles does this starter fit?
A: It is designed for the VW Beetle, Kaefer and related Porsche air-cooled petrol models. Confirm your model, engine code and OE number before ordering.
Q: Can I fit this starter onto other VW models?
A: No. Different VW engine families use different starter mounting patterns, drive-gear tooth counts and terminal layouts. Confirm your engine code before ordering.
Q: My old starter shows OE number 9000042027 or 311911023, will 9000042021 work?
A: Yes. These numbers belong to the same starter motor family for the Beetle air-cooled platform, differing only by production revision and market specification. It serves as a direct replacement.
Q: This item is listed as pre-sale, what is the delivery time?
A: This is a pre-sale item with a 30-day dispatch lead-time after order confirmation. A 1-year warranty applies from installation date.
Q: What is the correct operation after installation?
A: The engine should crank briskly and consistently on cold and hot starts. If the starter spins but the engine does not crank, check the drive-gear engagement and ring gear condition.
Q: What does your warranty cover?
A: A 1-year warranty applies from installation date; warranty excludes damage caused by mis-installation, incorrect wiring, water ingress, short circuit or physical damage.
In Practice
For technicians working on VW Beetle and Kaefer air-cooled platforms: Before removing the existing starter motor, confirm the engine is cold and the ignition is off, then disconnect the battery negative terminal first. Remove the battery cable from the B+ terminal of the solenoid, noting the correct orientation of each connection, and label or photograph the wiring before disconnecting.
Remove the mounting bolts supporting the starter motor and lower it from the bell-housing, taking care not to damage the flywheel ring gear or wiring. Compare the new starter against the old unit: verify mounting flange, bolt spacing, the 9-tooth drive gear and connector configuration. Clean the mounting surface, position the new starter, and tighten mounting bolts in stages to factory torque (typically 35-45 N.m). Reconnect the solenoid wiring and battery cable, ensuring terminals are clean and tight.
After installation, reconnect the battery and carry out a cranking test: the starter should engage promptly with a clean, crisp sound and no grinding or whine. Confirm the engine starts consistently on repeated attempts. Inexperienced home mechanics are recommended to entrust replacement work to a qualified auto-electric repair shop.
References
Parameters, vehicle applications and installation specifications are compiled based on VW official service documentation for the Beetle/Kaefer air-cooled platform, VW OEM and Bosch starter motor technical standards (9000042021, 9000042027), VW 911023-series and 000-series starter cross-reference data, and general automotive industry standards for starter motor installation, verified against actual vehicle installation tests and after-sales maintenance experience.
