Automotive parts and accessories designed to enable accurate valve clearance adjustments on Yamaha YZ250F engines. Home mechanics and track riders gain confidence from the wide selection of shim sizes in the AHL Valve Shim Kit. Does the selection and material quality stand up to repeated adjustments and track use?
⚡ At a Glance
- • Thickness Range: 1.20mm to 3.50mm in 0.05mm increments
- • Best for: DIY mechanics and Yamaha YZ250F owners needing precise valve shimming
- • Not ideal for: Owners of motorcycles other than Yamaha YZ250F 2001–2012 or workshops needing specialised hydraulic tappet parts
Contains 47 shims covering 1.20mm–3.50mm in 0.05mm steps for Yamaha YZ250F 2001–2012. Carburising steel construction with a wear-resistant, low-noise finish aims to improve stability and durability.
Accurate valve clearances – with 47 precision shims in 0.05mm steps
A full set includes one shim at each increment from 1.20mm to 3.50mm, allowing very small changes to overall valve clearance without machining. Fine-step sizing reduces the need for repeated measurement and trial fitting.
Greater control over clearance adjustments reduces tuning time and helps achieve repeatable valve settings for better engine performance.
Reduced wear and noise – thanks to carburising steel and wear-resistant finish
Carburising steel increases surface hardness after heat treatment, improving resistance to abrasion under cam/valve contact. A wear-resistant coating lowers friction where parts meet, which in turn reduces valvetrain noise.
Longer-lasting shim faces and quieter operation mean fewer replacements and a calmer-running top end during both road and track use.
Quicker workshop turnaround – with straightforward sizing and organisation
One shim of each size keeps selection simple and eliminates the need to source individual thicknesses from multiple suppliers. A complete, organised kit shortens the process of finding the nearest fitting shim.
Faster shimming saves workshop time between maintenance sessions and makes roadside or trackside adjustments more practical.
✨ The 4 Key Reasons for AHL Valve Shim Kit
- Precision Fit – Accurate seating reduces variation in valve clearances and improves repeatability
- One-of-each Size – Immediate access to incremental sizes speeds up shim selection during maintenance
- Easy to Adjust – Straightforward sizing helps complete shimming faster with fewer test cycles
- Track-Friendly Organisation – Compact kit keeps spares organised for quick between-run adjustments
📋 Technical Details at a Glance
- Category: Automotive Parts and Accessories
- Brand: AHL
- Compatible Models: Yamaha YZ250F 2001–2012
- Material: Carburising steel
- Finish: Wear-resistant, low-noise material
❓ Frequently Asked Questions
Q: Are these shims compatible with my Yamaha YZ250F?
A: Yes, the kit is specified for Yamaha YZ250F models from 2001 to 2012.
Q: How many shims are included and what sizes do they cover?
A: The set contains 47 shims, one of each size from 1.20mm to 3.50mm in 0.05mm increments.
Q: What material are the shims made from and why does that matter?
A: Shims are made from carburising steel with a wear-resistant, low-noise finish to improve durability and reduce valvetrain noise.
🏆 Our Verdict
Suitable for DIY mechanics and Yamaha YZ250F owners who need reliable, repeatable valve-clearance adjustments. The combination of a full 47-piece range and carburising steel construction makes the kit a practical choice for regular maintenance and track preparation. While initial cost varies, the organised, durable set offers clear long-term value through reduced rework and fewer replacements.
