86 vn750 overheating - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 18 (permalink) Old 05-15-2014, 07:27 AM Thread Starter
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86 vn750 overheating

Im new to motorcycles and i just started riding my 750, got almost all the way the work this morning and it started running hot. Then coolant started coming out of the overflow hose. Could thid mean anything specific or could it be a lot of things? Thanks!
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post #2 of 18 (permalink) Old 05-15-2014, 08:06 AM
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When you say it's running hot, how high is the needle? Over flow may just mean it's over filled and you haven't seen it self regulate because it hasn't been a hot enough day yet.

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post #3 of 18 (permalink) Old 05-15-2014, 08:36 AM Thread Starter
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Needle was just before goin into the red and it was after about 35-40 mins of riding through routine traffic lights and light highway riding
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post #4 of 18 (permalink) Old 05-15-2014, 08:39 AM
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When coolant shoots out of the overflow hose, it can be as simple as your system being under-filled. It can mean the return hose from the reservoir is cracked (pushes out coolant to the reservoir, sucks in air to the radiator, eventually becomes under-filled), or a possible radiator cap failure.

1986 Kawasaki Vulcan 750
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post #5 of 18 (permalink) Old 05-15-2014, 09:27 AM Thread Starter
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Ok i will check the hose, could it have anythig to do with the thermostat sticking? My first thought this morning was to take it out just to get me home later if that was the problem..bad idea?
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post #6 of 18 (permalink) Old 05-15-2014, 09:45 AM
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Could be a sticking thermostat. Was the fan running? They can definitely overheat without the fan.

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post #7 of 18 (permalink) Old 05-15-2014, 09:51 AM
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Could be a sticking thermostat. Was the fan running? They can definitely overheat without the fan.
Good point and it should be running for a bit after you turn off the bike.

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post #8 of 18 (permalink) Old 05-15-2014, 11:41 AM Thread Starter
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Ok so i jumped the fan to make sure it works..it does but i did not hear it running when i got off of it..could it be the relay and if so where is the relay located?
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post #9 of 18 (permalink) Old 05-15-2014, 12:03 PM
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Bet you a sack of nickels its the temp switch.

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post #10 of 18 (permalink) Old 05-15-2014, 12:04 PM
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The relay is in the junction box and not easily replaced. A couple of members here do service them.

It could be a bad fan switch, on the front of the engine. When fully warm, the switch terminal should show continuity to ground.

My fan quit due to a loose spade in the connector at the junction box, tightened it up and it's been fine.

If you warm the engine, the fan should kick on when the temp gauge is at the middle.

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