Author Topic: suddenly too rich  (Read 24970 times)

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Offline matzilla

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Re: suddenly too rich
« Reply #30 on: May 12, 2010, 05:40:36 AM »
my curiosity was related to whether it would hold the vacuum  if the crank was turning in the seals.

Offline maddoggy

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Re: suddenly too rich
« Reply #31 on: May 12, 2010, 08:49:28 AM »
turning the crank should make no difference in a leakdown test unless the sealing surface on the crank is in bad shape or grooved.

Offline tschisi

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Re: suddenly too rich
« Reply #32 on: May 16, 2010, 02:17:36 AM »
I have got the same problem, but so bad that there is no way to start the engine.

Have a look at this:
http://img189.imageshack.us/img189/9929/aaayx.jpg
Do you think the oil on the piston looks like a crank seal problem?

Arrgh.
Please save my day and say something like: "Replacing the seal takes about 5 minutes and the cases don?t have to be split."
2004 kx125
1990 kx500 (sold)

Offline tschisi

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Re: suddenly too rich
« Reply #33 on: July 08, 2010, 04:14:08 PM »
Have to write again.
I had my top-end removed and my crank seals are ok.
My head gasket was leaky so i had water in the crankcase, but it was clear and free of oil.
But the engine won?t start, checked everything.
 :? :? :?
2004 kx125
1990 kx500 (sold)

Offline Friar-Tuck

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Re: suddenly too rich
« Reply #34 on: July 08, 2010, 11:33:00 PM »
Hey T,
 There are five pages of troubleshooting (1st pg.) 
http://www.kxriders.com/coppermine/displayimage.php?album=259&pos=12

 Is there anything else that changed other than doing a top end?
"The Truth Has No Agenda"

Offline tschisi

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Re: suddenly too rich
« Reply #35 on: July 09, 2010, 02:10:54 AM »
Only got the VForce3 reeds, but have already been riding with them once or twice.

Spark and timing ok.
Float valve closes.
Fuel not too old.
Jetting done with correction chart.

I guess i?ll study yout link, thx for that!
2004 kx125
1990 kx500 (sold)

Offline tschisi

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Re: suddenly too rich
« Reply #36 on: July 20, 2010, 05:16:36 PM »
Hi again!

I tried the stock reeds, but the same problem.
Is ist ok for the intake port and reed cage to be wringing wet after kicking?
Or could this be a carb problem?
I?ll check my float height again.
Should it be changed by bending the bracket of the float?
« Last Edit: July 20, 2010, 06:30:26 PM by tschisi »
2004 kx125
1990 kx500 (sold)

Offline tschisi

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Re: suddenly too rich
« Reply #37 on: July 21, 2010, 04:38:41 AM »
Checked the float.
The conical upper tip of the valve is new and closes nice.
The float touches the lower tip of the valve at about 17-18mm, which should be not too bad if i got that right?!
I have no more ideas what to do with the bike.  :?
2004 kx125
1990 kx500 (sold)

Offline Friar-Tuck

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Re: suddenly too rich
« Reply #38 on: July 21, 2010, 04:42:00 AM »
Hey T,
 
 Read through this, It sounds very similar to your situation...
http://www.kxriders.com/forums/index.php/topic,6188.0.html
  (Flywheel key ?  C.D.I.)
   
I'm not sure, however you may be able to swap 250/500 c.d.i. for test.
  The only thing left is flywheel/mag...
  Tuck\o/

Also some float level "How To" post #3  :-D
http://www.kxriders.com/forums/index.php/topic,7731.msg59549.html#msg59549
« Last Edit: July 21, 2010, 05:44:16 AM by Friar-Tuck »
"The Truth Has No Agenda"

Offline tschisi

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Re: suddenly too rich
« Reply #39 on: July 21, 2010, 06:16:14 AM »
Flywheel should be ok, i just replaced the nut.
I also have a strong looking spark, so i guess the magnets and statot should be ok (suggestion, i know) ?!

CDI would be bad, i have no second one to test, and i think the 250?s wouldn?t work because that one uses the throttle sensor and stuff like that.
The 250?s wiring is about thrice the wiring of the k5...
Maybe the coil fits...

