Question about 1991 Honda CBR 250 RR

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I have a 91 Honda CBR250rr. It is getting really hot and steaming on long trips. I think my thermostat might be broken or the fan is blowing the wrong way. I have enough oil I have enough coolant and everything works great unless i drive it for more than about 30 mins. How do I check slash fix either the thermostat or the fan?

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The fan is pluged in to wiring harness should not be a problem,the thermostat could be a problem when it kicks your fan in if at all if your bike is on the move continulasly it should not need the fan running unless the outside temprature is extreme,if you are doing stop start city riding then this can cause a lot of bikes to overheat,first test is to get the bike up to operating temp and without riding it and as the temprature is rising listen for when or if the fan starts if it doesnt then it could be your thermostat,if that is right it would pay to take it to the dealer and get them to check it out for you as too many times boiling is decreasing engine life by a lot . cheers hopes this helps

Posted on Oct 27, 2013

Testimonial: "Thanks man. This is great info. I am trying to learn as much as possible. I found out that my fan was indeed on backwards do to my bike having many owners before and that I live in Vietnam. It gets crazy hot here in the summer. also my radiator had a pin hole leak that was dripping on the headers. thats where the steam came from."


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look in the resevoir, or wait till cool, and remove the radiator cap, just like a car.

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SOURCE: 1983 Honda Shadow 500- Gets hot and won't crank back.

Your honda shadow 500 over heats,because the oil cant room around the engine of the bike.the problem is the worn out destroyed oil seal .Check and replace the oil seal of your bike.

Posted on Jul 28, 2009

SOURCE: Honda Super 4 CB400 coolant system hiccups

There seems to be an airlock in the system, as for the thermostate you can remove it check it out, fill in some water in a pan,insert the thermostate in it and heat up the will see the thermostate ,if functioning start to open around 82 degrees centigrade or so.
Hope this helps!

Posted on Oct 27, 2009

Testimonial: "Thanks yeah it was an airlock removed the fuel tank and then pressure cap and pumped the tubes and air bubbled out once I started to fill more water"

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