WSM Piston Kit Yamaha 75-90 Hp 4-Stroke '16-'22 STD SIZE 81mm 100-310K 6FP-11631

WSM Piston Kit Yamaha 75-90 Hp 4-Stroke '16-'22 STD SIZE 81mm 100-310K 6FP-11631

Marsoni

M251S

$139.19

Get it in 3 business days with 1 day shipping. Friday, May 29

WSM Piston Kit Yamaha 75-90 Hp 4-Stroke '16-'22 STD SIZE 81mm 100-310K 6FP-11631Item#: 100 310K Piston Kit Yamaha 75 90 Hp 4 Stroke 16 22 STD OEM#: 6FP 11631 00 00, 6FP 11631 01 00Note: 81mm Brand: WSM FITMENTS: Make Model Year(s) Yamaha 4 Cyl 4 Stroke 75 2017 2022 Yamaha 4 Cyl 4 Stroke 90 2016 2022 Yamaha 4 Cyl Jet 4 Stroke 90 2017 2022

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For context, I’m a seasoned woodworker and always evaluate tools with the price in mind. This seemed like a good deal and in fact when it arrived, it looked and felt like reasonable quality for the price. Unhappily, the first bookshelf I drilled was off from side to side by almost 3 mm which would make a really wobbly shelf situation. It took a while to figure out what was happening, but I finally realized the metal bushings that guide the drill bit are so soft that they cored out from contact with the bit even though I was cautious to not put the bit in under power but to get it in the bushing and aligned before drilling. Still, the bushings started angling immediately. So when you then use those angled bushings to set the pin for the next series, it’s off by a little bit. Then the next is off by a little more…. By the time I drilled holes up and down a 6’ high shelf, the bushings were out of square, the holes were 3 mm out of alignment, and the shelf sides were firewood. Back to the drawing board and this goes in the trash, I’m afraid.

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Reviewed in the United States on May 3, 2026