2012 Engine Kits & Rotating Assemblies

Pro LS 4340 Piston and Rod Kit, 364 Cid., 3.810 bore, 4.000 stroke, 6.125 rod, 5cc dish, 11:1 @ 61cc, 10.5:1 @ 65cc, File-Fit Rings

Part Number: SUM-PR408105

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Pro LS 4340 Piston and Rod Kit, 378 Cid., 4.080 bore, 3.622 stroke, 6.125 rod, 2cc dome, 11.6:1 @ 65cc, 10.9:1 @ 70cc, File-Fit Rings

Part Number: SUM-PR36L0802

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Big Bore Kit, 107 in., Drop-In, 3.937 in. Bore, Wrinkle Black Cylinders with Highlighted Fins, Harley-Davidson®, Kit

Part Number: SSY-910-0500

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Estimated Ship Date: Feb 27, 2026 if ordered today

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Cylinder Kit, Forged Piston, 5.00mm Oversize Bore, Polaris, 10.60 to 1 Compression Ratio, Kit

Part Number: CLW-61001-K01

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Estimated Ship Date: Feb 27, 2026 if ordered today

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Cylinder Kit, Forged Aluminum, 3.00mm Oversize Bore, Yamaha, YFZ450, Set

Part Number: CLW-23001-K01

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Estimated Ship Date: Feb 27, 2026 if ordered today

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Cylinder Kit, Forged Aluminum, Standard Bore, Yamaha, Set

Part Number: CLW-20001-K01

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Estimated Ship Date: Feb 27, 2026 if ordered today

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Complete Engine Rebuild Kit, Stock Bore, Stock Stroke, KTM, Kit

Part Number: VPX-WR101-056

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Estimated Ship Date: Feb 26, 2026 if ordered today

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Powersports Bottom End Engine Kit, HOT ROD COMPLETE BOTTOM END KT TRX420FM / TM

Part Number: HRI-CBK0219

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Estimated Ship Date: Feb 17, 2026 if ordered today

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Repair Kit, Top End, 40.000mm Bore, 6.00 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NX-40005K

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Estimated Ship Date: Feb 27, 2026 if ordered today

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Standard Bore Cylinder Kit, Forged Piston, 78mm Bore, for use on Honda®, Motorcycle, Kit

Part Number: CLW-10001-K01

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Estimated Ship Date: Feb 27, 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: Feb 27, 2026 if ordered today

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Cylinder Head NAMURA TOP END REPAIR KIT NAMURA TOP END REPAIR KIT

Part Number: NTI-NA-20005-2K

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Repair Kit, Top End, 48.450mm Bore, 9.20 to 1 Compression Ratio, Kawasaki, Kit

Part Number: NTI-NX-20085K

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Estimated Ship Date: Feb 27, 2026 if ordered today

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Repair Kit, Top End, 81.96mm Bore, 9.00 to 1 Compression Ratio, Arctic Cat, Suzuki, Kit

Part Number: NTI-NA-30010K

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Complete Engine Rebuild Kit, Stock Bore, Stock Stroke, 11.70 to 1 Compression, for use on Honda®, Kit

Part Number: VPX-WR101-178

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Cylinder Kit, Forged Aluminum, Standard Bore, Yamaha, Set

Part Number: CLW-20104-K01

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Cylinder Kit, Forged Aluminum, 3.00mm Oversize Bore, Yamaha, Set

Part Number: CLW-21003-K02

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Cylinder Kit, Forged Aluminum, 3.00mm Oversize Bore, Yamaha, Set

Part Number: CLW-21004-K01

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Cylinder Kit, Aluminum, 77.00mm Bore, Kawasaki, Set

Part Number: CLW-30006

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2MM BIG BORE CYLINDER KIT

Part Number: CLW-31011-K01

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Top End Engine Kits CYL WORKS STD BORE KIT HI COMP CYL WORKS STD BORE KIT HI COMP 800 SPORSTMAN/RZR/RANGER

Part Number: CLW-60002-K02HC

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Repair Kit, Top End, 82.950mm Bore, 9.50 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NA-40005K

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Repair Kit, Top End, 83.500mm Bore, 8.60 to 1 Compression Ratio, Yamaha, Kit

Part Number: NTI-NA-40006-2K

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Repair Kit, Top End, 93.47mm Bore, 10.20 to 1 Compression Ratio, Polaris, Kit

Part Number: NTI-NA-50004-6K

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Repair Kit, Top End, 84.98mm Bore, 9.30 to 1 Compression Ratio, Kawasaki, Kit

Part Number: NTI-NA-20075-CK

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