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Message: [QUOTE="OZ_dirtrider, post: 154117, member: 23973"] Riding along behind my brothers KDX250F2, when l notice splashes of milky residue coming off his bike. My bro knew it was a problem as the bike started to surge and loss power thru pinging. When we pulled over, the white residue was the gearbox oil mixed with water and seeping from the clutch cover and gearbox oil breather hose. On further inspection, the top of the radiator cap was cool and upon opening there was no water. I told him that it was the water pump and maybe a head gasket if the motor cooked enough. We topped it up and the coolant was still green as it spewed out. Back to the trailer, l unbolted the water cover to find that the bolt had come off the impeller and the whole motor was hot, as in steaming. After tightening the water pump impeller, it felt a touch loose in it's sideways movement. I emptied out the gearbox oil (filled a bottle and a half) and tighten up the clutch case bolts, filled the radiator and took it for a ride. The power was instantly back during the ride and the bike didn't surge when you are coasting off the throttle but when l returned (5min blast) l opened the top of the radiator and again no water (could see the core), filled it and the colour of the coolant was still green. Q1. If the motor was still hot, could the water have evaporated from the time l fixed the water pump till the end of my test ride (all up 15-20 mins)? Q2. Should l replace the water pump seal as a precaution? And how hard of a job is it? Need all the help fellas. J :( [/QUOTE]

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