Wiseco Yamaha YZ 400 77-78/IT 40077-78 3405TD Piston Kit

Wiseco Yamaha YZ 400 77-78/IT 40077-78 3405TD Piston Kit

Marsoni

M251S

$159.00

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

Wiseco Yamaha YZ 400 77-78/IT 40077-78 3405TD Piston KitClassic Forged 2 stroke pistons are perfect for those looking to rebuild their 2 stroke engine with reliable, high quality components. These pistons cover a wide range of Powersports rebuilds, including vintage motocross models, classic street bikes, and snowmobiles. The forged material improves tensile strength over cast pistons, ensuring refreshed performance on the track or the trail. This Part Fits: Year Make Model Submodel 1977 1978 Yamaha IT400

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I noticed the engine running much quieter using this oil. The pour mouth is pretty unique for this brand, you can just open the interior cap, pull up the accordion neck and pour into the engine which provides better control over traditional wide mouth, thus less messy. This oil rarely goes on sale and is typically 1.5x to 2x more expensive than the more common US brands.

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Reviewed in the United States on August 28, 2025

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Cooch

Fort Morgan, US

★★★★★ 5

Best synthetic oil BMW

Excellent synthetic oil BMW 328I

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Reviewed in the United States on February 6, 2026

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Malu buys everything

Port Orchard, US

★★★★★ 5

Last long

Love it ! Since I have a BMW this oil it’s good for it . The Price is good . Last long . No engine noise Or oil burning. Even the color looks good after 3 months.

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Reviewed in the United States on March 9, 2026

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Brian Classen

West Palm Beach, US

★★★★★ 5

FRIENDLY REMINDER Don't overtighten the bolts

MUCH better than the cheap plastic OEM part, Just a reminder though, these thread into an aluminum block so be very careful to start them finger tight first, then evenly tighten both bolts to push the fitting into the chamber. If you don't, it will slightly misalign and you run the risk of stripping the threads. The one comes with the replacement o ring, and be sure to get some antifreeze on that seal prior to attempting to push it into the chamber. IT IS A TIGHT FIT, but that's what you want, so just be careful. You might also want an extra hose clamp on hand, as the one that came with this began to bend as it got tight, so I had to replace it for peace of mind. Overall, great product though.

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Reviewed in the United States on January 9, 2026

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Dklnyc

Phoenix, US

★★★★★ 5

Strong product

Great quality

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Reviewed in the United States on March 11, 2026