YAMAHA Engine Kits & Rotating Assemblies

Repair Kit, Top End, 66.360mm Bore, 10.90 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NX-40025-BKA

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Estimated Ship Date: May 8, 2026 if ordered today

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Top End Engine Kits CYL WORKS STD BORE POWER VALVE CYL WORKS STD BORE POWER VALVE YZ250 '99-15

Part Number: CLW-CW-PV-K01

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Estimated Ship Date: May 7, 2026 if ordered today

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Repair Kit, Top End, 100.470mm Bore, 9.20 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NA-40010-2K

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Estimated Ship Date: May 8, 2026 if ordered today

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Repair Kit, Top End, 84.420mm Bore, 9.10 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NA-40008K

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Estimated Ship Date: May 8, 2026 if ordered today

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TOP END REPAIR KIT

Part Number: NTI-NA-40007-4K

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Estimated Ship Date: May 8, 2026 if ordered today

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QB FULL TOP END SET

Part Number: QDB-56-4293

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Estimated Ship Date: May 4, 2026 if ordered today

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TOP END GASKET KIT, TOP END REPAIR KIT (FORGED PISTON)

Part Number: NTI-FX-40045K2

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Estimated Ship Date: May 8, 2026 if ordered today

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TOP END KIT FORGED 76.95/STD YAM

Part Number: NTI-FX-40050K

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Estimated Ship Date: May 7, 2026 if ordered today

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TOP END GASKET KIT, TOP END REPAIR KIT (FORGED PISTON)

Part Number: NTI-FX-40037K

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Estimated Ship Date: May 8, 2026 if ordered today

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Repair Kit, Top End, 67.94mm Bore, 10.60 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NX-40026K

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Estimated Ship Date: May 8, 2026 if ordered today

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TOP END REPAIR KIT

Part Number: NTI-NX-40026-CKA

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Estimated Ship Date: May 8, 2026 if ordered today

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Repair Kit, Top End, 84.950mm Bore, 10.00 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NA-40011-2K

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Estimated Ship Date: May 8, 2026 if ordered today

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Repair Kit, Top End, 83.450mm Bore, 9.50 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NA-40005-2K

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Estimated Ship Date: May 8, 2026 if ordered today

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TOP END REPAIR KIT

Part Number: NTI-NA-40010-6K

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Estimated Ship Date: May 8, 2026 if ordered today

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