Rear Sprocket 40T 520 Yamaha YZ 125 / YZ 250 / YZ-F 250 / YZ-F 450 / WR-F 99-25

Replaces Part Numbers & Specifications

OEM PART NUMBERS:
• Yamaha: 17D-25447-50-00 / 17D254475000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 17D-25448-50-00 / 17D254485000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 17D-25449-50-00 / 17D254495000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 17D-25450-50-00 / 17D254505000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 17D-25451-50-00 / 17D254515000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 17D-25452-50-00 / 17D254525000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 1C3-25447-00-00 / 1C3254470000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 1C3-25448-00-00 / 1C3254480000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 1C3-25450-00-00 / 1C3254500000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 1C3-25451-00-00 / 1C3254510000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 1C3-25452-00-00 / 1C3254520000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5ET-25447-00-00 / 5ET254470000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5ET-25448-00-00 / 5ET254480000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5ET-25450-00-00 / 5ET254500000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5ET-25451-00-00 / 5ET254510000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5ET-25452-00-00 / 5ET254520000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5NY-25448-00-00 / 5NY254480000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5NY-25450-00-00 / 5NY254500000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5NY-25451-00-00 / 5NY254510000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5NY-25452-00-00 / 5NY254520000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)
• Yamaha: 5TJ-25450-80-00 / 5TJ254508000 (OEM 48-53T Rear Sprocket - Same Bolt Pattern Fitment)

SPROCKET SPECIFICATIONS:
• Type: Rear (Drive) Sprocket
• Position: Rear (Drive)
• Number of Teeth: 40
• Chain Size: 520 Pitch
• Material: Steel
• Bolt Pattern: 4-Bolt
• Condition: New

YAMAHA APPLICATIONS:
• YZ 125 124cc 2-Stroke YPVS 35HP MX (1999-2025)
• YZ 250 249cc 2-Stroke YPVS 49HP MX (1999-2025)
• YZ-F 250 249cc DOHC FI 39HP MX (2001-2025)
• YZ-F 400 399cc DOHC 5-Valve MX (1999)
• YZ-F 426 426cc DOHC 5-Valve MX (2000-2002)
• YZ-F 450 449cc DOHC FI 57HP MX (2003-2025)

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.

YAMAHA YZ 125 / YZ 250 / YZ-F 250 / YZ-F 450 / WR-F 250 / WR-F 450 / TT-R 230 Motorcycle - ALL MODELS:

YZ 125:
• Yamaha YZ 125 124cc 1-Cyl 2-Stroke Reed-Valve Liquid-Cooled 35HP YPVS Motocross Motorcycle (1999-2025)

YZ 250:
• Yamaha YZ 250 249cc 1-Cyl 2-Stroke Reed-Valve Liquid-Cooled 49HP YPVS Motocross Motorcycle (1999-2025)

YZ-F 250:
• Yamaha YZ-F 250 249cc 1-Cyl DOHC 4-Valve 4-Stroke Liquid-Cooled 39HP Fuel-Injected Motocross Motorcycle (2001-2025)

YZ-F 400:
• Yamaha YZ-F 400 399cc 1-Cyl DOHC 5-Valve 4-Stroke Liquid-Cooled Motocross Motorcycle (1999)

YZ-F 426:
• Yamaha YZ-F 426 426cc 1-Cyl DOHC 5-Valve 4-Stroke Liquid-Cooled Motocross Motorcycle (2000-2002)

YZ-F 450:
• Yamaha YZ-F 450 449cc 1-Cyl DOHC 4-Titanium-Valve 4-Stroke Liquid-Cooled 57HP Fuel-Injected Motocross Motorcycle (2003-2025)

YZ-FX 250:
• Yamaha YZ-FX 250 249cc 1-Cyl DOHC 4-Valve 4-Stroke Liquid-Cooled 39HP Fuel-Injected Cross-Country Motorcycle (2015-2025)

YZ-FX 450:
• Yamaha YZ-FX 450 449cc 1-Cyl DOHC 4-Valve 4-Stroke Liquid-Cooled 57HP Fuel-Injected Cross-Country Motorcycle (2016-2025)

