Overheating and sits at 2 rpms while standing still. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 12 (permalink) Old 03-04-2014, 04:36 PM Thread Starter
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Overheating and sits at 2 rpms while standing still.

New rider, got a 96 vulcan vn 750, guy who had it before me had it sitting for a while. 40000 miles on it, new battery, oil changed, new coolant, spark plugs, ect..

Well to begin the first day I had the bike it was riding fine the whole day up until I parked the bike in neutral and left it running for 5mins to make a phone call. Came back to the coolant tank steaming/smoking and spewing out coolant from the cap. Let sit for awhile, put more coolant in it, then rode 90 miles with no problems. I think it was the 3rd day of riding it I rode to school without any problems which is probably like 15 milesaway but on the way back noticed my bike was heated more than usual seeing as the heat gauge was at half way. Stopped to check the coolant tank and it was full, thought maybe the gauge was broken but by the time I got to my house coolant started spewing out of the top again and my gauge arrow was on the red. Took it to a mechanic to see what the problem was he said he thinks its something to do with the front lifter and to get a used motor for parts ect. Was just trying to see if anyone has or had similar problems with a different and not as expensive solution.

After I left the machanics shop I drove my bikeback to my place but now noticed that while standing still at a light my rpms were at 2 and without giving it any gas.
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post #2 of 12 (permalink) Old 03-04-2014, 05:26 PM
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I kinda doubt anythings wrong with your "lifters".... Part of your problem might be you just put too much coolant in the bike. Coolant shouldn't shoot out of the cap?...there's an overflow hose, make sure it's not clogged or blocked.

Normally the bike should read in the halfway mark, but if its moving into the red (right of center) there might be a problem. Like the fan not going on. Or an air bubble in the system. (Generally not a good idea to leave the bike runnng and walk away from it)

As for the RPMs reading "2" do you mean 2000? Don't think there's a mark for 2 RPMs on the gauge.

Hopefully someone more familar with cooling issues will post some suggestions...

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post #3 of 12 (permalink) Old 03-04-2014, 05:49 PM
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im thinking air bubble, or fan not comming on.

Also, i agree with KM, dont walk away from your bike with it running, your asking for it to run away from you with someone else on it, or something can fail or act up, and if your not there to shut it off promptly, more damage will be done.
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post #4 of 12 (permalink) Old 03-04-2014, 06:10 PM
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Did you bleed the air from the cooling system? It's the nipple behind the radiator cap.

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post #5 of 12 (permalink) Old 03-04-2014, 06:28 PM
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High RPMs, usually something simple like a sticking or improperly adjusted cable assuming the high rpms just started.

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post #6 of 12 (permalink) Old 03-04-2014, 06:28 PM
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The fact that its got 40k mi on it and has been sittin, tells me that it needs a major servicing....theres a whole buncha members in FLA that if ya ask nice would prolly come by and help ya out....thats why its always good to add your location to your profile....

Overheating could be many different things. Some serious some not...if that "mechanic" though it was a lifter, then it could be the water pump...its located front/right side of the engine by the rear brake lever. But if its spewin coolant, then like others stated, you either have a blockage, or are overfull.
As stated too, could just be air that needs to be burped...the coolant wont circulate right then, will overheat, and make the engine run like crap.



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post #7 of 12 (permalink) Old 03-05-2014, 12:27 AM Thread Starter
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Thank you all for your help. I'm going to get a buddy of mine to help me hopefully everything goes well. Will post results.
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post #8 of 12 (permalink) Old 03-05-2014, 01:46 AM Thread Starter
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I'm new to this site. I just added my area and need to get used to using and operating this site. If you know some FLA members and can could you tell them to send me a message on here?
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post #9 of 12 (permalink) Old 03-05-2014, 11:30 AM
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Im in SW florida, (just outside of Port Charlotte)

ball park of 90 miles give or take from you depending where in tampa area you are
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post #10 of 12 (permalink) Old 03-05-2014, 12:32 PM
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May be a bad radiator cap. Should send overflow into the tank, not spew all over.

Stuck or slow thermostat?

I've noticed the need to reset idle speed in changing air temps. And, when mine overheated with a dead fan, the idle stayed high, which is what first tipped me off to check the temp gauge.

If I set the idle before the engine is fully warm, it's idling too high once it fully warms up.

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