Engine Rotating Assemblies & Rebuild Kits

Pro LS 4340 Piston and Rod Kit, 416 Cid., 4.070 bore, 4.000 stroke, 6.125 rod, 6cc dish, 11.5:1 @ 65cc, 10.9:1 @ 70cc, File-Fit Rings

Part Number: SUM-PR400706

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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 13, 2026 if ordered today

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Powersports Bottom End Engine Kit, HOT ROD COMPLETE BOTTOM END KT SPORTSMAN 700

Part Number: HRI-CBK0226

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Gasket Kit HOT ROD COMP BOTTOM END KIT BA HOT ROD COMP BOTTOM END KIT BA NSHEE 350

Part Number: HRI-CBK0044

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Estimated Ship Date: Feb 13, 2026 if ordered today

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BOTTOM END KIT Honda

Part Number: HRI-CBK0042

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Estimated Ship Date: Feb 13, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, for use on Honda®, TRX450R, TRX450ER, Kit

Part Number: HRI-CBK0106

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, for use on Honda®, Kit

Part Number: HRI-CBK0001

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, KTM, Kit

Part Number: HRI-CBK0006

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, Yamaha, YZ85, Kit

Part Number: HRI-CBK0076

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Estimated Ship Date: Feb 13, 2026 if ordered today

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BOTTOM END KIT

Part Number: HRI-CBK0052

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, Yamaha, YFM66F, YXR66F, Kit

Part Number: HRI-CBK0116

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, for use on Honda®, CRF250R, Kit

Part Number: HRI-CBK0119

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Estimated Ship Date: Feb 12, 2026 if ordered today

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BOTTOM END KIT Yamaha

Part Number: HRI-CBK0015

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, Suzuki, Kit

Part Number: HRI-CBK0225

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Estimated Ship Date: Feb 13, 2026 if ordered today

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Pro LS 4340 Piston and Rod Kit, 370 Cid., 4.030 bore, 3.622 stroke, 6.125 rod, 12cc Dish, 9.7:1 @ 65cc, 9.3:1 @ 70cc, File-Fit Rings

Part Number: SUM-PR36L03012

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Pro LS Piston and Rod Kit, 325 Cid., 3.780 bore, Standard 3.622 stroke, 6.125 rod, 7cc dish, 9.7:1 @ 61cc, 9.3:1 @ 65cc, File-Fit Rings

Part Number: SUM-PR36L7807

4.0 out of 5 stars ( 3 )

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Rebuild Kit, Complete Bottom End, Kawasaki, Kit

Part Number: HRI-CBK0053

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Rebuild Kit, Complete Bottom End, for use on Honda®, CR250R, Kit

Part Number: HRI-CBK0031

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BOTTOM END KIT Polaris

Part Number: HRI-HR00110

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Rebuild Kit, Complete Bottom End, Kawasaki, KX125, Kit

Part Number: HRI-CBK0091

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COMPLETE BOTTOM END KIT

Part Number: HRI-CBK0097

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, for use on Honda®, Kit

Part Number: HRI-CBK0111

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, Suzuki, LT-R450 QuadRacer, Kit

Part Number: HRI-CBK0112

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Estimated Ship Date: Feb 12, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, for use on Honda®, CRF450R, Kit

Part Number: HRI-CBK0124

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Estimated Ship Date: Feb 12, 2026 if ordered today

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COMPLETE BOTTOM END KIT

Part Number: HRI-CBK0145

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Estimated Ship Date: Feb 12, 2026 if ordered today

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