Potentiometers

Most people are familiar with the use of potentiometers even if they don’t know them by name. They are a simple form of a voltage divider that can be used in a circuit to send a varying voltage signal that is a fraction of the input voltage. The throttle position sensor (TPS) is one of […]


Metal Gaskets

Many Yamaha motors use metal gaskets between major components, such as cylinder heads and the crankcase, as well as the crankcase-to-upper-casing exhaust guide. Most of these metal gaskets use factory-applied surface coatings and raised ribs to seal between components. There is no need to apply additional sealant when reassembling components. In fact, when additional sealant […]


Yamaha Paint Codes

Yamaha uses coding to signify their paint colors on different parts of their outboard motors.  These paint codes are referenced in the chart below, but can often be found in the last two digits of the part number of certain items, for example a lower unit: Note the “8D” code in the part number below.  […]


Yamaha Four Stroke Maintenance Schedule

Yamaha recommends service intervals based on “typical” use that includes operating at varied speeds, sufficient time for the engine warm up and cool down, medium to light and average cruising speed near 3000 to 4000 rpm range.  If your normal operating conditions are different, more frequent services should be considered, especially engine oil and gear […]


Which trim and tilt cap wrench do I need?

We receive this question many times a day. We wish it were as cut and dry as ordering the wrench listed in your service manual for your motor, but it’s not that simple. We’ve found that the caps used on motors from the factory don’t always match what is listed as the replacement on the […]


Removing Water Pump Anti-Knock Spring Retainer

Located above the water pump impeller on many two stroke and four stroke models, 115 hp~250 hp, there are two wave washers and a flat washer underneath a plastic spacer and metal retaining collar. These components minimize driveshaft movement, up and down, to quiet the knock sometimes heard at low speeds. They must be removed […]