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I got a 1990 600R from a friend of mine two months ago. The whole time he had it and the last two months I have had it the temp guage does hardly goes up unless it is rode hard. Except when it is warm out it runs hot when not moving. Until today.

Just before home it would not idle, had to keep the throttle up to keep running. If it died it was hard to start. One block before home it sounded and ran like crap, like it was out of fuel or had a dead cylinder. In the driveway, while idling, the temp shot up to halfway. I shut it down fast. A few minutes after checking everything I started it up again and it started idling fine and sounded normal. I rode it about a half a mile and the temp went back down and was back to normal. I let it idle in the driveway a couple minutes and the temp went back up to about 1/4, which is where I think it should have been all these years.

I have no idea what happened. My old Honda did something simular when I rebuild the carbs. Except that it would die all together. Turned out one of the float needles was sticking shut.

Any ideas anyone???? The only thing I can think of is the thermostat was stuck half way open, thus why it would not warm up fast or overheat when rode hard. Thanks.
 

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I'd check the thermostat. Sounds like it stuck closed and it overheated. Actually, I'd just replace it anyway. I'm guessing that the temp sensor is in the radiator, that's why it spiked when the stat opened up.

-gary
'02 6R
 

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Thanks Gary. I was thinking about replacing it anyways. I had never thought about the sensor being affected like that. Makes sense though.
 
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