Blown head gasket - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 06-15-2011, 09:30 AM Thread Starter
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Angry Blown head gasket

My bike is overheating. Has coolant, oil but over heats bad. Could this be a blown head gasket? What r the symptoms of a blow head gasket and process changing?

Video I shot and edited of my 1985 Vulcan VN750


mounted iphone gps for speedo and milage
custom seat mod
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mosfet r/r
gauges and dash removed
baffles drilled
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post #2 of 15 (permalink) Old 06-15-2011, 09:37 AM
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Quote:
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My bike is overheating. Has coolant, oil but over heats bad. Could this be a blown head gasket? What r the symptoms of a blow head gasket and process changing?
How about a stuck thermostat?

JM2001

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2001 Vulcan 750
marbled
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Air/fuel mixture set to 2 1/2 out
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splines lubed
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post #3 of 15 (permalink) Old 06-15-2011, 09:46 AM
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How about a stuck thermostat?
Easily checked, just pull it and ride... If it runs cool, install a new thermostat, but check it in heated water before installing...
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post #4 of 15 (permalink) Old 06-15-2011, 09:48 AM Thread Starter
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Thermostat

Doesn't the thermostat just control the fan? My fan is manual.

Video I shot and edited of my 1985 Vulcan VN750


mounted iphone gps for speedo and milage
custom seat mod
stator replaced
mosfet r/r
gauges and dash removed
baffles drilled
synth oil
ear shave
de goat
412 progressive 11" shocks
Custom paint
NGK Iridium Spark Plugs
cam chain tightened

Coming soon:
spline lube
whitewall tires
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post #5 of 15 (permalink) Old 06-15-2011, 10:30 AM
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Quote:
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Doesn't the thermostat just control the fan? My fan is manual.
Are you blowing smoke ( white ) out your azz ( exhaust pipes ? ) LOL Are you leaking antifreeze near the top of the engine? If no, it's probably not a head gasket problem. Most Vulcans I have seen have electric fans. Where is your hand crank to turn the fan manually ? LOL

Seriously, I would check the thermostat and also check to see if your radiator needs flushing and cleaning. Make sure you are using a 50/50 mix of coolant.

JM2001

" Loud Pipes Risk Rights "

2001 Vulcan 750
marbled
TOC upgrade on ACCT
Air/fuel mixture set to 2 1/2 out
rectifier relocated
splines lubed
iridiums
decals removed
upgraded mirrors
Pic up coil mod done
degoated
All LED lighting
Upgraded Mosfet rectifier
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post #6 of 15 (permalink) Old 06-15-2011, 11:04 AM
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Fan switch is a likely culprit - you can put on a manual one pretty easily ( I may have a spare switch sitting around, but would have to check). Also, if you changed the oil recently, you may have a bubble in there and need to "burp" the system.

C
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post #7 of 15 (permalink) Old 06-15-2011, 11:05 AM
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Quote:
Originally Posted by stereopath View Post
Doesn't the thermostat just control the fan? My fan is manual.
The wire attached to the thermostat housing controls the temp gauge on the dash.

The cooling fan switch is located at the bottom left side of the radiator.

Gordon

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Purchased May 16, 2008
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post #8 of 15 (permalink) Old 06-15-2011, 11:30 AM
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Compression check should help you identify a headgasket issue, looks like the others have you covered nicely on the thermostat issues.

'98 VN750, Mustang Seat, F&S Engine Guards, Highway pegs, Pro-Tac backrest, Harley 58121-85B windshield lowers, Autometer 3391 voltmeter, ACCT to MCCT, pickup coils at 0.020", Coasters, National Cycle N2220, Vista Cruise Universal, Single Filter Ear Shave, Givi Monokey Sidebag Mounts, Givi E21 side bags, Knifemaker style turn signal relocation, helmet locks relocated.
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post #9 of 15 (permalink) Old 06-15-2011, 11:41 AM
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Quote:
Originally Posted by stereopath View Post
Doesn't the thermostat just control the fan? My fan is manual.
No, the thermostat is a mechanical valve that controls coolant flow. It's designed to open at a certain temperature. If it does not open at this temp. your liable to have the issues stated.

How a Thermostat Works

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post #10 of 15 (permalink) Old 06-15-2011, 11:48 AM Thread Starter
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No leaky coolant, or white smoke.

Video I shot and edited of my 1985 Vulcan VN750


mounted iphone gps for speedo and milage
custom seat mod
stator replaced
mosfet r/r
gauges and dash removed
baffles drilled
synth oil
ear shave
de goat
412 progressive 11" shocks
Custom paint
NGK Iridium Spark Plugs
cam chain tightened

Coming soon:
spline lube
whitewall tires
stereopath is offline  
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