YZ-X 125:
• Yamaha YZ-X 125 124cc 1-Cyl 2-Stroke Reed-Valve Liquid-Cooled YPVS Cross-Country Motorcycle (2020-2025)

YZ-X 250:
• Yamaha YZ-X 250 249cc 1-Cyl 2-Stroke Reed-Valve Liquid-Cooled YPVS Cross-Country Motorcycle (2016-2025)

WR 250 (1999-2000):
• Yamaha WR 250 249cc 1-Cyl 2-Stroke Liquid-Cooled Enduro Motorcycle (1999-2000)

WR-F 250:
• Yamaha WR-F 250 249cc 1-Cyl DOHC 4-Valve 4-Stroke Liquid-Cooled Fuel-Injected Enduro Motorcycle (2001-2025)

WR-F 400:
• Yamaha WR-F 400 399cc 1-Cyl DOHC 5-Valve 4-Stroke Liquid-Cooled Enduro Motorcycle (1999-2001)

WR-F 426:
• Yamaha WR-F 426 426cc 1-Cyl DOHC 5-Valve 4-Stroke Liquid-Cooled Enduro Motorcycle (2001-2002)

WR-F 450:
• Yamaha WR-F 450 449cc 1-Cyl DOHC 4-Valve 4-Stroke Liquid-Cooled Fuel-Injected Enduro Motorcycle (2003-2025)

TT-R 230:
• Yamaha TT-R 230 223cc 1-Cyl SOHC 2-Valve 4-Stroke Air-Cooled 15HP Trail Motorcycle (2005-2024)

YZ 50TH ANNIVERSARY 125:
• Yamaha YZ 125 50th Anniversary 124cc 1-Cyl 2-Stroke Liquid-Cooled 35HP YPVS Limited Edition Motocross Motorcycle (2024)

YZ 50TH ANNIVERSARY 250:
• Yamaha YZ 250 50th Anniversary 249cc 1-Cyl 2-Stroke Liquid-Cooled YPVS Limited Edition Motocross Motorcycle (2024)

YZ MONSTER ENERGY 125:
• Yamaha YZ 125 Monster Energy 124cc 1-Cyl 2-Stroke Liquid-Cooled 35HP YPVS Motocross Motorcycle (2022-2025)

YZ MONSTER ENERGY 250:
• Yamaha YZ 250 Monster Energy 249cc 1-Cyl 2-Stroke Liquid-Cooled YPVS Motocross Motorcycle (2022-2025)

YZ-F MONSTER ENERGY 250:
• Yamaha YZ-F 250 Monster Energy 249cc 1-Cyl DOHC 4-Valve 4-Stroke Liquid-Cooled 39HP FI Motocross Motorcycle (2021-2025)

YZ-F MONSTER ENERGY 450:
• Yamaha YZ-F 450 Monster Energy 449cc 1-Cyl DOHC 4-Valve 4-Stroke Liquid-Cooled 57HP FI Motocross Motorcycle (2021-2025)

ENGINE SPECIFICATIONS:
• Various: 124cc 2-Stroke Liquid-Cooled 35HP / 249cc 2-Stroke Liquid-Cooled 49HP / 249cc DOHC FI 39HP / 449cc DOHC FI 57HP / 223cc SOHC 15HP / 399-426cc DOHC 5-Valve
• Various: Liquid-Cooled (MX/Enduro) / Air-Cooled (TT-R 230) / Various: Keihin PWK38S Carburetor w/ YPVS (2-Stroke) / Mikuni Fuel Injection (4-Stroke)
• 5-Speed (YZ 250, WR-F 450) / 6-Speed (YZ 125, YZ-F 250, YZ-F 450, WR-F 250, TT-R 230) / Chain Drive (520 Pitch)
• Stock Gearing: Various: 13T/49T (YZ 125, YZ-F 450) / 13T/50T (YZ-F 250) / 14T/50T (YZ 250) / 13T/52T (WR-F 250 early) / 13T/50T (WR-F 450) / 14T/49T (TT-R 230)
• Kick Start (2-Stroke) / Electric Start (4-Stroke, TT-R 230) / Various: Premix (2-Stroke) / Dry Sump (YZ-F) / Wet Sump (WR-F, TT-R)

