Description
Overview:
The Guide Assy, Ex. Valve (Honda 12201-Z0D-305) is a genuine Honda exhaust valve guide for small 4‐stroke petrol engines such as the GX100 and EU20i. It sits in the cylinder head and keeps the exhaust valve stem running true, helping to maintain correct valve timing, seal, and heat transfer. Manufactured to Honda's OEM tolerances from a wear‐resistant metal alloy, it is designed for high-temperature exhaust service and long life. A correct guide is vital for reducing valve wobble, maintaining compression, and preventing premature valve and seat wear. This part is a direct replacement for worn or ovalised guides and is intended for press-fit installation during head overhaul or repair, restoring smooth, reliable engine operation.
Key Features:
- Genuine Honda OEM part for assured fit and compatibility on specified models
- Precision-bored guide for correct valve stem clearance and alignment
- Wear-resistant metallurgy suitable for the hot exhaust side of the head
- Helps restore compression, power, and exhaust sealing performance
- Reduces valve wobble and noise caused by guide wear
- Press-fit design to OEM depth for consistent valve geometry
- Supports proper heat transfer from valve stem to cylinder head
- Stable lubrication film retention for reduced stem scuffing
- Ideal for head rebuilds, preventative maintenance, or targeted repair
- Supplied as a single exhaust valve guide matching Honda 12201-Z0D-305
Typical Applications:
Used during cylinder head rebuilds or repairs on Honda GX100-based equipment, including compact generators, water pumps, plate compactors, and turf machinery. Suitable when valve stem-to-guide clearance is out of spec, when blue smoke, tapping, or poor compression suggests guide wear, or after high-hour operation to return the engine to stable performance.
Also known as:
Exhaust valve guide, valve stem guide, valve guide bush, exhaust guide bush, valve sleeve, exhaust guide insert, ex. valve bush, cylinder head valve guide.
Fits Models:
EU20i, GX100, GX100U
Product Specifications
| L&S Part No. | 12201 Z0D 305 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Honda |
| OEM No. | 12201Z0D305 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Honda |
| Key Features | - Genuine Honda OEM part for GX100 and EU20i engines - Precision-bored for correct valve stem clearance - Wear-resistant alloy for high-temperature exhaust service - Press-fit installation for consistent valve geometry - Reduces valve wobble and noise from guide wear |
| Fits Models | GX100 (GCANM) | GX100U (GCAGK) | EU20i |
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