Engine Rotating Assemblies & Rebuild Kits

Pro LS 4340 Rotating Assembly, 347 Cid., 3.903 bore, 3.622 stroke, 24X, 6.125 rod, 7cc dish, 9.7:1 @ 65cc, 9.4:1 @ 68cc, File-Fit Rings, H Bearings

Part Number: SUM-R2436L9037

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Pro LS 4340 Rotating Assembly, 416 Cid., 4.070 bore, 4.000 stroke, 24X, 6.125 rod, 6cc dish, 11.5:1 @ 65cc, 10.9:1 @ 70cc, File-Fit Rings, H Bearings

Part Number: SUM-R24400706

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Pro LS 4340 Rotating Assembly, 417 Cid., 4.075 bore, 4.000 stroke, 24X, 6.125 rod, 21cc dish, 9.9:1 @ 65cc, 9.5:1 @ 70cc, File-Fit Rings, H Bearings

Part Number: SUM-R244007521

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Pro LS 4340 Rotating Assembly, 417 Cid., 4.075 bore, 4.000 stroke, 24X, 6.125 rod, 6cc dish, 11.5:1 @ 65cc, 11:1 @ 70cc, File-Fit Rings, H Bearings

Part Number: SUM-R24400756

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Pro LS 4340 Rotating Assembly, 417 Cid., 4.080 bore, 4.000 stroke, 24X, 6.125 rod, 6cc dish, 11.6:1 @ 65cc, 11:1 @ 70cc, File-Fit Rings, H Bearings

Part Number: SUM-R24400806

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Pro LS 4340 Rotating Assembly, 359 Cid., 3.780 bore, 4.000 stroke, 24X, 6.125 rod, 5cc dish, 10.9:1 @ 61cc, 10.4:1 @ 65cc, File-Fit Rings, H Bearings

Part Number: SUM-R24407805

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BOTTOM END KIT Polaris

Part Number: HRI-HR00107

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Estimated Ship Date: Nov 12, 2025 if ordered today

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BOTTOM END KIT Polaris

Part Number: HRI-HR00118

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Estimated Ship Date: Nov 12, 2025 if ordered today

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BOTTOM END KIT Yamaha

Part Number: HRI-HR00124

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Estimated Ship Date: Nov 12, 2025 if ordered today

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Cylinder Kit, Forged Piston, Standard Bore, for use on Honda®, 10.50 to 1 Compression Ratio, Kit

Part Number: CLW-10003-K01

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Estimated Ship Date: Nov 24, 2025 if ordered today

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Cylinder Kit, Forged Aluminum, Standard Bore, for use on Honda®, Set

Part Number: CLW-10005-K01

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Estimated Ship Date: Nov 24, 2025 if ordered today

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Cylinder Kit, Forged Aluminum, Standard Bore, Kawasaki, KX250F, Set

Part Number: CLW-30006-K01

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Estimated Ship Date: Nov 24, 2025 if ordered today

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STANDARD BORE CYLINDER KIT

Part Number: CLW-30006-K02

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Estimated Ship Date: Nov 24, 2025 if ordered today

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STANDARD BORE CYLINDER KIT

Part Number: CLW-30011-K03

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Estimated Ship Date: Nov 24, 2025 if ordered today

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Cylinder Kit, Aluminum, 45.00mm Bore, KTM, Set

Part Number: CLW-50005

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Estimated Ship Date: Nov 24, 2025 if ordered today

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Rebuild Kit, Complete Bottom End, Yamaha, YFZ450, Kit

Part Number: HRI-CBK0098

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Estimated Ship Date: Nov 12, 2025 if ordered today

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Rebuild Kit, Complete Bottom End, Suzuki, RM85, Kit

Part Number: HRI-CBK0103

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Estimated Ship Date: Nov 12, 2025 if ordered today

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Rebuild Kit, Complete Bottom End, Yamaha, YFZ450, Kit

Part Number: HRI-CBK0109

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Estimated Ship Date: Nov 12, 2025 if ordered today

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COMPLETE BOTTOM END KIT

Part Number: HRI-CBK0145

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Estimated Ship Date: Nov 12, 2025 if ordered today

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Gasket Kit BOTTOM END KIT BOTTOM END KIT

Part Number: HRI-CBK0186

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Estimated Ship Date: Nov 12, 2025 if ordered today

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Rebuild Kit, Complete Bottom End, Kawasaki, Kit

Part Number: HRI-CBK0207

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Estimated Ship Date: Nov 12, 2025 if ordered today

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BOTTOM END KIT Polaris

Part Number: HRI-HR00109

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Estimated Ship Date: Nov 12, 2025 if ordered today

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BOTTOM END KIT Polaris

Part Number: HRI-HR00119

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Estimated Ship Date: Nov 12, 2025 if ordered today

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Gasket Kit BOTTOM END KIT BOTTOM END KIT

Part Number: HRI-CBK0074

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Estimated Ship Date: Nov 12, 2025 if ordered today

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Rebuild Kit, Complete Bottom End, Yamaha, YZ125, Kit

Part Number: HRI-CBK0090

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Estimated Ship Date: Nov 12, 2025 if ordered today

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