There were several oil pump recalls,depending on the serial number on the engine. Yamaha has a service bulletin out that says if you have a HPDI 2-Stroke with one of the following oil pumps you need to get it replaced. Have someone that knows about yamaha's do a compression test on all cylinders as well as a visual inspection for any heat related issues.
-oil pumps with s/n 60v10, 60v11, or 60v12 will need to be replaced with s/n 60v13
-oil pumps with s/n 60v0, 60v01, or 60v02 will need to be replaced with s/n 60v03
-oil pumps with s/n 6d000. 6d001, 6d002, or 6d003 will need to be replaced with 6d004
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