★★★★★ 5
Works as it should
Works as it should
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 24, 2026
WSM Yamaha 350 Banshee 1987-2006 Big Bore Head Gasket 20-103-05
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
WSM Yamaha 350 Banshee 1987-2006 Big Bore Head Gasket 20-103-05Yamaha 350 Banshee 1987 2006 Big Bore Head Gasket Note: 66. 5 68mm BIG BORE Brand : WSM Item #: 20 103 05 Make Model CC HP Year Yamaha Banshee 350 1987 Yamaha Banshee 350 1988 Yamaha Banshee 350 1989 Yamaha Banshee 350 1990 Yamaha Banshee 350 1991 Yamaha Banshee 350 1992 Yamaha Banshee 350 1993 Yamaha Banshee 350 1994 Yamaha Banshee 350 1995 Yamaha Banshee 350 1996 Yamaha Banshee 350 1997 Yamaha Banshee 350 1998 Yamaha Banshee 350 1999 Yamaha Banshee
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Based on 1922 reviews
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Product Reviews
★★★★★ 4
Four Stars
Just what I needed
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 14, 2016
★★★★★ 5
Functioned as advertized.
Installed these in my Whalers 96 200 Offshore. No issues, used permatex gasket compound on aluminum engine parts after cleaning with fine brass wire wheel.
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Reviewed in the United States on November 20, 2024
★★★★★ 5
Fits 1988 Sea Ray V-135 2 stroke (Mercury)
For those of you with the 135 hp
mercury that was branded as the "Sea Ray 135" and paint matched to the boat (i.e. Seville's and some others) this is the 147 degree thermostat for that motor. My Seville is an '88 and It's difficult to cross reference the serial numbers on those motors when searching for parts. Only buy Quicksilver parts for these motors. Happy to find them on Amazon because Boats.net as an example, is not clear on what you're getting.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 3, 2024
★★★★★ 5
fixed issue
stopped the overheat issue on my outboard!!!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 6, 2025
