Short Description
Genuine KTM OEM Size II / B piston kit for KTM 50 SX models. Complete replacement kit including piston, piston ring, wrist pin and circlips, designed to restore compression and factory engine performance.
Product Description
KTM 50 SX OEM Piston Kit – Size II / B
The KTM OEM Piston Kit 45230007100 II is a genuine factory replacement piston assembly designed for KTM 50 SX 2-stroke engines.
This version is the Size II / B piston, intended for cylinders requiring the second factory piston size classification.
Replacing a worn piston and piston ring helps restore proper engine compression, throttle response and overall engine performance.
Manufactured to KTM factory specifications, the piston provides the correct dimensions, clearances and durability required for high-performance mini motocross use.
Features
Genuine KTM OEM product
Size II / B specification piston
Complete piston replacement kit
Designed for KTM 50cc 2-stroke engines
Factory-spec dimensions and tolerances
Helps restore engine compression
Reliable performance at high RPM
Suitable for motocross and racing use
Direct OEM replacement
Kit Includes
1x Piston – Size II / B
1x Piston Ring
1x Wrist / Piston Pin
2x Piston Pin Circlips
Note: Piston pin needle bearing is not included.
Compatibility / Fitment
KTM 50 SX
KTM 50 SX 2019
KTM 50 SX 2020
KTM 50 SX 2021
KTM 50 SX 2022
KTM 50 SX 2023
KTM 50 SX 2024
KTM 50 SX 2025
KTM 50 SX 2026
KTM 50 SX Mini
KTM 50 SX Mini 2019
KTM 50 SX Mini 2020
KTM 50 SX Mini 2021
KTM 50 SX Mini 2022
KTM 50 SX Mini 2023
KTM 50 SX Factory Edition
KTM 50 SX Factory Edition 2021
KTM 50 SX Factory Edition 2022
KTM 50 SX Factory Edition 2023
KTM 50 SX Factory Edition 2024
KTM 50 SX Factory Edition 2025
KTM 50 SX Factory Edition 2026
Product Details
Brand: KTM
Product Type: Complete Piston Kit
Piston Size: Size II / B
OEM Part Number: 45230007100 II
Engine Type: 2-Stroke
Engine Capacity: 50cc
Application: Mini Motocross / Racing
Condition: New / Genuine OEM
Important – Size I vs Size II
KTM offers this piston in two factory size classifications:
Size I / A: 45230007100 I
Size II / B: 45230007100 II
This product is specifically the:
Size II / B – 45230007100 II
Do not select the piston size based only on the motorcycle model year.
The correct piston size should be determined according to the cylinder condition, existing piston specification and factory piston-to-cylinder clearance.
If you are unsure which piston size your motorcycle requires, the cylinder and existing piston should be measured before ordering.
Recommended Inspection During Replacement
When replacing the piston, we recommend checking:
Cylinder bore condition
Piston-to-cylinder clearance
Connecting rod small-end bearing
Piston pin needle bearing
Cylinder base gasket
Cylinder head O-rings
Connecting rod play
Correct piston clearance is essential for engine performance and service life.
Legal Disclaimer
Motoes is not an authorized KTM dealer. The products offered for sale are original; however, Motoes does not operate as an official distributor or authorized service center of KTM.