i’ve owned a few Yamaha brand covers, the larger ones are awesome.
the one for my T9.9 kicker is horrible, and i recommend against buying it. the fit is loose and there doesn’t seem to be any good way to snug it down. it will definitely flap at highway speeds and i’d worry about micro-scratches on the cowling over time.
the Yamaha brand covers for the F150 and F200 fit more snugly than any aftermarket ones i’ve seen, and the inside is nicely lined with a soft material. there’s no moving or chafing. for the F150 on my last boat, i used the cover for every long trip for 4 years and that motor still looked brand new. i bought one for the F200 on my new boat this spring and it fits that motor equally well. i love the fact that i don’t have to try and get bugs off the front of the motor cowling…