Maintenance & Technical > KX500 Original

how far a gap should my plug jump

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jdb1989:
cause it jumps short i have to touch it to the frame to get it to jump

95formula847:
+1 on this. im also interested

KXcam22:
I am not 100% sure what you are looking for.  A plug has to be grounded to the frame or engine for the spark to jump.  The coil usually delivers 20,000 to 40,000 volts to the plug.  With a screwdriver jammed in the plug cap I have seen the spark jump an inch or more to the frame.  On my sons XR200 I was kicking it over (flooded) to clear excess gas out of the cylinder. Spark jumped out of the empty cap to the frame (at least 2") and ignited the gas. Exciting!  The KX500 should show you a lively spark at the plug.  Sometimes it helps to turn out the lights to see it easier. Cam.

jfabmotorsports.com:
An instructor in high school electronic class told us that a good rule of thumb was 1/4 inch per 10,000 volts. That conferms Cams findings...+ or-  :wink:

azracer19:
You could always use the idiot technique.... ya i have been that idiot.. grab the plug gently kick the bike if your eart skips a beat  your good... its also a good way to get a girlfriend out of the house just have her hold the plug and see how far the jumps and then runs to her car

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