Engine Rotating Assemblies & Rebuild Kits

Pro LS 4340 Piston and Rod Kit, 346 Cid., 3.898 bore, 3.622 stroke, 6.125 rod, 3cc dome, 11:1 @ 65cc, 10.6:1 @ 68cc, File-Fit Rings

Part Number: SUM-PR36L8983

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Pro LS Piston and Rod Kit, 371 Cid., 4.040 bore, 3.622 stroke, 6.125 rod, 2cc Flat Top, 10.9:1 @ 65cc, 10.3:1 @ 70cc, File-Fit Rings

Part Number: SUM-PR36L0402

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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: Mar 31, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, Kawasaki, Suzuki, Kit

Part Number: HRI-CBK0048

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Estimated Ship Date: Mar 30, 2026 if ordered today

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Gasket Kit BOTTOM END KIT BOTTOM END KIT

Part Number: HRI-CBK0092

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Estimated Ship Date: Mar 30, 2026 if ordered today

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Pro LS 4340 Piston and Rod Kit, 415 Cid., 4.065 bore, 4.000 stroke, 6.125 rod, 21cc dish, 9.9:1 @ 65cc, 9.5:1 @ 70cc, File-Fit Rings

Part Number: SUM-PR4006521

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Pro LS 4340 Piston and Rod Kit, 360 Cid., 3.785 bore, 4.000 stroke, 6.125 rod, 5cc dish, 10.9:1 @ 61cc, 10.4:1 @ 65cc, File-Fit Rings

Part Number: SUM-PR407855

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COMPLETE BOTTOM END KIT

Part Number: HRI-CBK0190

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Estimated Ship Date: Mar 31, 2026 if ordered today

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Pro LS Piston and Rod Kit, 371 Cid., 4.040 bore, 3.622 stroke, 6.098 rod, 2cc Flat Top, 10.9:1 @ 65cc, 10.3:1 @ 70cc, File-Fit Rings

Part Number: SUM-PR360402

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Pro LS 4340 Piston and Rod Kit, 416 Cid., 4.070 bore, 4.000 stroke, 6.125 rod, 21cc dish, 9.9:1 @ 65cc, 9.5:1 @ 70cc, File-Fit Rings

Part Number: SUM-PR4007021

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BOTTOM END KIT Yamaha

Part Number: HRI-HR00124

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Estimated Ship Date: Mar 31, 2026 if ordered today

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Pro LS 4340 Piston and Rod Kit, 377 Cid., 4.070 bore, 3.622 stroke, 6.125 rod, 2cc dome, 11.6:1 @ 65cc, 10.9:1 @ 70cc, File-Fit Rings

Part Number: SUM-PR36L0702

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

Part Number: HRI-CBK0043

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Estimated Ship Date: Mar 31, 2026 if ordered today

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

Part Number: HRI-CBK0016

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Estimated Ship Date: Mar 30, 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: Mar 31, 2026 if ordered today

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

Part Number: HRI-CBK0106

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Estimated Ship Date: Mar 30, 2026 if ordered today

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BOTTOM END KIT Honda

Part Number: HRI-CBK0042

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Estimated Ship Date: Mar 31, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, Yamaha, YZ250F, Kit

Part Number: HRI-CBK0087

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Estimated Ship Date: Mar 31, 2026 if ordered today

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Pro LS Piston and Rod Kit, 332 Cid., 3.820 bore, Standard 3.622 stroke, 6.125 rod, 2cc dome, 11:1 @ 61cc, 10.5:1 @ 65cc, File-Fit Rings

Part Number: SUM-PR36L8202

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Estimated Ship Date: Apr 13, 2026 if ordered today

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BOTTOM END KIT

Part Number: HRI-CBK0013

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Estimated Ship Date: Mar 30, 2026 if ordered today

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Rebuild Kit, Complete Bottom End, Yamaha, YZ250, Kit

Part Number: HRI-CBK0135

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Estimated Ship Date: Mar 30, 2026 if ordered today

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Gasket Kit BOTTOM END KIT BOTTOM END KIT

Part Number: HRI-CBK0014

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Estimated Ship Date: Mar 31, 2026 if ordered today

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Pro LS 4340 Piston and Rod Kit, 383 Cid., 3.903 bore, 4.000 stroke, 6.125 rod, 5cc dish, 10.9:1 @ 65cc, 10.6:1 @ 68cc, File-Fit Rings

Part Number: SUM-PR409035

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Rebuild Kit, Complete Bottom End, Yamaha, YFZ 350 Banshee, Kit

Part Number: HRI-CBK0039

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Estimated Ship Date: Mar 31, 2026 if ordered today

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