The SIM YAMAHA tech department receives requests asking “what is this squealing noise”—especially one that comes and goes, often noticeable at idle or low RPMs after the engine warms up or following a run—is a very common issue on many Yamaha four-stroke outboards in the F40 to F350 range (including popular models like the F115, […]
Category: Lower Unit Tips
Running In a Bucket -How Deep is Deep Enough?
Have you ever tried running your outboard motor in a tank, barrel, or large bucket? As the photo shows the water pump—specifically the impeller—is located at the top of the gearcase (lower unit), just above the gear housing but below the powerhead/exhaust area. While the pump can sometimes draw water upward if the level is […]
Why is my Outboard Overheating?
A overheating outboard can happen for a variety of reasons. If you have ever noticed a lack of water coming from the cooling water pilot hole (also called the “overboard discharge indicator” or ODI or “pisser” or telltale) on your outboard, here are a few tips that can help you quickly analyze the situation. TIP […]
Lower Unit Gaskets
New type gaskets are being used on lower unit drain and oil level screws for all Yamaha outboard models beginning with January 2016 production. Yamaha is also supplying these new gaskets as replacement parts for all current and previous models; the previous part number supersedes to the new one. IMPORTANT These new-type black gaskets have […]