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STG51297 Starter Drive Pinion Gear 0255840 220-21017 for Mercury 35HP 40HP Outboard Motors | 10T CCW Replacement

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PRODUCT DETAILS

STG51297 Starter Drive Pinion Gear 0255840 220-21017 for Mercury 35HP 40HP Outboard Motors | 10T CCW Replacement

Part Numbers

United Technologies: 0255840 / 0255840-DV30SM / DV02558

Arrowhead: SAB5318 / 220-21017

J&N: 220-21017

Product Description

The STG51297 Starter Drive Pinion Gear is a new aftermarket replacement drive assembly designed for compatible starter applications used with Mercury 35HP and 40HP outboard motors.

This drive features a 10-tooth pinion gear, counterclockwise (CCW) rotation, a 7-spline configuration, and a nut on the back of the drive. It is designed to engage the compatible starter and engine flywheel system during starting.

The unit cross-references United Technologies 0255840, Arrowhead SAB5318, and J&N 220-21017. Confirm the original drive part number, gear dimensions, spline count, and rotation direction before ordering.

Product Specifications

Specification	Details
Product SKU	STG51297
Product Type	Starter Drive / Pinion Gear Assembly
Part Type	Drive
Condition	New Aftermarket Part
Rotation Direction	Counterclockwise (CCW)
Number of Gear Teeth	10T
Gear Outside Diameter	31mm
Gear Inside Diameter	12.2mm
Overall Length	36.7mm
Number of Splines	7
Additional Feature	Nut included on the back of the drive
Compatible Starter Brand	United Technologies
Estimated Net Weight	0.2kg

OEM / Cross Reference Numbers

Brand / Category	Reference Part Numbers
United Technologies	0255840, 0255840-DV30SM, DV02558
Arrowhead	SAB5318, 220-21017
J&N	220-21017

Compatible Applications

Make	Equipment Type	Model / Application	Horsepower	Fitment Details
Mercury	Outboard Motor	35HP Outboard	35HP	Verify original starter drive and dimensions
Mercury	Outboard Motor	40HP Outboard	40HP	Verify original starter drive and dimensions

PRODUCT HIGHLIGHTS

Product Highlights

Precise Gear Dimensions	7-Spline Drive Design	Mercury Outboard Applications
10 teeth, 31mm gear OD, 12.2mm gear ID, and 36.7mm overall length	Counterclockwise rotation with a rear retaining nut	Listed for compatible Mercury 35HP and 40HP outboard starter applications

SHIPPING

Item Details

Processing Time Orders are processed within 1-3 business days after payment confirmation

Shipping Methods DHL/UPS/ FedEx/ TNT/ Air Freight/ Sea Freight

Estimated Delivery Time Express shipping: 3-7 business days, depending on destination

Packaging Export-standard cartons with protective inner packing

Tracking Tracking number will be provided once the order is shipped

Shipping Cost Calculated based on weight, dimensions, and destination

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WARRANTY POLICY

All new aftermarket parts come with a 1-Year warranty. Quality is the first thing we consider. Check out our Warranty Assistance for more details.

SHIPPING POLICY

We offer express and standard shipping options to ensure your off-road machine gets back in action—fast and reliably. For more details, please visit our Shipping Policy .

EASY RETURN POLICY

We prioritize your satisfaction. If your order doesn't meet your expectations within 90 days, you may be eligible for a refund. See our Easy Return Policy for details.

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