A selection of replacement parts for OS Engines®. These parts are not original parts unless otherwise stated in the descriptions. Please check your choices thoroughly.
Add the quantities required for each item, then click "Add to Cart" before proceeding to the next page
| Replacement Parts | Price | Quantity | ||
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- Replaces - OS Engines® FSR RC W-Muffler - 50: BB 20-37-9 OS Engines® FSR Ring RN - 108: BB 20-37-9 OS Engines® RX - 21: BB 20-37-9 OS Engines® RX-2 Cycle - 15: BB 20-37-9 OS Engines® RX-EFI - 21: BB 20-37-9 OS Engines® RX-FI - 140: BB 20-37-9 OS Engines® FSR RC W-Muffler - 50: Bearing - Stainless Bearing Sealed Option OS Engines® FSR Ring RN - 108: Bearing - Stainless Bearing Sealed Option OS Engines® RX - 21: Bearing - Stainless Bearing Sealed Option OS Engines® RX-2 Cycle - 15: Bearing - Stainless Bearing Sealed Option OS Engines® RX-EFI - 21: Bearing - Stainless Bearing Sealed Option OS Engines® RX-FI - 140: Bearing - Stainless Bearing Sealed Option Replacement Part: S6904-2RS (PK-20) Double black rubber sealed standard stainless steel bearing Single Row Ball Bearings - 20x37x9 mm Unflanged - Stainless Steel AISI 440C Bearing |
$546.95
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Temporarily Out Of Stock
-> Backorder now for delivery around Aug 13, 2026
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- Replaces - OS Engines® 108 FSR - 2 Stroke: BB 20-37-9 OS Engines® RX140: BB 20-37-9 OS Engines® 108 FSR - 2 Stroke: Replacement Rear Bearing - Standard Bearing OS Engines® RX140: Replacement Rear Bearing - Standard Bearing Replacement Part: 6904 (Each) Open standard bearing Single Row Ball Bearings - 20x37x9 mm Unflanged - Chrome Steel SAE 52100 Bearing |
$13.05
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Temporarily Out Of Stock
-> Backorder now for delivery around May 26, 2026
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- Replaces - OS Engines® 108 FSR - 2 Stroke: BB 20-37-9 OS Engines® F320 4 Cylinder RC - 4 Stroke: BB 20-37-9 OS Engines® F4 4-C - 320: BB 20-37-9 OS Engines® F4 4CYL - 32: BB 20-37-9 OS Engines® FF240 4 Cylinder RC - 4 Stroke: BB 20-37-9 OS Engines® FSR RC W-Muffler - 40: BB 20-37-9 OS Engines® FSR Ring RN - 50: BB 20-37-9 OS Engines® FT 12 Twin RC 4C - 45: BB 20-37-9 OS Engines® FT Twin 120 II - 45: BB 20-37-9 OS Engines® FT Twin RC 4C - 12: BB 20-37-9 OS Engines® FT Twin RC 4C - 120: BB 20-37-9 OS Engines® FT12011 Twin RC - 4 Stroke: BB 20-37-9 OS Engines® FT160 Twin RC - 4 Stroke: BB 20-37-9 OS Engines® Old FF 4 CYL - 61: BB 20-37-9 OS Engines® Old FT Twin 4C - 240: BB 20-37-9 OS Engines® Old FT Twin 4C - 25: BB 20-37-9 OS Engines® RX - 21: BB 20-37-9 OS Engines® RX140: BB 20-37-9 OS Engines® RX-2 Cycle - 15: BB 20-37-9 OS Engines® RX-EFI - 140: BB 20-37-9 OS Engines® RX-FI - 21: BB 20-37-9 OS Engines® 108 FSR - 2 Stroke: Replacement Rear Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® F320 4 Cylinder RC - 4 Stroke: Replacement Rear Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® F4 4-C - 320: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® F4 4CYL - 32: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FF240 4 Cylinder RC - 4 Stroke: Replacement Rear Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FSR RC W-Muffler - 40: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FSR Ring RN - 50: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FT 12 Twin RC 4C - 45: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FT Twin 120 II - 45: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FT Twin RC 4C - 12: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FT Twin RC 4C - 120: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FT12011 Twin RC - 4 Stroke: Replacement Rear Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® FT160 Twin RC - 4 Stroke: Replacement