If it doesn?t, i will take the bike to the dealer for troubleshooting.
Some kind of giving up, but i?m out of ideas and want to ride it again!   8-)  :evil:  :mrgreen:
2004 kx125
1990 kx500 (sold)

Offline Polar-Bus

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Re: suddenly too rich
« Reply #40 on: July 22, 2010, 12:32:51 AM »
Not sure if this was already done, but why doesn't anyone suggest a Compression test ? It's simple, and should "almost" always be one of the first tests !

 If you trashed the rings, your engine will run rich and be hard to start.
« Last Edit: July 22, 2010, 12:36:19 AM by Polar-Bus »
01' KX500
'84 GPz1100
'87 GSX-R  750
'06 HD Fatboy
'73 Kawi H1
'03 CRG KX500 Shifter kart

Offline tschisi

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Re: suddenly too rich
« Reply #41 on: July 22, 2010, 12:39:33 AM »
No this hasn?t been done yet.
It feels like i have very much compression, nearly can?t kick the lever down.
Thought that couldn?t be bad?!

The only thing i really don?t know is if it?s ok for the intake port an reeds to be wringing wet after kicking several times?
« Last Edit: July 22, 2010, 12:45:34 AM by tschisi »
2004 kx125
1990 kx500 (sold)

Offline diesel

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Re: suddenly too rich
« Reply #42 on: July 22, 2010, 02:29:11 AM »
I'm not sure that anyone mentioned the other symptom of a bad clutch-side crank seal...you're exhaust will be spewing unpleasant smelling white smoke as the engine attempts to burn the transmission fluid.  Sometimes the smoke is the first indication that your seal is bad.

On the wet reeds and intake, it sounds to me like too much fuel is being supplied.  However, the only time I've run into a problem like this was on an LT250R Quadracer...the engine was an '85 with a hybrid case-reed/piston-port intake.  When the previous owner rebuilt the top-end, they didn't chamfer the port edges very well and the piston skirt snagged the intake port.  This broke off a section of the piston skirt on the intake side, which was eject out the exhaust and the engine continued to run as if nothing had happened.  Problem was, as the piston moved toward bottom dead center, instead of sealing off the intake and creating positive crankcase pressure to force air/fuel up through the transfer ports for combustion, a portion of the air/fuel was getting forced back out through the intake tract soaking everything in it's path with fuel.  The air filter was actually fuel soaked and a small puddle of fuel was visible in the bottom of the airbox.  The fix was a better chamfer on the bottom of the intake port, cylinder honing, and a new piston kit.  While I understand that this is a Kawasaki site, and the KX has reed-valve induction, I thought I'd share the info anyway, for the simple fact that more information is never a bad thing.

Offline Polar-Bus

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Re: suddenly too rich
« Reply #43 on: July 22, 2010, 10:20:13 PM »
No this hasn?t been done yet.
It feels like i have very much compression, nearly can?t kick the lever down.
Thought that couldn?t be bad?!

The only thing i really don?t know is if it?s ok for the intake port an reeds to be wringing wet after kicking several times?

Just because you "think" the compression "feels" good, doesn't mean it's within spec.  If you own a dirt bike, you should own a compression tester. A C/T will tell you a very quick story (both good and bad) about what's going on inside your engine. This whole thread makes me laugh, as you are suspecting every component but the one that most commonly fails.... the piston and or rings.  For the past 27 years, I have a method of after I purchase a fresh top end, I put about 5 hours on it, then do a compression test and write the number down for future reference. Sometimes I can run a bike for 3 or 4 years before a needed top end. So when I see the PSI has dropped substantially, I now know it's time for a new top end. I'm not saying you have a trashed top end, but what I am saying is just check the simple things FIRST.
01' KX500
'84 GPz1100
'87 GSX-R  750
'06 HD Fatboy
'73 Kawi H1
'03 CRG KX500 Shifter kart

Offline tschisi

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Re: suddenly too rich
« Reply #44 on: July 22, 2010, 11:16:55 PM »
Makes you laugh?
Cool, maye i should work on my comedian career instead of my mechanic skills.
 :roll:

My focus is on my wet intake port right now.
I still don?t know if that is ok.
Next thing is that the engine ran great till the end, maybe another indication of good piston and rings?
But sure you may be right, i guess on a k5 you don?t feel worn components like on a 125...

I?m glad that there are some things left that i can check...
2004 kx125
1990 kx500 (sold)