2003 Honda BF135A / BF150A Outboard Motor Service Manual (P/N 07506-3000001)

• Covers 2003 Honda BF135A and BF150A 4-stroke outboard motors, including Long (L) and Extra-long (XL) shaft variants with optional trim/tilt and counter-rotation configurations
• Official Honda Motor Co., Ltd. publication from November 2003
• Contains 47 detailed exploded-view component diagrams, 55 electrical and wiring schematic charts, and 5 exhaustive torque-specification reference tables
• Serves as the primary factory reference for the BF135A/BF150A launch series, detailing the specific VTEC variable valve timing implementation on the 150 HP model

Engine and Chassis Documentation

At 692 pages, this publication breaks down the construction, function, and service parameters for the Honda BF135A and BF150A outboards. It moves systematically from basic service rules into deep-dive diagnostic chapters. You will find extensive sections on programmed fuel injection, alternator testing, and complete engine disassembly. The documentation covers the DOHC cam drive system and cylinder head servicing in detail. It also maps out the unique independent cylinder head block cooling architecture.

Specification and Reference Data

Expect precise technical data for internal clearances, gear case oil capacities, and valve adjustment settings. Cylinder head bolt torque values follow a strict multi-stage sequence, specifying final-stage angles of 278°. The specification tables list intake valve clearance at 0.21–0.25 mm and a total cooling system capacity of 7.35 liters. For complex diagnostics, the manual provides PGM-FI and alert system sensor tables to help correctly interpret ECU fault codes. Working on marine powerheads involves inherent physical risks. Always rely on the complete OEM documentation and proper workshop protocols before beginning any hands-on maintenance or disassembly.