Yamaha YZ125 Owner's Manual

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ENGINE3-11do not remove the radiator cap when the en-gine is hot. Scalding hot fluid and steam maybe blown out, which could cause serious in-jury. When the engine has cooled, open theradiator cap as follows:Place a thick rag or a towel over the radiatorcap and slowly turn the radiator cap counter-clockwise toward the detent to allow any re-sidual pressure to escape. When the hissingsound has stopped, press down on the radi-ator cap and turn it counterclockwise to re-move.1. Stand the vehicle upright on a level surface.2. Remove:• Radiator cap “1”3. Check:• Coolant levelMaximum level “a” or below  Add coolantup to the maximum level.NOTICEECA24260• Adding water instead of coolant lowers theantifreeze content. If, therefore, water isused instead of coolant, check, and if nec-essary, adjust the antifreeze concentration.• Use only distilled water. However, if dis-tilled water is not available, soft water maybe used.4. Start the engine, warm this up for severalminutes, and then stop it.5. Check:• Coolant levelTIPBefore checking the coolant level, wait a fewminutes until the coolant has settled.EAM30211CHECKING THE COOLING SYSTEM1. Remove:• Seat• Side cover (left/right)• Air scoop (left/right)2. Check:• Radiator• Radiator hoseCrack/damage  Replace.3. Install:• Air scoop (left/right)• Seat• Side cover (left/right)EAM30212CHANGING THE COOLANTWARNINGEWA13030A hot radiator is under pressure. Therefore,do not remove the radiator cap when the en-gine is hot. Scalding hot fluid and steam maybe blown out, which could cause serious in-jury. When the engine has cooled, open theradiator cap as follows:Place a thick rag or a towel over the radiatorcap and slowly turn the radiator cap counter-clockwise toward the detent to allow any re-sidual pressure to escape. When the hissingsound has stopped, press down on the radi-ator cap and turn it counterclockwise to re-move.1. Place a container under the engine.2. Remove:• Coolant drain bolt “1”3. Remove:• Radiator cap1. Radiator