2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 86Get this manual

2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 86

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COOLANT REPLACEMENT 8.Remove: Radiator cap 1
A hot radiator is under pressureTherefore, do not remove the radiator cap when the engine is hotScalding hot fluid and steam may be blown out, which