I noticed recently that my bike Honda Cbr 125RS is overheating and on inspection the coolant level in the radiator was low. I added some collant and it was fine for three weeks and now the machine is overheating again. I am certain that coolant is low again. What could be the possible cause for the coolant to disappear?
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either internally or externally.
Have you any leaks on the ground?
If you check your oil / coolant levels, have you got "mayonnaise" (oil & coolant mixing somewhere that shouldn't)?
What age / mileage is the bike?
Do you mean the coolant level was low in the header/expansion tank?
It could be something simple like a faulty radiator/pressure cap (on the radiator).
Also as AdieR says.
No not in expansion tank. For some reason there is no change in coolant level in my expansion tank even if the radiator is empty. In fact that's what happened last time. so I had to add coolant directly to the radiator(after keeping the engine cool overnight)
I havent noticed any leaks. I purchased the bike last year second hand. The bike is 2005 model but the odometer read only 6000. I do suspect if that was the actual reading coz the bike does seem to used a great deal
try and answer questions,as AdieR second one.
If the engine oil is clean and you haven`t seen any coloured smoke coming out of the exhaust then i would try a new radiator pressure cap (correct rating).
Also check the overflow pipe & expansion tank for flow.
If this fails after filling the cooling system correctly (no air pockets) then a pressure test will reveal any leakage.