Beginner — under 30 min
Description
With a compression height of 1.640 inches and a dome height of 0.340 inches, these pistons are suitable for use with cylinder heads that have a volume of approximately 118cc, yielding a compression ratio around 9.8:1. The pin diameter measures 0.990 inches. The ring groove thickness is 5/64 inch x 5/64 inch x 3/16 inch.
Fitment
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Specifications
| Brand | SEALED POWER |
| Part Number | S03T H581CP 40 |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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