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SKU:
NLT2S00569
Ships for free in 2–4 business days.
Cylinder & Piston Top-End Kit for 2005–2021 Yamaha YZ125 125cc 2-Stroke – 1C3-11311-10-00 / 1C3-11311-21-00
$316.89
In Stock
$316.89
Sale price
$316.89
Regular price
This replacement top-end cylinder and piston gasket kit is listed for select Yamaha YZ125 125cc two-stroke motorcycles using cylinder references #1C3-11311-10-00 or #1C3-11311-21-00. Confirm the cylinder generation and piston sizing.
Estimated delivery between
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- 2005 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2006 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2007 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2008 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2009 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2010 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2011 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2012 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2013 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2014 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2015 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2016 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2017 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2018 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2019 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2020 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2021 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- 2020 Yamaha YZ125X — 125cc two-stroke off-road engine, cylinder OE match
- 2021 Yamaha YZ125X — 125cc two-stroke off-road engine, cylinder OE match
- 2022 Yamaha YZ125X — 125cc two-stroke off-road engine, cylinder OE match
Important Fitment Note: Yamaha lists OE 1C3-11311-21-00 for YZ125 2005–2021 and YZ125X 2020–2022; the earlier export’s 2005–2022 YZ125 claim needs year-specific verification. Confirm piston diameter, plating, power-valve pieces and gasket kit contents.
Product Overview
The cylinder guides the piston while the piston and rings seal compression in the two-stroke top end.
Scoring, worn rings or low compression can require a top-end rebuild to restore sealing and starting performance.
Yamaha lists OE 1C3-11311-21-00 for YZ125 2005–2021 and YZ125X 2020–2022; the earlier export’s 2005–2022 YZ125 claim needs year-specific verification. Confirm piston diameter, plating, power-valve pieces and gasket kit contents.
Key Features & Performance
- Part & Application: Cylinder & Piston Top-End Gasket Kit. 2005 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match
- Part Identification: 1C3-11311-10-00, 1C3-11311-21-00
- Package Contents: Cylinder, piston and associated top-end gaskets as described; confirm piston rings, wrist pin, clips and power-valve parts before purchase.
- Fitment Priority: Confirm original part, configuration, and mounting features before installation.
Specifications
- Product: Cylinder & Piston Top-End Gasket Kit
- Brand: Northline Parts aftermarket replacement or accessory (unless otherwise stated by the original listing)
- Northline Parts SKU: NLT2S00569
Replaces / Cross-References
Reference identifiers associated with this listing:
- 1C3-11311-10-00
- 1C3-11311-21-00
Numbers marked as product references identify this part or its application. Alternate spelling or punctuation does not establish a separate verified interchange. Match the original assembly and required configuration before purchasing.
What Is Included
Cylinder, piston and associated top-end gaskets as described; confirm piston rings, wrist pin, clips and power-valve parts before purchase.
Installation & Fitment Notes
Yamaha lists OE 1C3-11311-21-00 for YZ125 2005–2021 and YZ125X 2020–2022; the earlier export’s 2005–2022 YZ125 claim needs year-specific verification. Confirm piston diameter, plating, power-valve pieces and gasket kit contents.
Follow the service procedure for the specific equipment or vehicle. Compare the replacement with the original part before installation; professional installation is recommended for steering, braking, suspension, electrical and drivetrain components.
Frequently Asked Questions
Is this an OEM part?
No. This listing is for an aftermarket replacement or accessory unless the product is specifically described as genuine. Manufacturer names and OE numbers are provided for fitment identification.
How do I know whether it will fit?
Yamaha lists OE 1C3-11311-21-00 for YZ125 2005–2021 and YZ125X 2020–2022; the earlier export’s 2005–2022 YZ125 claim needs year-specific verification. Confirm piston diameter, plating, power-valve pieces and gasket kit contents.
When should this part be replaced?
Scoring, worn rings or low compression can require a top-end rebuild to restore sealing and starting performance.
What is included?
Cylinder, piston and associated top-end gaskets as described; confirm piston rings, wrist pin, clips and power-valve parts before purchase.
Part Summary
Part: Cylinder & Piston Top-End Gasket Kit for 2005/2006/2007/2008/2009/2010/2011/2012/2013/2014/2015/2016/2017/2018/2019/2020/2021 Yamaha YZ125 125cc 2-Stroke — 1C3-11311-10-00 / 1C3-11311-21-00
Applications: 2005 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2006 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2007 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2008 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2009 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2010 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2011 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2012 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2013 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2014 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2015 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2016 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2017 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2018 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2019 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2020 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2021 Yamaha YZ125 — 125cc two-stroke motocross engine, cylinder OE match; 2020 Yamaha YZ125X — 125cc two-stroke off-road engine, cylinder OE match and additional individually listed applications above
Reference Numbers: 1C3-11311-10-00, 1C3-11311-21-00
Purpose: The cylinder guides the piston while the piston and rings seal compression in the two-stroke top end.
Northline Parts SKU: NLT2S00569
Keywords: Cylinder & Piston Top-End Gasket Kit for 2005/2006/2007/2008/2009/2010/2011/2012/2013/2014/2015/2016/2017/2018/2019/2020/2021 Yamaha YZ125 125cc 2-Stroke — 1C3-11311-10-00 / 1C3-11311-21-00, Cylinder & Piston Top-End Gasket Kit, NLT2S00569, Northline Parts, 1C3-11311-10-00, 1C3-11311-21-00, Yamaha YZ125.