Yamaha a (10)! Dam I got a good laugh out of that one. Tell that to all the HPDI owners with constant plug fouling problems, lower head problems. Tell that to the Yamaha 4-stroke motors owners who are lucky to see 75-80% of the advertised horsepower.
There are no (10) motors out there, none are perfect. The Suzuki is a great motor, I am on my 3rd 4-stroke in 3-yrs. A 15,115, and now a 140. Never had a issue with any of them, putting in high hours of use on all. If you do an internet search of 4-stroke comparisons, you will find that the Suzuki has won all the head to head comparisons, and was the only 4-stroke manufacturer achieving the advertised hp in testing...I can't speak of their 2-strokes, never owned one.
There are alot of "Great" motors out there but none are perfect!