Coolant Leak - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Engine / Exhaust / Cooling
\ From the radiator, through the case and out
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post #1 of 3 (permalink) Old 05-18-2019, 10:09 AM Thread Starter
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Garage
Coolant Leak

Over the past couple weeks, I've noticed a faint hint of antifreeze smell while driving. I haven't overheated, and the total coolant level is still safe, so I wasn't overly concerned. Today, I found the leak! If you can't see in the picture, that is the left side rear cylinder head. It's leaking right where the coolant line comes into the cylinder head.

What's the best way to fix this?
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'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
22490.0+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/140 NO shims 45MPG
MCCT conversion

Planned modifications:
Custom LED turn signals
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post #2 of 3 (permalink) Old 05-18-2019, 10:52 AM
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Pull the tube, clean the hole and the tube. Get a new o-ring, coat the tube with vaseline, re-install. I even put two o-rings on one tube, there's plenty of room.
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Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
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post #3 of 3 (permalink) Old 05-18-2019, 03:37 PM
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The rear coolant tube is prone to leak even when new. I've had 2 new VN750s, and noticed you could wiggle the tubes and they would leak slightly. There should be a tab welded to that tube that a bolt goes through to attach it to the head so it doesn't move around.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
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