Quote:
Originally Posted by surlistyc
........But let's say for now that, that isn't the case, and the radiator is fine, what else might it be?.....
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Welcome to the site, Surlistyc !!
Learn more about the system:
http://faq.ninja250.org/wiki/Cooling_system
I would remove the thermostat and test the engine without it.
I would fill the system up with distilled water and Waterwetter.
http://www.autozone.com/autozone/acc...ntifier=486218
The radiator can be easily clogged by debris or sediments (old coolant), since the path of the tubes is very narrow.
Have the coolant been fully replaced and the system flushed in the last two years?
After that time, the coolant looses properties and starts internal corrosion, which generates debris.
If the radiator has salt deposits from hard water (tap water containing salts) use, then you will need to buy another (they are expensive).
Check your oil for coolant contamination.
If found, the water pump may be leaking into the crankcase.
Best !