Rear Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® Old FF 4 CYL - 61: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® Old FT Twin 4C - 240: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® Old FT Twin 4C - 25: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® RX - 21: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® RX140: Replacement Rear Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® RX-2 Cycle - 15: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® RX-EFI - 140: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer OS Engines® RX-FI - 21: Bearing - High Speed Economy Ceramic-Hybrid Bearing - Polyamide Retainer Replacement Part: 6904-CSN-T9H-ECO (Each) Open economy ceramic-hybrid bearing with a high speed polyamide retainer Single Row Ball Bearings - 20x37x9 mm Unflanged - Chrome Steel SAE 52100 - High Speed Polyamide Cage - Ceramic Si3N4 Balls Bearing |
$94.14
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Temporarily Out Of Stock
-> Backorder now for delivery around Jun 26, 2026
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- Replaces - OS Engines® 1.08 FR RC W-Muffler: BB 20-37-9 OS Engines® AX 120 - 46: BB 20-37-9 OS Engines® F320 4 Cylinder RC - 4 Stroke: BB 20-37-9 OS Engines® F4 4-C - 32: BB 20-37-9 OS Engines® F4 4CYL - 32: BB 20-37-9 OS Engines® FF240 4 Cylinder RC - 4 Stroke: BB 20-37-9 OS Engines® FSR RC W-Muffler - 40: BB 20-37-9 OS Engines® FSR RC W-Muffler - 50: BB 20-37-9 OS Engines® FSR Ring RN - 108: BB 20-37-9 OS Engines® FSR Ring RN - 50: BB 20-37-9 OS Engines® FT 12 Twin RC 4C - 40: BB 20-37-9 OS Engines® FT Twin RC 4C - 12: BB 20-37-9 OS Engines® FT Twin RC 4C - 45: BB 20-37-9 OS Engines® FT12011 Twin RC - 4 Stroke: BB 20-37-9 OS Engines® FT160 Twin RC - 4 Stroke: BB 20-37-9 OS Engines® RX - 21: BB 20-37-9 OS Engines® RX-2 Cycle - 15: BB 20-37-9 OS Engines® RX-EFI - 140: BB 20-37-9 OS Engines® RX-EFI - 21: BB 20-37-9 OS Engines® RX-FI - 140: BB 20-37-9 OS Engines® RX-FI - 21: BB 20-37-9 OS Engines® 1.08 FR RC W-Muffler: Replacement Rear Bearing - Standard Bearing OS Engines® AX 120 - 46: Bearing - Standard Bearing OS Engines® F320 4 Cylinder RC - 4 Stroke: Replacement Rear Bearing - Standard Bearing Shielded Option OS Engines® F4 4-C - 32: Bearing - Standard Bearing OS Engines® F4 4CYL - 32: Bearing - Standard Bearing Shielded Option OS Engines® FF240 4 Cylinder RC - 4 Stroke: Replacement Rear Bearing - Standard Bearing Shielded Option OS Engines® FSR RC W-Muffler - 40: Bearing - Standard Bearing Shielded Option OS Engines® FSR RC W-Muffler - 50: Bearing - Standard Bearing Shielded Option OS Engines® FSR Ring RN - 108: Bearing - Standard Bearing Shielded Option OS Engines® FSR Ring RN - 50: Bearing - Standard Bearing Shielded Option OS Engines® FT 12 Twin RC 4C - 40: Bearing - Standard Bearing OS Engines® FT Twin RC 4C - 12: Bearing - Standard Bearing Shielded Option OS Engines® FT Twin RC 4C - 45: Bearing - Standard Bearing OS Engines® FT12011 Twin RC - 4 Stroke: Replacement Rear Bearing - Standard Bearing Shielded Option OS Engines® FT160 Twin RC - 4 Stroke: Replacement Rear Bearing - Standard Bearing Shielded Option OS Engines® RX - 21: Bearing - Standard Bearing Shielded Option OS Engines® RX-2 Cycle - 15: Bearing - Standard Bearing Shielded Option OS Engines® RX-EFI - 140: Bearing - Standard Bearing Shielded Option OS Engines® RX-EFI - 21: Bearing - Standard Bearing Shielded Option OS Engines® RX-FI - 140: Bearing - Standard Bearing Shielded Option OS Engines® RX-FI - 21: Bearing - Standard Bearing Shielded Option Replacement Part: 6904-ZZ (Each) Deleted Item. Available while stocks last. Single Row Ball Bearings - 20x37x9 mm Unflanged - Chrome Steel SAE 52100 Bearing |
$3.64
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31 Available Now
-> Only the available quantity may be ordered online. No backorders.
