The Marine Knowledge Network
Field write-ups from real jobs - what broke, what fixed it, torque specs and part numbers included. Ask it a question; specs answer inline.
11 articles for “four-stroke”
Two-Stroke vs Four-Stroke Oil: What Goes Where and Why It Matters
... Marine four-strokes run long hours at constant high load and live in humid ...
Yamaha F-Series Four-Stroke Winterization
## Scope Applies broadly to Yamaha F-series four-strokes (F25 through F350). Always confirm ...
Outboard Compression Testing: How to Do It and Read the Results
... Two adjacent low cylinders on a four-stroke: possible head gasket. - Zero on one ...
Suzuki DF Lower Unit Oil Change and Water Intrusion Signs
... change on a Suzuki DF-series four-stroke is a fifteen-minute job, but ...
Honda BF-Series Carburetor Cleaning
## When to suspect the carbs Honda BF-series four-strokes (especially BF8–BF90 carbureted ...
Sea-Doo Winterization Step by Step
... 5. **Oil change** on four-stroke models — store on fresh oil, never used. Check ...
Quoting a Repower: The Mobile Mechanic's Guide
... A modern four-stroke can be substantially heavier than the old two-stroke it ...
Spring Recommissioning Checklist: Outboard Boats
... Confirm engine oil level/condition on four-strokes; change it if it wasn't ...
Submerged PWC / Water Ingestion: The First 48 Hours Matter
... Drain and refill the oil on four-strokes — expect a milkshake; plan on repeat ...
Reading Marine Spark Plugs: A Diagnosis in Your Hand
... idle-only use. - **Black, wet, oily (four-stroke):** oil in the cylinder — rings or ...
Outboard Fuel Pump Diagnosis: Lift Pumps, VSTs, and Primer Bulbs
... and by cam/pulse on many four-strokes. Symptoms of a torn diaphragm: fuel ...