PROX Piston Kit for KTM EXC 380, SX 380 1998-2002

PROX offers this piston kit for KTM EXC 380, SX 380 1998-2002. The piston slides in the cylinder and takes the force of the air-fuel combustion, passing it to the connecting rod and crankshaft.

Why replace the piston?

The benefits:

• Restore compression, power and easy starting.
• A piston of the right size keeps the intended clearance in the cylinder: less noise and less oil consumption.
• A new piston with rings, pin and clips: nothing to reuse from the old one.

Why choose PROX?

ProX has its pistons made in Japan and the USA, with Japanese rings (Riken, TP or NPR) and tolerances at least equal to OEM; most of its four-stroke pistons are forged.

When should you replace the piston on your KTM EXC 380?

Harder starting, loss of power, blue smoke, oil consumption or a knock when cold: these are the signs of a tired top end.

No manufacturer hour figure for this model. Cross-Mania guideline: compression check every 20 h in hard use and every 40 h for leisure.

Specifications and fitting tips

• Manufacturer part numbers: 01.6398.A (A), 01.6398.B (B), 01.6398.C (C)

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 77.94 mm, B = 77.95 mm, C = 77.96 mm.

Spare parts and items to plan

• Piston rings : see the selection
• Piston pin : WOSSNER
• Piston pin clips : VERTEX
• Top-end gasket kit : ATHENA S4102700060 · ATHENA M751802450094
• Small end needle bearing : PROX · WOSSNER
• Spark plug : see the selection
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
KTM EXC 380 2002
KTM EXC 380 2001
KTM EXC 380 2000
KTM EXC 380 1999
KTM EXC 380 1998
KTM SX 380 2002
KTM SX 380 2001
KTM SX 380 2000
KTM SX 380 1999
KTM SX 380 1998