Bosch Starter Motor 12V 10 Tooth CCW Part No. 1986S00778

The Bosch Starter Motor 12V 10 Tooth CCW is a rotating electrical component sold as a single unit, with part number 1986S00778. It is a 12 volt starter motor with 10 teeth and counter-clockwise rotation, and it carries a 12 month warranty. For buyers matching an existing starter, those details are the main checks before ordering.

This unit has 2 mounting bores and is manufactured in Hungary. The packaging dimensions are 32.5 cm long, 18 cm wide, and 13.9 cm high, which can be useful when handling or storing the part before installation. The product is listed under rotating electrical and starter motors, which helps keep the application clear.

Bosch states the unit is manufactured to the same rigorous production standard as OE parts and developed with optimised internals for maximum starting cycles and service life. Bosch also notes more than 100 years of experience and OE supply to many vehicle manufacturers. Those are useful quality markers, but the correct fit still depends on matching the part number, voltage, tooth count, rotation, and mounting style to the vehicle application.

Key Features

• 12V starter motor
• 10 tooth pinion
• CCW rotation
• 2 mounting bores
• Supplied as each
• 12 month warranty

Specifications

• Type: Starter motor
• Brand: Bosch
• Part No.: 1986S00778
• Voltage: 12
• Number of teeth: 10
• Rotation: CCW
• Number of mounting bores: 2
• Warranty: 12 months

Fitment guidance

• Confirmed fitment data includes Porsche 911 applications.
• Fitment preview covers Porsche 911 model years 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 and 1999.
• Use the part number 1986S00778, along with 12V, 10 tooth, CCW rotation and 2 mounting bores, to verify the correct match before purchase.

Application and Buying Notes

For a starter motor, the most important checks are the part number, voltage, tooth count, rotation direction and mounting bore count. This Bosch unit is 12V, 10 tooth, CCW, and has 2 mounting bores, so it should only be considered where those details match the vehicle’s original starter requirements. Matching the external shape alone is not enough on a rotating electrical part.

The supplied fitment information points to Porsche 911 applications, including model years from 1988 through 1997 and 1999 in the previewed data. Even so, it is still best practice to confirm the existing unit against Bosch part number 1986S00778 and compare the installed starter’s pinion count and rotation before ordering. That is the safest way to avoid a mismatch on a part with multiple possible configurations.

Bosch identifies this starter as built to OE-level production standards and designed for long service life and dependable starting cycles. Those are relevant considerations if the vehicle is used regularly or in demanding conditions, but they do not replace fitment verification. If the old starter is still available, compare the label, mounting pattern, and electrical specification with the 12V 10 tooth CCW details listed here before fitting.

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 1986S00778 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, Rotation CCW, Number of mounting bores 2, Packaging width 18, Manufactured in Hungary, Product Group 1 ROTATING ELECTRICAL, Part No. 1986S00778, Brand BOSCH.

Additional published details for cross-checking include Description Bosch Starter Motor 12V 10Th CCW, Number of Teeth 10, Voltage 12, Packaging length 32.5, Packaging height 13.9, Product Group 2 STARTER MOTORS.

Bosch Starter Motor 12V 10Th CCW. Part number 1986S00778 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 1986S00778, 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 PORSCHE 911, PORSCHE 911 1988, PORSCHE 911 1989, PORSCHE 911 1990. 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.

The listed warranty is 12 Months. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Always confirm compatibility by matching part number 1986S00778, 12V specification, 10 tooth count, CCW rotation, and the 2-mounting-bore layout against the vehicle’s existing starter and application details before purchase.

FAQ

What is the part number for this Bosch starter motor?

The part number is 1986S00778. For this listing, part number 1986S00778 is the main reference point. Listed voltage is 12. Published fitment references include PORSCHE 911, PORSCHE 911 1988, PORSCHE 911 1989. These details should still be checked against the original unit before ordering.

What voltage is this starter motor?

It is a 12 volt starter motor. For this listing, part number 1986S00778 is the main reference point. Listed voltage is 12. Published fitment references include PORSCHE 911, PORSCHE 911 1988, PORSCHE 911 1989. These details should still be checked against the original unit before ordering.

How many teeth does it have?

It has 10 teeth. For this listing, part number 1986S00778 is the main reference point. Listed voltage is 12. Published fitment references include PORSCHE 911, PORSCHE 911 1988, PORSCHE 911 1989. These details should still be checked against the original unit before ordering.

What does CCW mean for this starter?

CCW means counter-clockwise rotation. For this listing, part number 1986S00778 is the main reference point. Listed voltage is 12. Published fitment references include PORSCHE 911, PORSCHE 911 1988, PORSCHE 911 1989. These details should still be checked against the original unit before ordering.

What fitment information is provided?

The supplied fitment information includes Porsche 911 applications, with previewed model years 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 and 1999. For this listing, part number 1986S00778 is the main reference point. Listed voltage is 12. Published fitment references include PORSCHE 911, PORSCHE 911 1988, PORSCHE 911 1989. These details should still be checked against the original unit before ordering.

What warranty is listed?

The listed warranty is 12 months. For this listing, part number 1986S00778 is the main reference point. Listed voltage is 12. Published fitment references include PORSCHE 911, PORSCHE 911 1988, PORSCHE 911 1989. These details should still be checked against the original unit before ordering.