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Spark Plug boot internals

  • Mark Serotta
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Spark Plug boot internals was created by Mark Serotta

On my 78 dt125, I turned the brass fitting inside the plug boot and several parts came out. 
How do these parts go back together?
A picture of the parts is attached.

 

Mark S
Last edit: 13 Sep 2021 14:29 by Enduronut.
13 Sep 2021 13:05 #1

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Replied by RT325 on topic Spark Plug boot internals

Good question, i've had them apart but cant remember. Hope the thread is ok. I'd go little flat washer thingy, then spring coz you can see the circle where spring sat on the washer, then resister followed by screw. My guess anyway. It'll work whatever way providing there's connection. Check it with an ohms meter after. Otherwise just replace the lot with a solid rod of something. Pretty sure i've used thick bronze gas welding rod. Too long ago.
13 Sep 2021 15:17 #2

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Replied by MarkT on topic Spark Plug boot internals

Hard to tell without looking really close at parts like washer....

I'd guess spring, washer, resistor, screw.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
13 Sep 2021 18:48 #3

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Replied by pmb on topic Spark Plug boot internals

The first thing I would do is get a multi-meter and measure the resistor. I'm not sure what it should exactly be, but I would look for around 5k-10k ohms. If you can't measure the resistor it's probably broken. To my eyes, the little washer thingy looks like the end cap of the resistor. The other one is possibly up inside the spark plug boot. The resistor should either have lead wires or some type of conductive cap at each end. Like a small glass tube fuse. I hope I am wrong. 

I guess my answer to your question would be; resistor, washer thingy, spring and then brass screw   

 
The following user(s) Liked this Post: JayB
14 Sep 2021 00:30 #4

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Replied by RT325 on topic Spark Plug boot internals

Has anyone go one to pull apart. Ahhh, but then again we don't know if its been apart before & assembled wrong. So long as there's continuity with clean spring ends & the washer it should work whichever way. But good point PMB--is there another washer still down in there, like one washer each end of resistor. What happened to the good old days of a simple clip straight to the top of the plug. I think continuity would be 5k ohms, so need your tester on a high scale or might show as stuffed.
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Last edit: 14 Sep 2021 00:54 by RT325.
14 Sep 2021 00:51 #5

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Replied by SKYDANCER46 on topic Spark Plug boot internals

It goes 3,4,5 then 2. 
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14 Sep 2021 17:14 #6

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