Maintenance & Technical > KX500 Original

anyone care to explain this piston?

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vagassasson:

Why does the piston on the right have a big hole in the side that goes almost all the way to the middle. It has the same hole on both sides. I am new to working on k5 motors so if this is a really stupid question just delete this thread.

vagassasson:
It also has a set of groves machined in the ring area of the piston

stujordan:
Holes I guess are for cooling....

Grooves r for the rings? ;)

Motorrad:
Holes for weight

Groves?

vagassasson:
If you zoom in really close to the rings on the right there are 5 small groves cut in between the ring groves and 5 more above the ring groves +1 more below the ring groves

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