Piston Kit OS 1.00 - Suzuki LT 230 1985 2002 And LT 250 1985
Piston Kit OS 1.00 - Suzuki LT 230 1985 2002 And LT 250 1985 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping info
- Standard delivery (2-4 working days) - £4.99 on eligible UK mainland orders under £50.
- Express delivery - £6.99 on eligible UK mainland orders placed before 2pm.
- Large equipment including international orders are subject to different delivery rates and timescales.
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Piston Kit OS 1.00 - Suzuki LT 230 1985 2002 And LT 250 1985 is backordered and will ship as soon as it is back in stock.
OS 1.00 oversize piston kit designed to restore compression and reliable power for the LT 230 (1985 - 2002) and LT 250 (1985 - 2014) engines. This aftermarket replacement uses an OS 1.00 piston to compensate bore wear, bringing back stock-like performance and throttle response across a broad operating range. The kit is engineered to fit the engine’s bore tolerances and deliver a dependable seal for trail, farm, or utility use.
An aftermarket replacement built to endure demanding conditions, this kit tackles common wear issues such as bore wear and ring-land distortion that reduce compression and power. It’s a reliable choice for the trail or field, offering a cost-effective way to restore peak compression and efficient combustion without paying OEM prices, while maintaining proper fits and clearances.
What's Included
This kit includes the essential components to rebuild the top end:
- Piston OS 1.00 oversize
- Rings Set OS 1.00 (piston ring set)
- Piston Pin
- Piston Pin Circlips
Note: Related gaskets, head bolts, and other top-end seals are not included unless specified.
OEM & Aftermarket Cross-Reference Information
| Part Number | Brand / Type | Cross-Reference Notes |
|---|---|---|
| 12103-18830-100 | OEM Reference | OS 1.00 piston kit for LT230 LT250; fits 1985 - 2002 LT230 and 1985 - 2014 LT250 variants; cross-referenced to OS 1.00 dimensions. |
| 12111-18A04-100 | OEM Reference | OS 1.00 piston kit cross-reference for the same LT230/LT250 range; alternate OEM code commonly referenced in parts catalogs for OS 1.00 applications. |
Fitment
| Manufacturer | Models / Series | Years / Details |
|---|---|---|
| Suzuki | LT 230 | 1985 - 2002 |
| Suzuki | LT 250 | 1985 - 2014 |
Specifications
| Attribute | Details |
|---|---|
| OEM Reference Part Numbers | 12103-18830-100; 12111-18A04-100 |
| Type | Piston Kit OS 1.00 oversize |
| Manufacturer | Aftermarket Replacement |
| Application | Suzuki LT 230 (1985 - 2002), LT 250 (1985 - 2014) |
| Piston Size / Oversize | OS 1.00 oversize (+1.00 mm over stock bore; standard bore typically ~66.00 mm for LT230 variants, OS adds ~1.00 mm) |
| Ring Set | Piston Ring Set OS 1.00 (e.g., 12140-22A10-100) |
| Piston Pin | 12151-22A02-000 |
| Piston Pin Circlips | 09381-16002-000 |
Installation Notes
- Inspect the cylinder bore for scoring or excessive wear; if bore is out of spec, consider a proper bore measurement and machine work before installing OS oversize pistons.
- Use a piston ring compressor and lubricate the piston, rings, and pin with light engine oil or assembly lube before installation.
- Align the piston rings correctly and stagger end gaps if required; verify recommended gap per the kit’s ring set documentation.
- Install the piston pin and secure with new circlips; ensure circlips are fully seated in their grooves.
- During reassembly, apply fresh gaskets where applicable and torque head bolts to the service manual specifications.
- Break in the engine gradually after installation: avoid high RPMs and heavy loads for the initial hours to seating rings properly.
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