Maintenance & Technical > KX500 Original
suddenly too rich
Hillclimb#42:
--- Quote from: tschisi on September 28, 2010, 09:32:01 PM ---
The next question is if the engine could have only 100psi without major visible damages on cylinder or piston?!
--- End quote ---
What if the head gasket still leaks? Can't imagine how you came to use starter fluid. Probably a bad idea. When head gaskets leak, they pop and hesitate a bunch, barely run. If you run the motor alot, it will start looking like it got beat with a ball peen hammer in there. I would start measuring cylinder, piston and their clearances. Pay attention to rings and top of cylinder and gasket. You can usually find issues with a keen eye like where the gasket is leaking, or where the cylinder has egg-shaped itself, or rings stuck in the piston. If it won't start you need to take it apart anyway. Time to order more top-end gaskets and don't bother reassembling until you find what doesn't belong. 90 psi is a problem.
DoldGuy:
--- Quote from: Hillclimb#42 on September 29, 2010, 12:11:22 AM ---
--- Quote from: tschisi on September 28, 2010, 09:32:01 PM ---
The next question is if the engine could have only 100psi without major visible damages on cylinder or piston?!
--- End quote ---
What if the head gasket still leaks? Can't imagine how you came to use starter fluid. Probably a bad idea. When head gaskets leak, they pop and hesitate a bunch, barely run. If you run the motor alot, it will start looking like it got beat with a ball peen hammer in there. I would start measuring cylinder, piston and their clearances. Pay attention to rings and top of cylinder and gasket. You can usually find issues with a keen eye like where the gasket is leaking, or where the cylinder has egg-shaped itself, or rings stuck in the piston. If it won't start you need to take it apart anyway. Time to order more top-end gaskets and don't bother reassembling until you find what doesn't belong. 90 psi is a problem.
--- End quote ---
I am with BDI on this one. If you do a leakdown test it would show a leaking head gasket (or whatever else needs attention) & stop the assuming its only low compression because of a loose topend.
DoldGuy
BDI:
I agree with the old guy. I would like to add if you are not sure about your gauge barrow a couple from some other buddies to make a comparison to yours. If you just barrow one then you will be scratching your head wondering who's gauge is right but if you have three and two of them say the same thing,then well. or just go buy a brand new gauge and screw it on your comp tester and check all your O rings. also week spark will make the bike run just like it does when it's to rich.
kaw rider:
these motors will run on 90psi. But the problems is your starting it with fluid. most of the time that means you have a big air leak or carb problems. Is it easy to kick over. I would add 2 oz. off oil down the spark plug hole when the piston is at TDC and see if the compression goes up when kicking it over with the compression gauge hooked up.
tschisi:
I also heard that they should run with 90psi, although this is not a good value, but it doesn?t. :-(
I checked everything x-times, the whole intake section for leaks, reeds (vforce and stock), jetting with chart, float, ohm-readings (also had a defective ignition coil, so it would be possible that it did damage to my cdi), ...
I have very much resistance on the kicker, but i heard this can be an indication ow low compression too?!
The surfaces of cylinder and head, where the head gasket is, look good and the gasket is new.
I also don?t lose coolant any more, and if i drain it it is clear.
Well, nothing but suggestion.
I will look for a second compression tester or another cdi to check.
Then thinking about splitting or re-plating. :x
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