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Post by keknw8 on Jun 11, 2021 14:15:16 GMT -5
coil has been removed from saw. using a multimeter at 20k ohm, i put the red(+) probe to spark plug terminal and black(-) to three points on coil. here are results:
various places on coil core: 0.0 ground lead: 8.20 primary coil lead: 8.20
if i'm getting a reading of 0.0 from coil core that means the coil is no good, yes?
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Post by keknw8 on Jun 13, 2021 19:00:48 GMT -5
i retested again, reread tests in manual vs jumping around on utube vids, i think user error on my part.
coil primary continuity: 2.1 secondary continuity: 8140 max secondary: 8140 condenser capacity: .17mfd
pretty sure this "coil/coil core" is still good.
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okie
Saw Builder
Posts: 199
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Post by okie on Jun 16, 2021 9:38:24 GMT -5
Seems to be a points type magneto.
does it produce a spark at the plug? (or what)
The real test is the operational one in the eq being tested.
I've got coil and magneto testers and have seen them test good in a tester and not perform properly in the equipment.
If your points are old replace them while you are bothering them. I only re-work old points as a temporary method to get the eq to the shop. I have all kinds of expensive points diamond coated files but I do not use them thinking it's a permanent fix.
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Post by Brennan on Jun 16, 2021 11:54:41 GMT -5
So I just brought a saw back by filing the points… while it won’t fix it permanently most of us don’t use these saws everyday and they will for years as long as it’s done correctly with a good file
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Post by sweepleader on Jun 21, 2021 10:27:26 GMT -5
I file points all the time, have since cars had them. Of course they should be replaced if they are bad but there is nothing about the point tungsten below the surface of new points that is different from the surface of new points. Tungsten will often oxidize if left for long periods, the oxide is a non-conductor. Filing removes the oxide layer and allows the points to function normally.
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Post by keknw8 on Jun 21, 2021 13:53:29 GMT -5
Seems to be a points type magneto. does it produce a spark at the plug? (or what) The real test is the operational one in the eq being tested. I've got coil and magneto testers and have seen them test good in a tester and not perform properly in the equipment. If your points are old replace them while you are bothering them. I only re-work old points as a temporary method to get the eq to the shop. I have all kinds of expensive points diamond coated files but I do not use them thinking it's a permanent fix. yes, it is a points type. i still have the saw broken down about half way so can´t test the spark operationally just yet. the saw had not been used too much so i think the points are still good. i do have a new breaker box with new points i can install.
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Post by keknw8 on Jun 21, 2021 13:55:30 GMT -5
I file points all the time, have since cars had them. Of course they should be replaced if they are bad but there is nothing about the point tungsten below the surface of new points that is different from the surface of new points. Tungsten will often oxidize if left for long periods, the oxide is a non-conductor. Filing removes the oxide layer and allows the points to function normally. good to know.
the old points look almost just like the new ones in the new breaker box. the saw has not been used much. it did sit in a garage a long time unused.
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