Bosch Starter Motor 12V 11 Tooth CW Part No. 1986S00859

This Bosch starter motor is a 12V unit with 11 teeth, clockwise rotation and part number 1986S00859. It is listed as a starter motor for the rotating electrical group, with a 2.1kW power rating, 76mm flange diameter and two mounting bores.

The unit uses an M10 mount hole diameter, has an overall length of 227mm and a pinion at rest measurement of 25mm. These are the key dimensions to check alongside the vehicle application, especially where starter clearance and mounting pattern need to match the original unit.

Bosch describes this starter motor as being designed in fit and performance to meet OE starters, with premium starting performance and durability for harsh environments. It is supplied as a single each unit and carries a 12 month warranty.

Key Features

• 12V starter motor
• 11 tooth pinion
• Clockwise rotation
• 2.1kW power rating
• 76mm flange diameter
• 2 mounting bores

Specifications

• Brand: Bosch
• Product type: Starter motor
• Voltage: 12V
• Power rating: 2.1kW
• Number of teeth: 11
• Rotation: CW
• Flange diameter: 76mm
• Overall length: 227mm

Fitment guidance

• Listed fitment references include BMW applications.
• Fitment data supplied covers BMW 1 Series, BMW 2 Series, BMW 3 Series, BMW 4 Series, BMW 5 Series, BMW X1, BMW X3, BMW X4 and BMW Z4 families.
• Sample application references include BMW 1 2012, 2013, 2014, 2015 and 2016.
• Use the part number 1986S00859 and the physical measurements to confirm the correct replacement before ordering.

Application and Buying Notes

Before you buy, match the part number 1986S00859, the 12V electrical specification and the 11 tooth clockwise configuration against the starter you are replacing. Starter motors are commonly chosen by a combination of voltage, rotation, pinion tooth count, flange diameter and mounting pattern, so these details matter as much as the vehicle badge.

The key fit checks here are the 76mm flange diameter, 227mm overall length, M10 mount hole diameter and two mounting bores. If any of those differ from the original starter, the unit may not bolt up or align correctly, even if the vehicle appears in a broad BMW listing.

The 2.1kW rating is a useful comparison point when you are replacing a starter motor with a similar output requirement. It is also worth confirming whether the vehicle uses a dry clutch application, as listed here, and comparing the pinion at rest dimension of 25mm with the existing unit before purchase.

Bosch notes this starter motor is designed to meet OE starters in fit and performance. That makes the physical checks important, because the safest way to order is to compare the old unit, the part number, and the vehicle application together rather than relying on one detail alone.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number 1986S00859 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type STARTER MOTOR, Unit of Measure EACH, Warranty 12 Months, Mount Hole Diameter M10, Overall Length 227mm, Power Rating 2.1kW, Voltage 12, Number of mounting bores 2, Packaging width 18, Manufactured in China.

Additional published details for cross-checking include Product Group 1 ROTATING ELECTRICAL, Part No. 1986S00859, Brand BOSCH, Description Bosch Starter Motor 12V 11Th CW, Flange Diameter 76mm, Number of Teeth 11, Pinion at Rest 25mm, Rotation CW, Wet / Dry Clutch Dry, Packaging length 32.5.

Bosch Starter Motor 12V 11Th CW. Part number 1986S00859 should be checked first. Listed voltage is 12. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 1986S00859, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a starter motor in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include BMW 1, BMW 1 2012, BMW 1 2013, BMW 1 2014. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

Compatibility note: Confirm compatibility using part number 1986S00859, the 12V 11 tooth CW configuration, and the listed measurements before fitting. Vehicle application data supplied references BMW models, but final fitment should always be checked against the existing starter and the vehicle’s exact application details.

FAQ

What type of part is this?

This is a Bosch starter motor, listed under rotating electrical. It is a 12V unit with 11 teeth and clockwise rotation. For this listing, part number 1986S00859 is the main reference point. Listed voltage is 12. Published fitment references include BMW 1, BMW 1 2012, BMW 1 2013. These details should still be checked against the original unit before ordering.

What is the part number?

The part number supplied is 1986S00859. For this listing, part number 1986S00859 is the main reference point. Listed voltage is 12. Published fitment references include BMW 1, BMW 1 2012, BMW 1 2013. These details should still be checked against the original unit before ordering.

What are the main dimensions?

The listed dimensions include a 76mm flange diameter, 227mm overall length, M10 mount hole diameter and 25mm pinion at rest. For this listing, part number 1986S00859 is the main reference point. Listed voltage is 12. Published fitment references include BMW 1, BMW 1 2012, BMW 1 2013. These details should still be checked against the original unit before ordering.

How many mounting bores does it have?

It has 2 mounting bores. For this listing, part number 1986S00859 is the main reference point. Listed voltage is 12. Published fitment references include BMW 1, BMW 1 2012, BMW 1 2013. These details should still be checked against the original unit before ordering.

What vehicles are mentioned in the fitment data?

The supplied fitment references include BMW applications, with BMW 1, BMW 2, BMW 3, BMW 4, BMW 5, BMW X1, BMW X3, BMW X4 and BMW Z4 families mentioned. For this listing, part number 1986S00859 is the main reference point. Listed voltage is 12. Published fitment references include BMW 1, BMW 1 2012, BMW 1 2013. These details should still be checked against the original unit before ordering.

What warranty is listed?

A 12 month warranty is listed for this starter motor. For this listing, part number 1986S00859 is the main reference point. Listed voltage is 12. Published fitment references include BMW 1, BMW 1 2012, BMW 1 2013. These details should still be checked against the original unit before ordering.