Mercury Racing 90-8M0146888 Service Manual 250R 300R 300R HD

Complete Mercury Racing factory service manual # 90-8M0146888 for 250R, 300R & 300R HD outboards.

Starting Mercury outboard engine serial number for this manual is 1E080503. 

Manual Outline 

1 - Important Information
A - Master Specifications
B - Maintenance
C - General Information
D - Outboard Installation 250R/300R Models
E - Outboard Installation 300R HD
F - Storage
G - General Troubleshooting

2 - Electrical
A - Ignition
B - Charging and Starting System
C - Accessories
D - Throttle and Shift

3 - Fuel System
A - Induction System
B - Service Procedures
C - Emissions

4 - Powerhead
A - Cylinder Block/Crankcase
B - Cylinder Head
C - Lubrication D - Cooling

5 - Midsection
A - Transom Bracket and Driveshaft Housing
B - Conventional Midsection (CMS) Tri-Ram Power Trim
C - Heavy Duty Midsection with Remote Trim Pump
D - Upper and Lower Cowls

6 - Gear Housing
A - Right-Hand and Left-Hand Rotation (5.44 in. Diameter)
B - Torque Master
C - Right-Hand and Left-Hand Rotation Sport Master

7 - Steering
A - Power Steering
B - Hydraulic Steering
C - Tie Bar Kits
D - 300R HD Models with Builder Supplied Steering Systems
E - Power Steering Wiring Diagrams Important Information

8 - Color Diagrams
A - Color Diagrams