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- Replaces - OS Engines® FX - 240: BB 20-42-12 OS Engines® FX - 240: Replacement Rear Bearing - High Speed Economy Bearing - Polyamide Retainer Replacement Part: 6004-Z-T9H-ACO-ECO (Each) Single shielded economy bearing with a high speed polyamide retainer and light anti-rust lubricant Single Row Ball Bearings - 20x42x12 mm Unflanged - Chrome Steel SAE 52100 - High Speed Polyamide Cage Bearing |
$52.14
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Temporarily Out Of Stock
-> Backorder now for delivery around Jun 26, 2026
View Entire Category: | ||||
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- Replaces - OS Engines® 140 RX - 2 Stroke: BB 20-42-12 OS Engines® 160 RX - 2 Stroke: BB 20-42-12 OS Engines® 140 RX - 2 Stroke: Replacement Rear Bearing - Standard Bearing OS Engines® 160 RX - 2 Stroke: Replacement Rear Bearing - Standard Bearing Replacement Part: 6004 (Each) Open standard bearing Single Row Ball Bearings - 20x42x12 mm Unflanged - Chrome Steel SAE 52100 Bearing |
$7.50
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Temporarily Out Of Stock
-> Backorder now for delivery around May 26, 2026
View Entire Category: | ||||
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- Replaces - OS Engines® FX - 240: BB 20-42-12 OS Engines® FX - 240: Replacement Rear Bearing - Economy Bearing Shielded Option Replacement Part: S6004-ZZ-ECO (Each) Single Row Ball Bearings - 20x42x12 mm Unflanged - Stainless Steel AISI 440C Bearing |
$12.59
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3 Available Now
-> Orders for more than 3 can be expected around Jun 21, 2026
View Entire Category: | ||||
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- Replaces - OS Engines® FX - 240: BB 20-42-12 OS Engines® FX - 240: Replacement Rear Bearing - Standard Bearing Shielded Option Replacement Part: 6004-ZZ (Each) Double shielded standard bearing Single Row Ball Bearings - 20x42x12 mm Unflanged - Chrome Steel SAE 52100 Bearing |
$11.95
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2 Available Now
-> Orders for more than 2 can be expected around May 26, 2026
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- Replaces - OS Engines® BGX-1 Ring RN - 46: BB 22-44-12 OS Engines® BGX1-Ring - 46: BB 22-44-12 OS Engines® BGX-3500 - 46: BB 22-44-12 OS Engines® FP - 32: BB 22-44-12 OS Engines® BGX-1 Ring RN - 46: Bearing - Economy Bearing OS Engines® BGX1-Ring - 46: Bearing - Economy Bearing OS Engines® BGX-3500 - 46: Bearing - Economy Bearing OS Engines® FP - 32: Bearing - Economy Bearing Replacement Part: MR4422-ZZ-ECO (Each) Double shielded economy bearing Single Row Ball Bearings - 22x44x12 mm Unflanged - Chrome Steel SAE 52100 Bearing |
$53.50
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Temporarily Out Of Stock
-> Backorder now for delivery around Jun 26, 2026
View Entire Category: | ||||
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- Replaces - OS Engines® 3500: BB 22-44-12 OS Engines® 3500: Replacement Rear Bearing - Economy Bearing Replacement Part: MR4422-ECO (Each) Open economy bearing Single Row Ball Bearings - 22x44x12 mm Unflanged - Chrome Steel SAE 52100 Bearing |
$49.32
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Temporarily Out Of Stock
-> Backorder now for delivery around Jun 26, 2026
View Entire Category: | ||||