Namura Size B Piston Kit for KTM 50 SX Pro Jr Sr Mini Junior STD Bore 39.50mm
Namura Size B Piston Kit for KTM 50 SX Pro Jr Sr Mini Junior STD Bore 39.50mm
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Size B Piston Kit for KTM
This size B piston kit is for KTM 50 SX Pro, Jr, Sr, Mini, and Junior models with a standard bore of 39.50mm.
Overview
The Namura size B piston kit for KTM 50 SX includes a piston, rings, and wrist pin for rebuilding the top end. It is designed for KTM 50 SX variants with a 39.50mm standard bore. This piston kit restores compression and performance on KTM 50 SX engines.
Built For Performance
- Includes piston, rings, and wrist pin
- Precision machined to 39.50mm standard bore
- High-quality alloy for durability
- Size B ensures proper clearance for stock cylinders
- Designed for high-rpm minibike engines
Fits These Machines
- for KTM 50 SX Pro
- for KTM 50 SX Jr
- for KTM 50 SX Sr
- for KTM 50 SX Mini
- for KTM 50 SX Junior
On-The-Job Use
- Top end rebuild for racing minibikes
- Replacing worn or seized piston
- Restoring engine power on KTM 50 SX
- Competition maintenance for junior classes
Specs At A Glance
| Product | Piston Kit |
| Brand | for KTM |
| Bore | 39.50mm STD |
| Size | B |
Good To Know
Q: What is the difference between Size A and Size B? A: Size B is typically .01mm larger than standard; use if cylinder has slight wear. Measure your cylinder to confirm.
Q: Is the wrist pin bearing included? A: The kit includes wrist pin but not the bearing; order separately if needed.
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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