Lower Unit Assy Short Shaft 6AU-45300-00-8D for 4 Stroke 9.9HP YAMAHA Outboard

Genuine Replacement Lower Unit Assembly (Short Shaft)

For Yamaha 4-Stroke 9.9HP Outboards
OEM #: 6AU-45300-00-8D

Key Specifications

  • Shaft Length: Short (15")

  • Application: 4-Stroke Models Only

  • Gear Ratio: 2.15:1 (Standard)

  • Oil Capacity: 6.8 oz (200ml)

  • Construction: Marine-grade aluminum alloy

Product Features

✔ Complete Assembly - Includes gears, shafts, and seals pre-installed
✔ OEM-Equivalent - Matches Yamaha engineering specifications
✔ Pressure Tested - Verified watertight integrity
✔ Corrosion-Resistant - Saltwater-compatible finish

Warranty: 1-Year Limited Warranty

Compatibility

Fits:
• Yamaha F9.9FMHA (2018-Present)
• Yamaha F9.9JMHL (2015-2017)
• Compatible with most 9.9HP 4-stroke models

Verification Required For:

  • Tiller vs. Remote Control models

  • Special edition/saltwater series

What's Included

• (1) Complete gearcase assembly
• Drain/fill screw washers
• Installation instructions

Note: Does not include propeller or shift linkage

Why Choose This Lower Unit?

✅ Direct Replacement - No modifications needed
✅ Pre-Lubricated - Ready for immediate installation
✅ Quality Assurance - 100% bench-tested before shipping
✅ US Stock - Fast delivery from domestic warehouses

Professional Installation Tips

🔧 Recommended:

  • Replace water pump impeller during installation

  • Use Yamaha Gearcase Oil (recommended)

  • Torque mounting bolts to 29 lb-ft (40 Nm)

  • Pressure test after installation

Need Fitment Help?

📋 Provide:

  1. Engine model & serial number (located on bracket)

  2. Current shaft length measurement

  3. Photos of existing unit if available

Our marine technicians respond within 2 business hours.

TDKTECH is a fast-growing auto parts supplier. Although we are a new store on eBay, but we have been in this field since 2008.  All of our products are factory direct sale, and you can get the most favorable price with the best quality.  We supply a broad range of premium OEM replacements and modified parts.  Our major products are shock absorber, catalytic converter, transfer case, tailgate strut, etc... It fits for GM, Mercedes-Benz, Audi, BMW, Land Rover etc. We have our own warehouse in USA, German and Britain, which make it more quicker and easier for our transaction.  

1. Compatible vehicle is only for reference. Please check the part number/OEM number.

2. Please find a professional rapair store for any installment.

3. The taxes are not included in the price. Buyers have to pay import tarriffs and other taxes.

 

1. Orders will usually be handled within 2 working days from the nearest warehouse (We have domestic warehouses in CA, GA, IL, MA, NJ) by UPS/FedEx/USPS.

2. For international orders, it will be shipped within 3 working days by DHL, Fedex or UPS, and take 3-7 working days to be delivered.

3. Please note the tax will be paid by buyers. For any damaged package, please just contact us, we will resend or do our best to serve you the best solutions.

1. One year warranty. Please contact us before you open a return request. We promise we will offer you the best solutions and make you satisfied.

2. If the item can’t work, we will send a replacement to you. When applying a warranty issue, please kindly send us photos and video as our requirement.

1. We accept return in 60 days.

2. Please communicate with us before you open an eBay return request. Our after-sales team will do their best to give you the best solutions and give you happy return experience.

3. Please make sure the item are not used and be returned with it’s original packaging, please keep the original packing material until you assure the products are perfectly fit for your car and you will not return them.

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