ATHENA Piston Ring Set Ø77 mm for SUZUKI RMZ 250, KAWASAKI KXF 250 and YAMAHA WRF 250, YZF 250 2009-2019

On YAMAHA WRF 250, YZF 250, KAWASAKI KXF 250 and SUZUKI RMZ 250 from 2009 to 2019, the ATHENA S41316169 set of piston rings (Ø 77 mm) fits in place of the original part. Thin and heavily loaded, the rings seal between the piston and the cylinder. They are often the first parts to wear: new rings bring compression back to an engine whose piston and cylinder are still within spec.

Specifications

• Brand: ATHENA
• Manufacturer part number: S41316169
• EAN code: 8057018265077
• For ATHENA piston
• Diameter: 77 mm
• Engine: 4-stroke

When to replace it?

• Loss of compression and power, harder starting.
• Ring end gap, measured in the cylinder, larger than the figure in the manual.
• Ring stuck in its groove or showing traces of blow-by.
• On a four-stroke: oil consumption and blue smoke.

At every top end inspection, and at the latest when the piston is replaced. On a piston that is still within spec, new rings at mid-life bring the compression back. As a Cross-Mania guideline, the complete piston is replaced every 30 to 60 hours of engine running depending on whether you race or ride for fun.

Fitting tips

1. Clean the piston grooves (a broken old ring makes a good scraper) without widening them.
2. Place each ring in the cylinder, pushed in square with the piston, and measure its end gap with a feeler gauge.
3. Open the rings just enough to slip them over the piston, by hand or with ring pliers: opened too far, they distort or break.
4. Mark facing up, gaps staggered by about 120°, without overlapping the ends of the oil control ring.
5. Lightly oil the cylinder and the rings before reassembly, with a new top end gasket kit.

Why ATHENA?

Founded in 1973 near Vicenza, Athena is an Italian engine gasket specialist that has made its gaskets on its own production lines since day one, as well as a renowned manufacturer of pistons and cylinder kits. The brand supplies original equipment to manufacturers such as KTM, Ducati, Fantic, Piaggio and Triumph, and is a partner of the MXGP motocross world championship.

Spare parts and items to plan

• Piston : PROX · WOSSNER
• Top-end gasket kit : see the selection
• Piston pin : WOSSNER · ATHENA
• Piston pin clips : WISECO · VERTEX
• Spark plug : see the selection

Frequently asked questions

Which diameter should I choose?
The nominal diameter of your piston, given in the title. The rings go on a piston of the same bore size.

Does the engine need breaking in?
Yes: one hour of gentle break-in, without sustained full throttle, so the rings bed in to the cylinder.

Compatibility

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

Fits:
KAWASAKI KXF 250 2016
KAWASAKI KXF 250 2015
KAWASAKI KXF 250 2014
KAWASAKI KXF 250 2013
KAWASAKI KXF 250 2012
KAWASAKI KXF 250 2011
KAWASAKI KXF 250 2010
KAWASAKI KXF 250 2009
SUZUKI RMZ 250 2019
SUZUKI RMZ 250 2018
SUZUKI RMZ 250 2017
SUZUKI RMZ 250 2016
SUZUKI RMZ 250 2015
SUZUKI RMZ 250 2014
SUZUKI RMZ 250 2013
SUZUKI RMZ 250 2012
SUZUKI RMZ 250 2011
SUZUKI RMZ 250 2010
YAMAHA WRF 250 2017
YAMAHA WRF 250 2016
YAMAHA WRF 250 2015
YAMAHA YZF 250 2016
YAMAHA YZF 250 2015