Maintenance & Technical > KX500 Original
Idle Dies Down
Paul:
Tomasaki, have the bottom end pressure tested. You're showing the classic signs of a leaking seal on the oil side of the engine. Also perform a compression test to ensure your compression is between 110PSI and 170PSI.
tomasaki:
Thanks Paul, But how do you check bottom end pressure??? I've never done a compression test either but it seems like you would just hook a gage to the spark plug hole and crank it.
Tom L.
Paul:
Thats correct, a compression tester plugs into the sparkpulg hole and you kick the engine over until the pressure no longer rises on the gauge. This will tell you if you're in the service limits of: 110psi - 170psi.
Everytime I do a topend on my bike I pull the piston and put the jug back on the engine. I have a pressure gauge that threads into the sparkplug hole and a rubber stopper (gotta love Home Depot :lol: ) that seals the exhaust port. I have a flat plate with a valvestem (like your car tire) in it that i use a bicycle pump with to pressurize the cylinder. Flat plate bolts to intake side of the cylinder. A couple pounds (ehh, more like 7 or so) is all it takes and then you just watch the gauge for bleed off. If everything is good then there shouldn't be any pressure bleed-off.
Good luck and we're here if you have more questions.
tomasaki:
Thanks again Paul!!! That all sounds easy enough! I'll call around and see if I can find a compression tester. The bottom end test will have to wait until I'm due for top end.
How does this all affect the idle? Other than the idle dying off, and the spark plug always being black, the bike performs outstanding.
jdv500:
hello ,
my 01 500 do'es the very same thing. as soon as i let go of the throttle it will pulse and rev on by itself... thanks, jdv
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