If you run a Suzuki engine that is similar to the configuration of Yamaha it will only consume 189 liters per hour while running at 3000rpm.
Yamaha jet boat engine reliability. Thats a lot of rpm - much more so than the standard mercruiser IO that I currently own. Adequate stockholding of critical spare parts is essential in the marine industry. Yamaha engines are very reliable.
This newly developed engine is called the SVHO or Super Vortex High Output. The ROTAX 4 stroke engine is not perfect either but it has proven to be a very reliable user friendly powerplant. This post is about common issues with the classic style Yamaha jet boats years 2003-2009 with four stroke MR1 High output or non-HO engines.
I have the MR1 on my waverunner and it has been perfect but I maintain it religiously. This engine is said to deliver 20 more power and torque than the original SHO. SBT is the preferred source for standard Yamaha PWC engines.
I realize that Yamaha is well known for their reliability but if I have my facts straight it sounds as though these engines will spin at 7K-10K rpm at cruising speeds. Compared to Yamaha Suzuki comes out very impressive at fuel consumption. These are great boats that were the transition from the 2-stroke rockets to the family run abouts.
If your refering to 4 stroke engines Yamaha has had some reliability problems. Beyond PWCs they also offer boat and outboard engines too. I have had boats my whole life with every engine style there is.
Compared with the outboard and sterndrive the jet boat engine is mechanically simple. However huge asterisk - i dont know anything about this 18 motor. Adequate stockholding of critical spare parts is essential in the marine industry.