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New Crankshaft Main Bearing And Seal Kit Compatible With 1988-1998 Yamaha Yz 250 249Cc 2-Stroke

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K228A1
OEM PART NUMBERS:
• Yamaha: 93306-30530-00 (Crankshaft Main Bearing — primary, 2x required per engine)
• Yamaha: 93102-25008-00 (Crankshaft Oil Seal Left — primary)
• Yamaha: 93102-25088-00 (Crankshaft Oil Seal Right — alternate)
• Catalog Kit Reference: K228

SPECIFICATIONS:
• Type: Crankshaft Main Bearing and Oil Seal Kit
• Application: Bottom-End Rebuild / Crankshaft Replacement
• Engine Coverage: Yamaha YZ 250 + WR 250 249cc 2-Stroke Single-Cylinder Pre-1999 Generation
• Engine Displacement: 249cc
• Bore × Stroke: 68mm × 68mm (varied slightly by year)
• Engine Code: Yamaha YZ 250 / WR 250 2-Stroke Pre-1999 Generation
• Year Range: YZ 250 1988-1998 (11-year run) / WR 250 1991-1997 (7-year run)
• Cylinder Configuration: Single-Cylinder Inline 2-Stroke Liquid-Cooled
• Power Valve: YPVS (Yamaha Power Valve System) Exhaust Power Valve
• Transmission: 5-Speed Manual (YZ 250 = Close-Ratio / WR 250 = Wide-Ratio)
• Fuel Delivery: Mikuni TM38/VM38 38mm Carburetor
• Induction: Reed-Valve
• Lubrication: Premix (No Separate Oil Injection)
• Starter: Kick-Start (No Electric Start)
• Kit Contents: 2x Crankshaft Main Bearings (Prelubed and Packaged with Waterproof Grease), 2x Crankshaft Oil Seals (Left and Right) with Sealing Lip
• YZ 250 vs WR 250: YZ = motocross / WR = woods-enduro (same engine bottom-end, different gearing/suspension)
• Use: Compatible with Yamaha OEM and aftermarket replacement crankshafts
• Condition: New

APPLICATIONS:
• Yamaha YZ 250 2-Stroke Liquid-Cooled Motocross (1988-1998, 11-Year Production Run)
• Yamaha WR 250 2-Stroke Liquid-Cooled Woods/Enduro (1991-1997, 7-Year Production Run)
• 249cc 2-stroke single-cylinder liquid-cooled, 68mm × 68mm bore × stroke
• YPVS (Yamaha Power Valve System), Mikuni TM38/VM38 carburetor, reed-valve induction
• 5-speed manual transmission, kick-start, premix lubrication
• DOES NOT FIT Pre-1988 / 1999-2000 (use K011) / 2001+ Yamaha YZ 250, YZ 250F 4-stroke (use K021), WR 250F 4-stroke, WR 250R/X Dual Sport, or YZ 125

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

Was: $209.11
Sale: $119.49
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Description

YAMAHA YZ 250 250CC 2-STROKE MOTOCROSS — Pre-1999 Generation 11-Year Production Run (1988-1998):
• Yamaha YZ 250 249cc 2-Stroke Liquid-Cooled Single-Cylinder Motocross (1988, Modernized YZ250 Platform — YPVS Standardized)
• Yamaha YZ 250 (1989, Continued Production)
• Yamaha YZ 250 (1990, Continued Production)
• Yamaha YZ 250 (1991, Continued Production)
• Yamaha YZ 250 (1992-1993, Continued Production)
• Yamaha YZ 250 (1994-1995, Mid-Generation Refinements)
• Yamaha YZ 250 (1996-1997, Continued Production)
• Yamaha YZ 250 (1998, FINAL Year of Pre-1999 Generation — 1999 Brought Next-Generation Redesign with K011 Kit)

YAMAHA WR 250 250CC 2-STROKE WOODS/ENDURO (1991-1997):
• Yamaha WR 250 249cc 2-Stroke Liquid-Cooled Single-Cylinder Woods/Enduro (1991, LAUNCH Year of WR 250 2-Stroke — Off-Road Counterpart of YZ 250)
• Yamaha WR 250 (1992-1993, Continued Production)
• Yamaha WR 250 (1994-1995, Mid-Generation Refinements)
• Yamaha WR 250 (1996, Continued Production)
• Yamaha WR 250 (1997, FINAL Year of WR 250 2-Stroke — Discontinued After 1997)

NOTES:
• Compatible with Yamaha OEM crankshafts and aftermarket replacement crankshafts
• Yamaha YZ 250 = legendary 250cc 2-stroke motocross bike, one of the longest-running 2-strokes ever made (continued production into 2024+)
• YZ 250 platform spans pre-1988 → 1988-1998 (THIS KIT) → 1999-2000 (K011) → 2001+ (newer kits)
• 1988 was the year YPVS (Yamaha Power Valve System) was standardized on the YZ 250
• 1998 was the FINAL year of this generation — 1999 brought next-generation redesign
• WR 250 was the off-road/enduro counterpart of YZ 250
• WR 250 differences from YZ 250: wide-ratio gearing, softer suspension, 18" rear wheel, lights/horn, side stand
• Both YZ 250 and WR 250 share the same engine bottom-end (different state of tune)
• 249cc 2-stroke single-cylinder liquid-cooled
• 68mm × 68mm bore × stroke (varied slightly by year)
• Mikuni TM38/VM38 38mm carburetor
• YPVS (Yamaha Power Valve System) exhaust power valve — Yamaha's signature 2-stroke power valve technology
• Reed-valve induction
• 5-speed manual transmission
• Kick-start (no electric start)
• Premix lubrication (no separate oil injection)
• Highly sought-after by 2-stroke motocross and woods/enduro enthusiasts and vintage MX racers
• DOES NOT FIT Pre-1988 Yamaha YZ 250 (earlier generation)
• DOES NOT FIT 1999-2000 Yamaha YZ 250 (use K011 kit) — next-generation redesign
• DOES NOT FIT 2001+ Yamaha YZ 250 (different bearing platform)
• DOES NOT FIT Yamaha YZ 250F 4-Stroke (different engine entirely, use K021)
• DOES NOT FIT Yamaha WR 250F 4-Stroke (different engine entirely, use K021)
• DOES NOT FIT Yamaha WR 250R / WR 250X Dual Sport / Supermoto (different engine, use K021)
• DOES NOT FIT Yamaha YZ 125 (different displacement, smaller)
• Quality alternative to expensive Yamaha OEM crankshaft bearings and seals
• Recommended for any bottom-end rebuild, crankshaft replacement, or seal-out repair

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  • 2.0 lbs.
  • W9.0000” x H0.8000” x L12.0000”
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