From the Loftsmith community

2003 YZ125 piston replica

A desk-sized stand-in for the two-stroke piston from a 2003 YZ125, handy for showing how the parts sit together. There's a ring groove under the domed crown, a round wrist pin hole in the side, and an arrow on top. Resize the diameter or height to match another bore.

1 part · 27 g · 54 × 54 × 55 mm

Cylindrical piston with domed crown, thin ring groove, round pin hole and a cutout at the skirt
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No adjustable sizes

Ask for the sizes you want to tweak, e.g. “make the width adjustable”.

Change it in the Studio

Parts

  • piston · PLA · Crown down on the bed (printRotate 180° about X), skirt pointing up

    The wrist pin and ring are see-through previews only and don't print.

Print settings

Layer height
0.12 mm for the detail
Walls
3
Infill
15%
Supports
Tree supports inside the skirt and under the pin bosses only (~6 g)
Notes
Print crown down.

Good to know

  • Dimensions are estimated, not taken from Yamaha drawings. The pin height (35 mm) and the pocket and arch sizes come from your photo, which has no scale. Measure your piston and type the values into the sliders.
  • The report flags 'thin ledges'. These are the deliberate 0.35 mm steps where the skirt faces are recessed.
  • The turned grooves are 0.2 mm deep, so they will show as a faint texture rather than crisp lines.
I printed this Remix

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