Valves Has Quit Moving - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 05-11-2011, 01:52 AM Thread Starter
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Valves Has Quit Moving

Well I was on my 45 mile trip to class to take my final exam. I get about 7 miles from the exit and my bike just all of a sudden loses power and starts to bog. I kept going those last 7 miles to get to the school and called for a friend to come rescue me and my bike. This happens Monday evening, and Tuesday afternoon I start to mess with the bike. I was thinking that maybe there was a problem with the carbs so I took them of, tore them apart, and realized the diaphragms were still in good condition. Well I then put the carbs back on the bike and tried to fire it up again, and there was nothing. Then I decided to check for spark, and the spark was consistent and strong on all 4 plugs. I was trying to figure out what the problem was at this point in time so I decided that maybe it just isn't getting fuel. Pulled the tank off the bike and with the vacuum line on the petcock I created a vacuum on it, and well fuel flowed without a problem. I then decided to pull the carbs again and looked in the hole on the cylinder (rear) and crank the motor. Well both valves moved up and down with no problem at all. I then did the same thing to the front cylinder, and you guessed it correctly NO MOVEMENT AT ALL.

Before I decide to tear into the motor to try to figure out that the problem is here I'm needing some ideas on what could cause my valves not to move at all. They are in the down position. I want the ideas basically so I can price parts out to see how much it is going to cost and all to do the repairs. That and it's going to be a couple months till I get the money to do these repairs so it will give me time to research all options that y'all give me on what the problem could be.

Now I did forget to mention that I did remove the plugs 1 at a time and did a compression test. All 4 plug holes have compression so I know we are good to go there.

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

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post #2 of 16 (permalink) Old 05-11-2011, 07:10 AM
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1988 VN750[SIGPIC][/SIGPIC]

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post #3 of 16 (permalink) Old 05-11-2011, 02:00 PM
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Or pull the cover off and see if the rockers slid off of the end of the Valves.
There is a couple here who knows about not getting them seated good before putting the cover on.

JaY



"Veronica"
2002 VN750 Vulcan
Rebuilt Engine
ACCTs lubed w/TOC Springs
Pick-up Coils Gapped at .018"
Splines Lubed
Deka MF AGM EXT15L Battery
NGK Iridium IX Spark Plugs
R/R Relocation Fix
New Rear Rack
Stock Seat Repadded
Ext-BackRest
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post #4 of 16 (permalink) Old 05-12-2011, 06:32 PM Thread Starter
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Plus side is the chain is not broke at all. Possibility that the hydraulic lifters are bad?

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

Proximity Construction
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post #5 of 16 (permalink) Old 05-13-2011, 01:03 AM
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Well there is a proper way to do them:

Bleeding Hydraulic Adjuster - Tech Tip
https://www.vn750.com/forum/showthread.php?t=10887

Quote:
Originally Posted by NetMatrix View Post
Plus side is the chain is not broke at all. Possibility that the hydraulic lifters are bad?

JaY



"Veronica"
2002 VN750 Vulcan
Rebuilt Engine
ACCTs lubed w/TOC Springs
Pick-up Coils Gapped at .018"
Splines Lubed
Deka MF AGM EXT15L Battery
NGK Iridium IX Spark Plugs
R/R Relocation Fix
New Rear Rack
Stock Seat Repadded
Ext-BackRest
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post #6 of 16 (permalink) Old 05-29-2011, 01:22 AM Thread Starter
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Ok well tore the bike apart tonight finally, and gave it a closer look. The lower chain is broke, and is in need of being replaced.

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

Proximity Construction
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post #7 of 16 (permalink) Old 05-29-2011, 03:08 AM Thread Starter
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I did a search on here, but unable to find the thread that a member posted about replacing the cam chains. I could have sworn I say one on here at some point in time. I might not have typed it in correctly on the search feature, but if someone knows where it is at can you please post the link on here for me? Thank you.

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

Proximity Construction
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post #8 of 16 (permalink) Old 05-29-2011, 08:50 AM
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Last edited by FlacoLove; 03-25-2013 at 10:07 AM.
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post #9 of 16 (permalink) Old 05-29-2011, 12:28 PM
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Quote:
Originally Posted by FlacoLove View Post
Bro. do yourself and your bike a great favor and invest in a Kawasaki VN750 manual. It gives detailed info on it's procedure (with do's and don'ts). ebay? Ride safe.
Or download one:
https://www.vn750.com/forum/showthread.php?t=17667

Gordon

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


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #10 of 16 (permalink) Old 05-29-2011, 04:25 PM Thread Starter
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I got the manual downloaded, and I'm using it, but the thread that is on here about the member that has to replace the chain there was damage that was taken pictures of that I want to check out on what possible damage could have occured. It's going to be a week or so till I actually tear the motor completely apart and everything.

1990 Kawasaki Vulcan 750
12,000
English Version

ACCT to MCCT conversion video
https://www.vn750.com/forum/showthread.php?t=18235

ACCT to MCCT Conversion Thread created by wib714
https://www.vn750.com/forum/showthread.php?t=17917

Proximity Construction
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