Piston orientation?
HDF Community Team
Joined: Jan 2020
Posts: 1,434
Likes: 800
From: Colorado
If stock pistons, then arrow on both pistons will be pointing to front of bike.
If aftermarket pistons, then need photo on the top and bottom side of the piston, and need you to add in direction of arrow on top of piston to the bottom of photo as well.
And to add, really easy to tell which way the piston goes in, since you have the valve relief cuts on the top, but more so the lugs on the piston that tell you which side will be sprocket side to start with.
https://www.hdforums.com/forum/evo/1...ntation-2.html
If aftermarket pistons, then need photo on the top and bottom side of the piston, and need you to add in direction of arrow on top of piston to the bottom of photo as well.
And to add, really easy to tell which way the piston goes in, since you have the valve relief cuts on the top, but more so the lugs on the piston that tell you which side will be sprocket side to start with.
https://www.hdforums.com/forum/evo/1...ntation-2.html
Last edited by Dano523; Apr 8, 2025 at 03:01 PM.
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