Question about 1988 kawasaki VN 750 Vulcan

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The front cylenders are at 90lbs compression and the two rear are at 120. do i have a valve clogged ? they dont loose any preasure

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Sounds more like ring issue
poor some oil in cylinders , wait 5 minutes recheck (make sure you install plugs) if pressure is up it's rings if not probably valve (or melted piston)

Posted on May 27, 2011

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# 1 cylender not firing,low presure in that cylender,not buring oil


Low pressure I'm assuming you mean low compression. Do a "wet test" first. If compression is still low, check your valve adjustments. tight valves will cause low compression. Also has this engine been overheated badly,or have excessive mileage on it? Could be a head gasket, or damaged rings/cylinders.

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Low compression on #3 90lbs.


First thing that comes to mind, check valve adjustment to see if adjustment is too tight, causing valve to not fully close.

Pour a teaspoon of oil through spark plug hole in head and run compression test again.
If it jumps up, the rings are bad.

Finally, a "Leak-Down Tester" will help you pin-point the problem:

http://www.harborfreight.com/cylinder-leak-down-tester-94190.html

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There are MANY things that can cause misfires including ignition coils, spark plugs, ignition cables, valve timing, cylinder compression, etc.

The first thing I would do is to double-check to make sure you connected the ignition wires to the correct coils. If one is incorrect, you will have at least 2 cylinders that will misfire, and it is possible to have all 3 of them mixed up.

Other than that, I would say that you should look for a broblem that is causing ALL of the cylinders on the rear bank to misfire. One possibility is a loose timing belt that could have skipped a tooth, causing the valve timing on the rear bank to be out of time.

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88 t-bird non abs. the front brakes drag. i have replaced all rubber lines also new master cyl. new front brake calipers. rear brake hose preasure will bleed of after it has set for 15 to 20 min.can...


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Pressure is building up under valve cover. its pushing oil out. when opening oil cap lots of air comes out


either oil ports are clogged not allowing drainage? or compression is bypassing the rings placing it in the crankcase assy area, Meaning worn cylender or cracked ring most likely

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Low compression can be caused by a blown head gasket, cracked cylinder head, burnt or damaged valves, worn or cracked piston rings, scored block cylinders. In all this cases an engine would have low compression on all cylinders unless something major is wrong, or the compression gauge is not measuring properly. --------------

This will help. Thanks please keep updated.please do rate the solution if helped.thank you for using fixya.

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1995 Dodge ram 1500 V-8 5.9 litre 4x4 short bed is feels like it is bumping when the truck shifts into cruising gear and RPMs drop truck smmoths out when you speed up bumping goes away if you shift...


Perform compression check between cylenders #1 and #3. These are right next to each other.
You might get away with a head gasket replacement, if the compression between these cylenders is the same, indicating a blown head gasket between cyl.#1 and #3 not valves which will give different readins between these cylenders.

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I have a 1994 750 vulcan and rebuilt the front head with new valve and guides,lash adjusters and still it wont hold compression after i ride for a few minutes


If your able to ride it for a few minutes before loosing compression it tells me that you may have your valves adjusted too tight. And as things heat up the gap becomes less and less until it actually holds the valve open just slightly thus loosing the compression. Try adjusting them .002 looser and see if you are able to go further. Should tell you all you need to know. My next thought would be the base gasket under the cylender which I have seen cause intermittent problems.

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