It sounds as though you might have a blown head gasket or a cracked head. Do not run the motor until it is fixed as the coolant will work its way down ito the oil and distroy the bearing in the rest of the motor.
The spark plug gap for a 1986 Honda CR250 should be set at .024 inches. This is equal to .6 mm.
because you have a bad head gasket and oil and coolant are getting into the combustion chamber from the passages.
1997 Honda Cr250 2 Stroke Spark Plug Gap; this info is directly from the Honda Manual: 0.5 - 0.6 mm (0.020 - 0.024 in) Spark Plug Recommended: NGK - BR8EV
which plug? oil, coolant, vacuum, hydrolic, or spark?
Spark plug wire not connected to spark plug? Spark plug wire connected to Wrong spark plug? Vacuum line disconnected? Bad spark plug or wire?
Look at the starter or the spark plug
blown head or cracked block
If it's a V6 then it is in the right head by the back spark plug. ............V8..................................................... Front spark plug. This is you standing in the front of engine.
you're not getting it seated all the way. the clip has to snap onto the top of the spark plug.
my kx 250 is not getting spark
Pull the wire off the spark plug, pull the spark plug out, plug the spark plug back into the wire, then have someone turn the engine over. You should see a blue spark jumping around the very bottom of the spark plug.
To change the spark plugs in a Chevy Celebrity: 1. Give the spark plug boot a twist to free it up from the spark plug, then pull on the boot to remove the spark plug wire from the spark plug. 2. Use a 5/8" spark plug socket with an extension and ratchet or breaker bar to loosen then remove the spark plug. 3. Set the gap on the new plug to .045" then screw it back into the spark plug hole in the head. Tighten the spark plug and replace the spark plug wire. I change the spark plugs one at a time to keep from getting the spark plug wires on the wrong spark plug.