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TOPIC: omc points, timing & coil test

omc points, timing & coil test 01 Apr 2020 11:04 #103347

SeanDrives4Fun wrote: Thank you Vin Tin!
This saves me buying a bunch of coils for no reason. I get 7.5 on primary set at 200 range. Now that I have accurate testing, I'm anxious to get back to the set of coils on my motor and start over!
Next I'll ask you how to get my idle stop to work lol






I might have missed something but, Dan said 0.4 to 0.7 (he just left out the 0 before the decimal point) and you got 7.5 :hmm:
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Last edit: by Locomotion.

omc points, timing & coil test 01 Apr 2020 02:34 #103344

Thank you Vin Tin!
This saves me buying a bunch of coils for no reason. I get 7.5 on primary set at 200 range. Now that I have accurate testing, I'm anxious to get back to the set of coils on my motor and start over!
Next I'll ask you how to get my idle stop to work lol

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Sean

omc points, timing & coil test 31 Mar 2020 18:34 #103336

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SeanDrives4Fun wrote: My fancy auto range Sperry dsa 500 meter showed no reading on secondary, today I tried an older digital sperry DM -500 meter and found this:

I just don't know if this us good or bad!
I got the same reading ground to barb as I did ground to spark plus boot.


That is a good reading. 4,600 Ω.
You should get the same readings from the barb to ground and spark plug boot to ground. The reason is the spark plug wire has almost zero resistance especially compared to 4.6KΩ

What's the other secondary read?

Then put the vom scale on 200Ω and read the primaries. They should be in the neighborhood of .5Ω to .7Ω
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Last edit: by VinTin.

omc points, timing & coil test 31 Mar 2020 17:53 #103335

My fancy auto range Sperry dsa 500 meter showed no reading on secondary, today I tried an older digital sperry DM -500 meter and found this:

I just don't know if this us good or bad!
I got the same reading ground to barb as I did ground to spark plus boot.

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Sean

omc points and timing 29 Mar 2020 18:42 #103295

Burned points are a sign of a bad condenser, here is all you could ever want to know about magneto ignition systems :biggrin:

www.themagnetoguys.co.uk/condensers-theory
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omc points and timing 29 Mar 2020 15:37 #103290

I also have had issues checking the secondary. It helps to have an auto ranging meter, I do not.

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omc points, timing & coil test 29 Mar 2020 15:34 #103289

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SeanDrives4Fun wrote: Filed points, timed with a buddies tool.
Tested coils, primary passed =Points lead / ground lead. Tested secondary (Ground to plug snap) and both coils failed. Didn't want to open that up today so I tested coils on my parts motor, they failed 2nd test also. Then I removed plug wires to access prong and both coils failed still. How important is this test?
note: reassembled my motor and drove it 38 miles yesterday LOL it does run rough at lower RPMs I think.


I believe ground to spark plug boot sound be in the 4 to 7 KΩ range.

What are you getting?

If you are reading open then maybe you need to go to a higher range on your VOM.

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omc points, timing & coil test 29 Mar 2020 14:13 #103285

Filed points, timed with a buddies tool.
Tested coils, primary passed =Points lead / ground lead. Tested secondary (Ground to plug snap) and both coils failed. Didn't want to open that up today so I tested coils on my parts motor, they failed 2nd test also. Then I removed plug wires to access prong and both coils failed still. How important is this test?
note: reassembled my motor and drove it 38 miles yesterday LOL it does run rough at lower RPMs I think.

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Sean

omc points and timing 22 Mar 2020 00:57 #103014

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SeanDrives4Fun wrote: Is there a way to set the point gap and then adjust the plate to get the timing correct by the pointer?


No. There is no easy way. The points would have to be movable on the mag plate, and they are not.

Use the timing fixture and let the point gap fall where it may.

The timing fixture used with a volt meter measuring resistance allows you to set the points so they open at the optimum timing. It is this initial opening that determines the timing of the spark in relation to the piston's location. Setting the point gap to .020 gets you in the neighborhood and the timing fixture gets you spot on. The magneto plate to which the coils, points and condensers are mounted rotates to advance spark at the throttle is advanced.

Next up you will no doubt be asking about synchronizing the high speed/low speed circuits which involves coordinating the relationships of the mag plate// boss mark on the block// throttle butterfly beginning to open. Proper adjustment here can make for an as smooth as possible transition from the idle circuit to the high speed circuit. The manual will give you a setting to get you in the ballpark but a little fine tuning from the exact factory suggested setting may get you a smoother transition between low and high speed operation.
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Last edit: by VinTin.

omc points and timing 22 Mar 2020 00:11 #103011

Set the points with a feeler gauge. If you have the special timing tool you can check your points setting using the marks on the edge of the magneto plate.
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John

1958 Vagabond II & 35 HP Evinrude
1955 PlastiCraft 12 Ft. Delux Runabout
1957 Clipper & twin 35 HP Evinrudes
1957 AlumaCraft 14 Ft. FD
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