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gilera DNA 125 overheating?

My gilera DNA 125 has suddenly started overheating. i've checked the fluid levels as this bike is liquid cooled and the levels are fine. I've checked the oil and the levels are fine. I noticed that even after an hour the coolant ws still very hot. Can anybody give me help?
Steve, July 2008
my gilera 125 dna is overheating smoke sometime will appare from the fan..it has leeked once..
the helment box was wet and very hot.....
isit the liquid i put in the cooolant

simon, August 2011
Check coolant hoses.if bottom one is hot and top one is cold/cool then renew thermostat if that dosent cure and radiator is even temperature then suspect coolant pump or blocked rad.if both hot then and under execive pressure suspect head gasket.

caine, July 2008
link Click here to see other fixes for Gilera DNA.