Radiator explosion.... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 08-23-2011, 01:41 PM Thread Starter
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Radiator explosion....

Ok so first of all im new here. This forum has been a great help to me so far but i have not found a post with a similar situation as the one i am having so i decided to post for myself and maybe someone can help me.

I have a 1986 vn 750 with 9K miles. It runs absolutly great....untill the other day.

I was cruising along at 55 not working the motor or anything, and i noticed i was running fairly hot. As soon as i noticed it there was a huge cloud of steam and boiling coolant everywhere, soaking me, and scaring the **** outta me.

I trailered the bike home and got looking and noticed that there is a quarter sized hole in the top of my radiator. it kinda looks like it was shot with a gun from the inside out.

So, i clearly need a new radiator. I would also like to replace my cap and thermostat because that is probably the problem.

There was no oil in the coolant at all, but it was definately old looking. My fan works fine.

Other than the new parts mentioned and a coolant flush, is there anything else i should or shouldnt do?

Also....anyone got any of the mentioned parts for sale?? I refuse to pay 400+ for a new rad

thanks in advance,
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post #2 of 4 (permalink) Old 08-23-2011, 01:44 PM Thread Starter
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oh and my water pump impeller is fine.....no strange noises or leaks, or coolant in the oil
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post #3 of 4 (permalink) Old 08-23-2011, 02:06 PM
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Welcome to the Vulcan madness Simon.

The "old looking coolant" is a reminder to the rest of us to change it every few years, as the corrosion inhibiting qualities do deteriorate with time.

If you start a "Want to buy" thread in the Sell and Swap forum you will likely attract more potenial sellers for a rad.

A thermostat from a 79 thru 89 Honda Accord will work. Not sure about the rad cap.

Here is a link to a coolant change that may be of some help to you:

Enjoy the wrenchin` and ridin`!


1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


Last edited by OlHossCanada; 08-23-2011 at 02:13 PM.
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post #4 of 4 (permalink) Old 08-24-2011, 01:14 AM
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That could be indication of a head gasket internal leak. not to scar you but I have seen that in cars, or just a weak spot in the radiator.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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