Maintenance & Technical > KX500 Original
suddenly too rich
Polar-Bus:
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.
tschisi:
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?
diesel:
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.
Polar-Bus:
--- Quote from: tschisi 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?
--- End quote ---
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.
tschisi:
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...
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