Wiseco High-Performance Forged Piston Kit with Gaskets - KTM 520/525 SX/EXC (2000-2007) - 95.00mm Bore - HIGH COMPRESSION
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Wiseco High-Performance Forged Piston Kit with Gaskets - KTM 520 / 525 SX / EXC - High Compression
Premium Wiseco forged piston kit with complete top-end gasket set for the legendary KTM 520 and 525 big bore thumpers. This is the HIGH COMPRESSION version with 12.5:1 compression ratio for maximum performance!
⚡ High Compression: 12.5:1
This is a high compression piston (12.5:1) designed for riders who want maximum power. Higher compression increases power output but requires premium fuel. Compare to our standard compression kit (11.0:1) if you prefer stock compression.
Kit Includes
- Wiseco Forged Piston (#4732M09500) - Premium 2618 aluminum alloy, high compression
- Ring Set (#9500ZS) - Wiseco performance rings
- Wrist Pin (#S641)
- Wrist Pin Retainer Set (#CW20)
- Top End Gasket Kit (#W5885) - Complete gasket set for top-end rebuild
Key Features
- Premium forged 2618 aluminum alloy construction
- Complete top-end gasket kit included
- High compression 12.5:1 ratio for maximum power
- Standard bore - direct OEM replacement dimensions
- Pistons, rings, wrist pins, and circlips for one complete engine
Important Notes
- High compression - requires premium fuel
- Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC)
- Wiseco pistons can be fitted only with Wiseco rings
- Cylinder sleeves must be purchased separately if needed
Piston Specifications
- Bore Size: 95.00 mm (Standard)
- Piston Diameter: 94.92 mm
- Stroke Length: 72.00 mm
- Compression Ratio: 12.5:1 (HIGH COMPRESSION)
- Material: 2618 Aluminum Alloy
- Skirt Coating: Non-Coated
- Style: Forged Series
Engine Specifications
- Displacement: 510cc
- Engine Type: 4-Stroke
- Weight: 1.84 lbs
Fitment
KTM 520:
- 520 SX: 2000-2002
- 520 EXC: 2000-2002
- 520 EXC Racing 4-Stroke: 2000-2002
KTM 525:
- 525 SX: 2003-2006
- 525 EXC: 2003-2007
Standard vs High Compression
This is the HIGH COMPRESSION (12.5:1) kit. If you prefer stock compression for reliability and pump gas compatibility, check out our standard compression kit (11.0:1, SKU 0903-1161).
Why Wiseco?
Wiseco is the gold standard in forged pistons. Their 2618 aluminum alloy pistons are designed for high-performance applications where strength and durability are critical. The high compression piston extracts maximum power from the legendary KTM RFS engine!
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
