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Use caution on the 300hp.I know of 2 of them that blew up at around 20hrs.The 250hp is a great motor.The 300hp from what I understand is having cylinder bore troubles because they changed the way they hone them.Has anyone heard of any failure on the 250hp and what was it?I have search the internet an have not found one, and from what I heard they have had zero failures in the field. 
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See the post 2 above
they had the same issues early but I haven't heard much lately other than nit picky stuff on both. I think the problems with the big Yam 2S was excellent timing for Evinrude and the ETEC.