Today’s modern fuel systems can be trickier than ever before. However, most affected owners complain that these kits are expensive. When Yamaha became aware of this design defect, they created a kit that affected owners could buy. Hence the 3 year warranty period that Yamaha offers is often up before the customer notices this defect. The main problem with this type of corrosion is that it can go unnoticed for many years. This corrosion can lead to holes in the exhaust system, which can eventually cause horsepower, smoking, and engine failure. This problem coating affected earlier models and allowed hot exhaust fumes to corrode the exhaust pipes instead of preventing this corrosion. It is believed that this corrosion is caused by a manufacturing or design defect relating to the coating used for the exhaust components. Yamaha 150 outboard engine owners have complained about severe corrosion and pitting in their exhaust systems, leading to premature engine failure. If you suspect your Harmonic Balancer is failing, contact your Yamaha dealer and have your engine inspected by a professional. Symptoms to look out for a failed Harmonic Balancer include excessive engine vibrations, hearing a high-pitched whine, seeing misaligned timing marks, and belts falling off. While the new design is more reliable, some users still complain about the Harmonic Balancer failing in later models. As soon as Yamaha became aware of the problem, they modified the design of this component. This problem seems to be more associated with the older, 2004, and 2005 models. If the Hamonic Balancer fails, your outboard engine will begin to vibrate excessively, which can cause internal damage to your engine. The Harmonic Balancer or HB is a part of the engine that acts as a shock absorber to remove any unwanted vibration caused by the crank-shaft movement within your engine. Failure Issues With The Harmonic Balancer (HB) The following are the 5 most common problems with Yamaha 150 outboard engines to look out for: 1. However, just like with any other boat engine manufacturer, problems do arise. They have a reputation for building one of the most reliable outboard engines on the market. Yamaha Marine has been a leader in the business of developing and building outboard motors for many years. The Yamaha F150 quickly became one of the most popular engines around, with Yamaha themselves boasting that it is “the best-selling 150hp four-stroke engine of all time.” This 150hp engine was designed to satisfy the needs of the recreational boating community looking for a quieter engine with fuel-efficient power for small to mid-sized boats. Yamaha Marine released its new F150 four-stroke outboard engine to the market in 2004. General Pros & Cons Of A Yamaha 150HP Outboard Engine.

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