CABER Piston Ring Ø35x1.5 mm side notch

The CABER S.350.15.N piston ring is a universal part. The ring sits in the piston groove. It seals the piston against the cylinder and carries part of the piston's heat away. This one is sold singly, in the bore and thickness given: it's the part you change to bring compression back to an engine whose piston is still in good shape.

Specifications

• Brand: CABER
• Manufacturer part number: S.350.15.N

When to replace it?

• Loss of compression and power, harder starting.
• End gap above the figure in the manual, measured in the cylinder.
• Ring stuck in its groove, broken or showing blow-by marks.

At every top-end check, and straight away as soon as compression drops. As a Cross-Mania guideline, on a 2-stroke motocross bike the rings are checked every 10 to 15 hours of racing and every 20 to 30 hours of leisure riding.

Fitting tips

1. Compare with the old ring: diameter, thickness, profile and notch position (side or internal) must be the same.
2. Push the ring squarely into the cylinder with the piston and measure its end gap with a feeler gauge.
3. Clean the piston groove without widening it, then open the ring just enough to fit it, by hand or with ring pliers.
4. Line the ring gap up exactly with the pin in the groove: a misplaced ring breaks on the first turn.
5. Lightly oil the cylinder and reassemble with a new top end gasket kit.

Spare parts and items to plan

• Top-end gasket kit : see the selection
• Spark plug : see the selection

Frequently asked questions

How do I find the right ring?
Measure the cylinder bore and the thickness of the original ring, then check the notch position: diameter, thickness and type are given in the title and specifications.

Do I need to order two?
Yes if your piston has two rings: this one is sold singly, so order one per ring groove.

Compatibility

Universal part: check the dimensions given before ordering.