BMW K bikes (Bricks)

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1Back to top Go down   spark checker Empty spark checker on Fri May 27, 2011 8:55 am

Gardell

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Two very simple things I used to check ignition.
I cut thru the threads of 2 old sparkplugs (about halfway back) and broke off the insulator leaving the post sticking out, after cleaning things up I put the plugs in the wires for cyl 2 and 3 and measure the total resistance of wires and coil, by attaching the multimeter to the post sticking out of the plug. should b about 20k ohms. Same thing for cylinders 1 and 4

The other thing is to pull all 4 plugs, reattach them to the wires and connect the threaded section of each plug togather with a length of bare solid copper wire. It does not need to connect to the engine just to each other. Crank the enginge there should be a nice fat blue spark.

Sorry no pictures

    

2Back to top Go down   spark checker Empty Re: spark checker on Wed Aug 17, 2011 9:02 am

dinos735

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Seem like a real simple thing to try. I have always used a screw driver in the wire and check for the blue spark when turning over. Never measured the coils that way. Sounds pretty good.

    

3Back to top Go down   spark checker Empty Re: spark checker on Wed Aug 17, 2011 10:58 am

Gardell

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It took me quite a while to figure out that the screw driver in the spark plug boot next to the engine trick only works if there is a good spark plug installed on the other side of the same coil

    

4Back to top Go down   spark checker Empty Re: spark checker on Thu Aug 18, 2011 6:58 am

dinos735

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that is true my friend. I always keep a known good plug around. But that is true only if your coil is feeding two plugs. If there is only one plug per coil then it's a reasonable test.

    

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