loosing water ???

probably got a leaking head gasket.
Water leaks into barrel and is evaporated as steam.
Happened to my Rmx 250
 
I had a small crack in a radiator fin, would only leak under significant pressure.

Also had a shot water pump, that would cause overheating and therfore water loss

Check to see if your has the plastic impeller...if so my advise is get rid of it
 
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