Bosch Starter Motor 12V 9T CCW 1.1KW - Part No. 1986S00657

Bosch starter motor, 12V, 9-tooth, counter-clockwise rotation, rated at 1.1kW, part number 1986S00657. It is a new starter motor supplied as each unit, with a 12 month warranty and a 2-hole starter mount type.

The key physical checks on this unit are the 76mm flange diameter, 225mm overall length, 29.5mm pinion diameter, and 27.5mm pinion at rest. Mount hole diameter is 10mm and mount centre to centre is 105mm, so it is important to compare the starter housing and mounting points against the vehicle application before ordering.

This Bosch starter motor is listed for Lombardini applications, including 25LD425-2 and 25LD425-2 1987. Because starter motors must match the mounting pattern, rotation, tooth count, voltage and pinion dimensions, the part number and application details should be checked carefully against the existing unit.

Key Features

• 12V starter motor
• 9-tooth pinion
• CCW rotation
• 1.1kW power rating
• New unit
• 2-hole starter mount

Specifications

• Brand: Bosch
• Product type: Starter motor
• Part No.: 1986S00657
• Voltage: 12V
• Power rating: 1.1kW
• Rotation: CCW
• Number of teeth: 9
• Starter mount type: 2 hole

Confirmed fitment

• Lombardini 25LD425-2
• Lombardini 25LD425-2 1987

Application and Buying Notes

Before buying, match the starter against the current unit on the engine and confirm the Bosch part number 1986S00657, 12V electrical system, 9-tooth pinion, and CCW rotation. Those are the main identifiers for avoiding a mismatch when replacing a starter motor.

The mounting details also matter. This starter uses a 2-hole mount, 2 mounting bores, 10mm mount hole diameter, 105mm mount centre to centre, and a 76mm flange diameter. If any of those measurements differ from the removed starter, the part should be re-checked before fitment.

The listed Lombardini applications cover 25LD425-2 and 25LD425-2 1987, but starter compatibility still depends on the exact engine configuration and the existing unit fitted to the machine. Compare the overall length of 225mm and the pinion dimensions of 29.5mm diameter and 27.5mm at rest to the unit being replaced.

For buying with confidence, use the part number first, then check the mounting pattern, tooth count, voltage and rotation. That approach is especially important on rotating electrical parts, where a unit can look close yet still differ in fit or engagement.

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 1986S00657 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 10, Overall Length 225mm, Pinion Diameter 29.5mm, Rotation CCW, Voltage 12, New / Reman. New, Number of mounting bores 2.

Additional published details for cross-checking include Packaging width 16.7, Manufactured in Hungary, Product Group 1 ROTATING ELECTRICAL, Part No. 1986S00657, Brand BOSCH, Description Bosch Starter Motor 12V 9Th CCW, Flange Diameter 76mm, Number of Teeth 9, Pinion at Rest 27.5mm, Power Rating 1.1kW.

Bosch Starter Motor 12V 9Th CCW. Part number 1986S00657 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 1986S00657, 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 LOMBARDINI 25LD425-2, LOMBARDINI 25LD425-2 1987. 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: Please confirm fitment using part number 1986S00657, the 12V/9-tooth/CCW specification, and the listed mounting and pinion dimensions before ordering.

FAQ

What voltage is this starter motor?

It is a 12V starter motor. For this listing, part number 1986S00657 is the main reference point. Listed voltage is 12. Published fitment references include LOMBARDINI 25LD425-2, LOMBARDINI 25LD425-2 1987. These details should still be checked against the original unit before ordering.

What is the Bosch part number?

The part number is 1986S00657. For this listing, part number 1986S00657 is the main reference point. Listed voltage is 12. Published fitment references include LOMBARDINI 25LD425-2, LOMBARDINI 25LD425-2 1987. These details should still be checked against the original unit before ordering.

Is this starter motor new or remanufactured?

It is listed as new. For this listing, part number 1986S00657 is the main reference point. Listed voltage is 12. Published fitment references include LOMBARDINI 25LD425-2, LOMBARDINI 25LD425-2 1987. These details should still be checked against the original unit before ordering.

What rotation does this starter use?

This starter rotates counter-clockwise (CCW). For this listing, part number 1986S00657 is the main reference point. Listed voltage is 12. Published fitment references include LOMBARDINI 25LD425-2, LOMBARDINI 25LD425-2 1987. These details should still be checked against the original unit before ordering.

Which engines are listed as fitment?

Listed fitment includes Lombardini 25LD425-2 and Lombardini 25LD425-2 1987. For this listing, part number 1986S00657 is the main reference point. Listed voltage is 12. Published fitment references include LOMBARDINI 25LD425-2, LOMBARDINI 25LD425-2 1987. These details should still be checked against the original unit before ordering.

What mounting style does it use?

It uses a 2-hole starter mount with 2 mounting bores, a 10mm mount hole diameter, and 105mm mount centre to centre. For this listing, part number 1986S00657 is the main reference point. Listed voltage is 12. Published fitment references include LOMBARDINI 25LD425-2, LOMBARDINI 25LD425-2 1987. These details should still be checked against the original unit before ordering.