Namura Size C Piston Kit for KTM 50 SX Pro Jr Sr Mini Junior STD Bore 39.50mm
Namura Size C Piston Kit for KTM 50 SX Pro Jr Sr Mini Junior STD Bore 39.50mm
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Piston Kit for KTM 50 SX
This Namura Size C piston kit fits KTM 50 SX Pro Jr Sr Mini Junior models with a standard bore of 39.50mm, replacing worn pistons for restored performance.
Overview
This Namura Size C piston kit is designed for KTM 50 SX mini dirt bikes including Pro, Jr, Sr, and Junior variants. It features a 39.50mm standard bore and includes piston rings and wrist pin. This kit restores compression and power in two‑stroke engines.
Built For Performance
- Precision‑cast aluminum alloy construction
- Includes piston rings and wrist pin
- Machined to exact 39.50mm bore size
- Designed for high‑revving mini engines
Fits These Machines
- for KTM 50 SX Pro
- for KTM 50 SX Jr
- for KTM 50 SX Sr
- for KTM 50 SX Mini Junior
On-The-Job Use
- Youth motocross racing
- Off‑road practice and training
- Engine rebuild projects
Specs At A Glance
| Part Number(s) | Not applicable |
| Bore Size | 39.50mm |
| Piston Grade | C (Size C) |
Good To Know
Q: Does this piston kit include a circlip? A: It includes rings, wrist pin, and circlips; you may need to order a gasket set separately.
Q: What oil ratio is recommended for break‑in? A: Follow the KTM owner’s manual; typically 40:1 to 32:1 with high‑quality two‑stroke oil.
Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.
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