KTM 50 Senior Adventure 2002-2007 39.5mm Cylinder Piston Head Kit
Brand new aftermarket complete top-end rebuild kit for the KTM 50 Senior Adventure 2002-2007 air-cooled 50cc two-stroke engine.
The kit uses the KTM 39.5 mm air-cooled cylinder pattern and includes the finned cylinder barrel, finned cylinder head, piston, piston ring, wrist pin, needle bearing, circlips and matching top-end gaskets.
Direct Fitment
- KTM 50 Senior Adventure - 2002-2007
Direct-fit application for the KTM 50 Senior Adventure air-cooled engine family.
Kit Contents
- 1 x air-cooled cylinder barrel
- 1 x finned cylinder head
- 1 x 39.5 mm piston
- 1 x piston ring
- 1 x 12 mm wrist / gudgeon pin
- 1 x small-end needle bearing
- 2 x piston-pin circlips
- 1 x cylinder-head gasket
- 1 x cylinder-base gasket
Technical Specifications
- Engine type: 50cc single-cylinder 2-stroke
- Cooling: Air cooled
- Standard bore: 39.5 mm
- Piston-pin diameter: 12 mm
- Comparable wrist-pin size: approximately 12 x 31 mm
- Comparable cylinder body height: approximately 59 mm
- Construction: Finned cylinder and cylinder head
- Listed Shopify shipping weight: 3.0 kg
- SKU: 00819-ENG
KTM OE / OEM Reference Numbers
- 45130505000 A - Cylinder 39.5 mm A
- 45130505000 B - Cylinder 39.5 mm B
- 45130505000 C - Cylinder 39.5 mm C
- 45130538000 - Cylinder & piston kit supersession
- 45130506000 - Cylinder head 50 AC 2002
- 45130506100 - Cylinder head 50 GS 2002
- 45130537000 - Cylinder-head gasket 50 AC
- 46030035020 - 0.2 mm cylinder-base gasket
- 46030035050 - 0.5 mm cylinder-base gasket
- 45130599000 - Complete gasket set 50 AC
Important Engine Identification
This kit is for the air-cooled KTM 50 Adventure engine family. It is not intended for the liquid-cooled KTM 50 SX / SX Mini / Pro Junior / Pro Senior engines, which use a different cylinder system.
It is also not intended for 2001-and-earlier KTM 50 models fitted with the earlier black Morini Franco engine.
Fitment Check
Before ordering, compare the original cylinder, cylinder-head cooling fins, 39.5 mm bore, 12 mm piston pin, exhaust outlet, inlet/reed opening, mounting-stud layout and gasket profiles with the product photographs and the engine currently fitted.
When This Kit May Be Required
- Low compression
- Piston seizure or scoring
- Damaged cylinder bore
- Broken or worn piston ring
- Top-end noise or loss of performance
- Engine restoration or complete top-end rebuild
Installation
Correct piston orientation, ring location, small-end bearing lubrication, gasket selection, cylinder-base clearance and cylinder-head tightening are essential. Check the crankshaft, connecting rod and small-end bearing condition before rebuilding the top end. Professional installation is recommended.
Search Terms
KTM 50 Adventure cylinder kit, KTM 50 Mini Adventure piston kit, KTM 50 Junior Adventure cylinder, KTM 50 Senior Adventure cylinder, 45130505000, 45130538000, 39.5mm KTM piston, KTM 50 air cooled top end kit, KTM 50 engine rebuild kit.
Condition: Brand new aftermarket replacement. OE numbers are supplied for identification and compatibility comparison only; this product is not represented as a genuine KTM component.