2006 Yamaha Motorsports VK Professional Owners Manual - Page 67
2006 Yamaha Motorsports VK Professional Manual
Page 67 highlights
ESU04910 Cooling system Bleeding the cooling system WARNING @ G G Do not remove the radiator cap when the engine is hot. Scalding hot fluid and steam may be blown out under pressure, which could cause serious injury. When the engine has cooled, place a thick rag or towel over the radiator cap, and slowly rotate the cap counterclockwise to the detent. This procedure allows any residual pressure to escape. When the hissing sound has stopped, press down on the cap while turning counterclockwise and remove it. The cooling system must be bled of air if the coolant reservoir becomes empty, if air can be seen in the cooling system, or if there is a cooling system leak. Consult a Yamaha dealer. @ 1 Radiator cap CAUTION: @ Operating the engine with an improperly bled cooling system can cause overheating and severe engine damage. @ 8-12