SHIPPING INFORMATION

SHIPPING TIME: Marine Parts Distributors is proud to offer free ground shipping to all customers having items shipped to addresses in the 48 contiguous states. Orders placed and paid by 4:00 PM EST will ship the same business day (excluding weekends and holidays which will ship next business day). Tracking information will be sent via e-mail by our shipping department. Delivery times can vary by location and shipping method. Typically, free shipping to the eastern US is estimated to be delivered in 1-2 business days, where deliveries to the western US (or most remote locations) may take up to 4-6 business days.

Items purchased with FREE SHIPPING & FLAT SHIPPING RATES only apply to US 48 CONTIGUOUS STATES and does NOT include APO/FPO/MPO (these areas are subject to a shipping surcharge). International Shipping, US Non-Continental shipping - which includes Alaska, Hawaii, Puerto Rico, US Territories and APO/FPO/MPO - all have 3-10 business day delivery times. Shipments will be delivered by UPS, FEDEX, or USPS and the carrier will be selected at our discretion. We also offer Expedited Shipping WORLDWIDE, including Saturday delivery (Saturday Delivery is an extra $15.00 and is not always available).

Please add your items to a cart to determine your shipping costs and rates. Please note that international orders may be subject to customs and duty fees; all international shipping costs are the responsibility of the customer.

Should you have any questions or concerns regarding shipping your item, please contact the customer service department 8AM-6PM EST Monday-Friday. You may also email any questions or concerns you have regarding shipping your item.

CANCELING ORDERS: In the event you need to cancel or change your order you may do so within 24 hours, provided your order has not been shipped, by contacting us through eBay's messaging center. Please make sure the Ship-To address you use during checkout is correct. All orders that are returned to sender or undeliverable are subject to a 20% return charge.

Marine Parts Distributors products, when properly installed, are warranted against defects in materials and workmanship to the original purchaser for a period of one (1) year from the date of purchase. Warranty does not cover failure due to accident, abuse, neglect or as the result of normal wear and tear. Improper installation, careless handling, tampering or disassembly in any way will void original factory warranty. Failures due to rust, submersions, deliberate abuse, broken gears, housings or components shall not be considered for warranty, nor products used in applications for which they were not intended.

The sole responsibility of Marine Parts Distributors - if any - shall be the replacement of defective products as stated above. This warranty being expressly in lieu of all other obligations or liabilities and Marine Parts Distributors neither assumes nor authorizes any other person or firm to assume for it any other liability in connection with the sale of its products or merchandise.

It is the responsibility of the customer to verify the correct application information prior to purchasing any product from Marine Parts Distributors. All purchases made in error, bought by mistake, no longer wanted, or returned to sender due to an incorrect address are subject to a 20% return charge and require a return authorization number. In these cases, the return shipping costs will also be deducted from the refund using our discounted shipping rates. Buyers are responsible for the shipping of any international orders.

BUYER IS RESPONSIBLE FOR ANY AND ALL SHIPPING CHARGES.

It is the responsibility of the customer to verify the correct application information prior to purchasing any product from MARINE PARTS DISTRIBUTORS. All purchases made in error are subject to a 20% return charge and require a return authorization number.

If an order must be canceled or changed, please contact the service department as soon as possible. Shipping times for orders are staggered throughout the day, depending on which carrier is shipping your order. Customers are notified via email when their item is on the loading dock ready to ship. Marine Parts Distributors reserves the right to apply a 20% return charge to orders canceled after the item has been packaged and taken to the shipping terminal. Please ensure that you have entered the correct shipping address at check out. It is the responsibility of customers to ensure they have provided the correct shipping address. If you need to specify a carrier to deliver your order to your address, please contact the customer service department before making a purchase.

BUYER IS RESPONSIBLE FOR ANY AND ALL SHIPPING CHARGES.