Engine Rotating Assemblies & Rebuild Kits

Pro LS 4340 Rotating Assembly, 346 Cid., 3.898 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-R2436L8987

Not Yet Reviewed

Estimated Ship Date: Monday 9/8/2025

Pro LS 4340 Rotating Assembly, 370 Cid., 4.030 bore, 3.622 stroke, 58x, 6.098 rod, 12cc dish, 9.7:1 @ 65cc, 9.3:1 @ 70cc, File-Fit Rings, H Bearings

Part Number: SUM-R583603012

Not Yet Reviewed

Estimated Ship Date: Monday 9/8/2025

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

Not Yet Reviewed

Estimated Ship Date: Monday 9/8/2025

Pro LS Rotating Assembly, 371 Cid., 4.040 bore, 3.622 stroke, 58x, 6.098 rod, 2cc Flat Top, 10.9:1 @ 65cc, 10.3:1 @ 70cc, File-Fit Rings, H Bearings

Part Number: SUM-R58360402

Not Yet Reviewed

Estimated Ship Date: Monday 9/8/2025

Pro LS Rotating Assembly, 330 Cid., 3.810 bore, Standard 3.622 stroke, 58x, 6.098 rod, 2cc dome, 11:1 @ 61cc, 10.4:1 @ 65cc, File-Fit Rings, H Bearing

Part Number: SUM-R58368102

Not Yet Reviewed

Estimated Ship Date: Monday 9/8/2025

Pro LS 4340 Rotating Assembly, 415 Cid., 4.065 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-R244006521

Not Yet Reviewed

Estimated Ship Date: Monday 9/8/2025

Cylinder Kit, Forged Aluminum, 4.00mm Oversize Bore, KTM, Set

Part Number: CLW-51002-K01

Not Yet Reviewed

Estimated Ship Date: Sep 29, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0039

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0045

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0048

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, Suzuki, LT250R Quadracer, Kit

Part Number: HRI-CBK0065

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0080

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, Yamaha, YFM350 Raptor, YFM350X Warrior, Kit

Part Number: HRI-CBK0082

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, KTM, 65 SX, Kit

Part Number: HRI-CBK0085

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, Yamaha, Kit

Part Number: HRI-CBK0088

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0103

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, for use on Honda®, CRF450X, Kit

Part Number: HRI-CBK0105

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0106

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, KTM, 85 SX, Kit

Part Number: HRI-CBK0107

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0112

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0116

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, Polaris, 800, Kit

Part Number: HRI-CBK0123

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

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

Part Number: HRI-CBK0124

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, for use on Honda®, CRF250X, Kit

Part Number: HRI-CBK0126

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order

Rebuild Kit, Complete Bottom End, Kawasaki, Kit

Part Number: HRI-CBK0127

Not Yet Reviewed

Estimated Ship Date: Sep 19, 2025 if ordered today

• Drop Ship
• Free Shipping
• Special Order