If you’re rebuilding a Hyundai–Kia Theta II, meet Piston 23410-2G000 KIA G4KD 2.0L 86MM STD — the quiet workhorse many independent shops keep on the shelf. I’ve seen it in commuter sedans and ride-hailing fleets; in fact, the feedback I hear most is simple: “drops in clean, seals fast.”
Engines are lasting longer, but shops are picky about ring seal and cold-start noise. The trend is toward hypereutectic Al–Si pistons with low-friction skirt coatings and tight pin-bore tolerances. The Piston 23410-2G000 KIA G4KD 2.0L 86MM STD aims squarely there—reliable, price-sane, and compliant with mainstream automotive quality systems.
| Engine | Hyundai/Kia G4KD 2.0L (Theta II) |
| Bore | 86.0 mm (STD) |
| Part numbers | 23410-2G000, 234102G000, 234102G010, 234102G020 |
| Wrist pin | ≈21 mm, full-float |
| Alloy | Hypereutectic Al–Si (≈12% Si), heat-treated |
| Skirt | Graphite/MoS2 low-friction coating |
| Ring pack | Top ≈1.2 mm, 2nd ≈1.5 mm, Oil ≈2.5 mm (real-world kits may vary) |
| Compression height | ≈30.1 mm |
| Weight | ≈320 g per piston |
Origin: 289 Heping East Road, Chang’an District, Shijiazhuang City, Hebei Province, China.
| Vendor | Alloy/Coating | Tolerance (bore) | Warranty | Notes |
|---|---|---|---|---|
| Genuine OEM | OE hypereutectic / Moly | ≈±0.005 mm | 12 mo. | Highest price; consistent. |
| Oujia Engine (this unit) | Hypereutectic / Graphite-MoS2 | ≈±0.01 mm | 6–12 mo. (region) | Value balance; broad availability. |
| Generic budget | Cast Al / basic graphite | ≈±0.02 mm | 3–6 mo. | Watch ring-land height and pin fit. |
A taxi fleet in Xi’an swapped in a set of Piston 23410-2G000 KIA G4KD 2.0L 86MM STD during a mid-life refresh (honed cylinders, OE rings). After 60,000 km, oil use measured ≈150 ml/1,000 km—well within expectations—and drivers reported quieter cold starts than the worn OE set. Not scientific, but telling.
Customer feedback, informally: “Pins fit snug out of the box,” “no odd scuffing on first inspection,” and, surprisingly, “less piston slap than we feared.” Always check ring end gaps against the manual, though.
References
