Overheating - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 06-25-2012, 08:54 AM Thread Starter
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Overheating

I have a 92 750. Fan works, temp gauge reads that the engine is not overheating, but after riding about 15 minutes the engine gets so hot that the my gas tank starts building pressure (hissing), and cant hardly touch the engine. I've bled out the cooling system, and put in a new t-stat. What am I missing???? Please help...
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post #2 of 12 (permalink) Old 06-25-2012, 09:44 AM
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I thought the hissing was normal. If it's sunny out all I have to do is rock the bike a little to make it hiss.

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post #3 of 12 (permalink) Old 06-25-2012, 09:53 AM
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Yeah if the temperature gauge reads ok and if your fan comes on I doubt you are over heating. Is the bike running rough or starting to die when it gets to the point of hissing?
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post #4 of 12 (permalink) Old 06-25-2012, 10:03 AM
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Hissing is from the tank vent system. You can clean it to reduce the noise.

Where is the temperature gauge at? Does it go past 50%?

1986 Kawasaki Vulcan 750
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post #5 of 12 (permalink) Old 06-25-2012, 03:53 PM
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You shouldn't be able to touch the side of the engine- it will be the same as the coolant temp, approx 185 degrees F!
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post #6 of 12 (permalink) Old 07-05-2012, 07:14 PM
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im having the same problem, it turned out to b the radiator fan, it sounded like it was going till i realized the fan blades were not spinning.
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post #7 of 12 (permalink) Old 07-09-2012, 05:29 AM
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I had finally had enough of mine. It got so hot the other day it scared me. So, I pulled the radiator and soaked it in straight radiator cleaner for 1/2 hour, dumped that and then soaked in a 50/50 solution of distilled water and white vinegar. After that I flushed it with the garden hose first bottom to top then top to bottom several times with a little water pressure. I got a lot of gunk out. Took it for an hour long ride last night in 80 degree weather and the gage only went to 1/2 way between the middle and red. Which is better than the red like it was doing. And the fan kicks on sooner which I guess I must have cleaned the sensor at the same time. Gotta wait for a hot day to see now if its better, but it looks like it is
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post #8 of 12 (permalink) Old 07-09-2012, 01:11 PM
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L2fish, just ride down here to South Alabama, we got plenty of hot days right now.

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post #9 of 12 (permalink) Old 07-09-2012, 01:16 PM
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Another thing to do is blow air through the air fins. There is a lot of dirt caught up in there. It is best to blow the air back-wards.

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post #10 of 12 (permalink) Old 07-09-2012, 08:46 PM
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Yup, cleaned the fins as well. CW-4. I had a friend move down to Georgia. He wouldnt ride in the summer months. Said it too damn hot! He rode up here until ice though, rain and shine.
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