⚠️ Safety Warning: When changing oil, ensure the engine is warm but not scalding to allow for better flow. After completing an EGR delete, double-check that all vacuum ports are sealed; a leak here can cause the engine to run lean, potentially leading to overheating or piston damage.
Yamaha YZF-R125: Essential Guides
1. Oil & Filter Change (Step-by-Step)
This is the most critical maintenance task for the YZF-R125 engine's longevity.
Drain the Oil: Locate the 17mm drain bolt at the bottom of the engine. Place a tray underneath and remove the bolt. Inspect the O-ring for any tears or flattening.
Remove the Filter: The oil filter is on the right-hand side of the engine behind a small circular cover (3 bolts). Pull out the old paper filter.
Install New Filter: Insert the new filter (ensure it is facing the right way—usually the open hole faces inward). Replace the cover and tighten the bolts evenly.
Refill: Reinstall the drain bolt. Pour in approximately 0.95L to 1.0L of 10W-40 4-stroke motorcycle oil.
Level Check: Start the engine for 2 minutes, let it settle for 2 minutes, then check the level using the dipstick (held upright, not screwed in).
2. EGR Delete (Simple Performance Mod)
The EGR (Exhaust Gas Recirculation) system cycles hot exhaust gases back into the intake for emissions. Deleting it helps the engine run cooler and cleaner.
Locate the System: Look for the piping running from the exhaust port area back toward the airbox/intake.
Remove Piping: Disconnect the pipe and the associated valve.
Blanking: You will need a blanking plate for the engine/exhaust port and a bung/cap for the airbox hole. It is essential that these are airtight.
Result: This prevents carbon buildup in the intake and can slightly sharpen throttle response by ensuring only fresh air enters the combustion chamber.
Parts & Tools
Service Kits:
R125 Oil, Filter & Spark Plug Kits (eBay UK) EGR Plates:
Yamaha YZF-R125 EGR Blanking Plates (eBay UK)
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