Welcome to the SIM Yamaha Blog


4.2L Timing Belt Replacement

The normal timing belt replacement interval on a 4-stroke outboard is 1000 hours or five years, whichever comes first. But an engine might need a service-related procedure that requires timing belt removal before then. This article deals with the safe removal and re-installation of the timing belt. Gain access to the belt by removing the […]


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 […]


Coming Soon! MyYamahaOutboards App

This spring, Yamaha will launch MyYamahaOutboards, an all new web portal and mobile app. It will give Yamaha Outboard owners an account-based view of all recorded maintenance history while providing additional notifications about upcoming key maintenance intervals. These platforms will link to Maintenance Tracking used by dealers to give Yamaha Outboard owners a personalized view […]


Yamaha 10 Pin Harness

Yes, the Yamaha wire color coding can be confusing! For people that don’t work on electrical systems regularly, this can be frustrating even when doing seemly easy service procedures. The 10-pin motor-to-boat harness connector is one of those items that can trip you up. We felt a simple color code chart and 10-pin connector layout […]


Keep Your Motor Running With A Healthy Fuel System

The largest source of trouble with marine engines these days lies with the fuel and fuel system. Paying regular attention to both can help prevent major headaches down the road. From hoses and connections to proper filtration and even fuel additives, time spent maintaining your fuel system helps keep you safe and your boat ready […]


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.  […]


HPDI Fuel Injector Gasket Installation

Many times when the HPDI Cylinder Head Side Gasket pictured below are removed for injector service, not much attention is paid to the orientation of the gaskets until the new ones need to be installed.  When the injectors are removed from the cylinder head, the old injector gasket material needs to be cleaned from the […]