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New Crankshaft Main Bearing And Seal Kit Compatible With 2004-2023 Kawasaki Kx250f 249Cc 4-Stroke

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K043A1
OEM PART NUMBERS:
• Kawasaki: 92049-1403 (Crankshaft Oil Seal — primary, shared with Suzuki K9204-91403)
• Suzuki: K9204-91403 (Crankshaft Oil Seal — primary, identical to Kawasaki 92049-1403)
• Kawasaki: 92049-7011 (Crankshaft Oil Seal — alternate)
• Kawasaki: 92049-7004 (Crankshaft Oil Seal — alternate)
• Kawasaki: 92049-0030 (Crankshaft Oil Seal — alternate, TC30 40 7)
• Kawasaki: 92046-1281 (Crankshaft Main Bearing — primary, 2x required per engine)
• Catalog Kit Reference: K043

SPECIFICATIONS:
• Type: Crankshaft Main Bearing and Oil Seal Kit
• Application: Bottom-End Rebuild / Crankshaft Replacement
• Engine Coverage: Kawasaki KX250F (2004-2023) / Suzuki RM-Z250 (2004-2006) 4-Stroke Single-Cylinder Liquid-Cooled
• Engine Displacement: 249cc
• Bore × Stroke: 77mm × 53.6mm (early production)
• Engine Code: KX250F (Kawasaki) / RJ41A (Suzuki)
• Year Range: Kawasaki KX250F 2004-2023 / Suzuki RM-Z250 2004-2006 (Shared Engine Era ONLY)
• Cylinder Configuration: Single-Cylinder Inline 4-Stroke Liquid-Cooled DOHC 4-Valve
• Transmission: 5-Speed
• Bearing Rating: High-Speed C3 Rated
• Kit Contents: 2x Crankshaft Main Bearings (Prelubed and Packaged with Waterproof Grease), 2x Crankshaft Oil Seals (Left and Right) with Sealing Lip
• Models Covered: Kawasaki KX250F Motocross (2004-2023, Full Production Era), Suzuki RM-Z250 Motocross (2004-2006, Shared Engine Era ONLY)
• Use: Compatible with Kawasaki/Suzuki OEM and Hot Rods aftermarket crankshafts
• Condition: New

APPLICATIONS:
• Kawasaki KX250F 4-Stroke 249cc DOHC Motocross (2004-2023)
• Suzuki RM-Z250 4-Stroke 249cc DOHC Motocross (2004-2006 ONLY — shared engine era)
• Joint Kawasaki-Suzuki 250cc 4-stroke motocross development platform
• DOES NOT FIT 2007 and Newer Suzuki RM-Z250 — different bottom-end required (Suzuki redesigned independently)

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

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Description

KAWASAKI KX250F 4-STROKE MOTOCROSS — 249cc Single-Cylinder Liquid-Cooled DOHC (2004-2023):
• Kawasaki KX250F 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2004, LAUNCH Year — Joint Kawasaki-Suzuki Development)
• Kawasaki KX250F 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2005-2008, First-Generation Era)
• Kawasaki KX250F 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2009-2010, Refined Production)
• Kawasaki KX250F 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2011-2016, Modern Production Era)
• Kawasaki KX250F 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2017-2020, Continued Modern Production)
• Kawasaki KX250F 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2021-2023, Final Production Era — Renamed to KX250 in Some Markets)
• Kawasaki KX250F 77mm Bore × 53.6mm Stroke 4-Stroke Race-Spec Motocross

SUZUKI RM-Z250 4-STROKE MOTOCROSS — 249cc Single-Cylinder Liquid-Cooled DOHC (2004-2006 ONLY):
• Suzuki RM-Z250 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2004, LAUNCH Year — Joint Kawasaki-Suzuki Development)
• Suzuki RM-Z250 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2005, Continued Production)
• Suzuki RM-Z250 249cc 4-Stroke DOHC 4-Valve Liquid-Cooled Motocross (2006, FINAL Year of Shared Engine — 2007+ RM-Z250 Uses Suzuki-Specific Bottom-End)
• RJ41A engine code variant

NOTES:
• Compatible with Kawasaki/Suzuki OEM crankshafts and aftermarket Hot Rods replacement crankshafts
• 2004 was the LAUNCH year of BOTH bikes — Kawasaki and Suzuki jointly developed the 250cc 4-stroke motocross platform via a partnership
• Same bottom-end engine architecture across both brands for 2004-2006 (this is why a single kit fits both)
• 2007+ Suzuki RM-Z250 uses different bottom-end (covered by separate kit) — Suzuki redesigned independently after 2006
• Kawasaki KX250F continued with this bottom-end architecture into the 2020s
• Quality alternative to expensive Kawasaki/Suzuki OEM main bearings and crankshaft seals
• Recommended for any bottom-end rebuild, crankshaft replacement, or seal-out repair
• High-speed C3 rated bearings; bearings prelubed and packaged with waterproof grease
• Crank seals feature sealing lip designed to reduce crank pin wear
• 5-speed transmission, DOHC 4-valve cylinder head

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  • Item Requires Shipping
  • 2.0 lbs.
  • W9.0000” x H0.8000” x L12.0000”
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