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April 5th, 2015, 03:22 PM
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ninjette.org guru
Name: Ryan
Location: Sacramento, CA
Join Date: May 2009 Motorcycle(s): 2007 EX250 (street), 1994 EX250 (Race), 2008 250R (Race), 2000 250 (project), 1991 EL250 (a cruiser!) Posts: 287
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How To Bench Test Ignition Coils?
I'm having some issues with my bike and one of the diagnostics I want to perform is testing the ignition coils. So far I've attempted the alternate test procedure listed in the manual and can't get it to work (maybe that's my issue). When measuring from the coil terminal and the primary winding terminal I read infinite resistance, actually just 1___. When I measure across the two primary winding terminals I get a reading of 3.8ohms. I did this on my 2007 as well and got similar results.
I measured the Secondary wiring and just got another infinite reading... Am I doing this wrong? Is there another way to test this at home?  
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AFM #867 (5309) |
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April 5th, 2015, 03:49 PM
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#3 | |
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ninjette.org guru
Name: Ryan
Location: Sacramento, CA
Join Date: May 2009 Motorcycle(s): 2007 EX250 (street), 1994 EX250 (Race), 2008 250R (Race), 2000 250 (project), 1991 EL250 (a cruiser!) Posts: 287
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Quote:
1___ vs __3.8 <-- an actual reading where the underscores are not really there.
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April 5th, 2015, 04:06 PM
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#5 |
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ninjette.org guru
Name: Ryan
Location: Sacramento, CA
Join Date: May 2009 Motorcycle(s): 2007 EX250 (street), 1994 EX250 (Race), 2008 250R (Race), 2000 250 (project), 1991 EL250 (a cruiser!) Posts: 287
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yeah, for that step I'm on 20ohms versus 200, 2k, etc.
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April 5th, 2015, 05:24 PM
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#6 |
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wat
Name: wat
Location: tustin/long beach
Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much.
Blog Entries: 5
MOTM - Oct '12, Feb '14
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did you clean the surface you're probing? is it covered in some kind of insulation?
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April 5th, 2015, 07:05 PM
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#7 |
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ninjette.org guru
Name: Ryan
Location: Sacramento, CA
Join Date: May 2009 Motorcycle(s): 2007 EX250 (street), 1994 EX250 (Race), 2008 250R (Race), 2000 250 (project), 1991 EL250 (a cruiser!) Posts: 287
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The surface is clean, bare metal.
Testing per the directions (method A):  Testing contrary to the directions (across the two posts):  Testing per the directions for the secondary windings (method B):  All pictures are linked thumbnails to larger versions of the images.
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AFM #867 (5309) |
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April 5th, 2015, 09:00 PM
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#8 |
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wat
Name: wat
Location: tustin/long beach
Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much.
Blog Entries: 5
MOTM - Oct '12, Feb '14
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i think that just means you need to switch to a higher magnitude setting... see how it says it should be 16kohms, you want to use the "20k setting"
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April 5th, 2015, 10:09 PM
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#9 |
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ninjette.org guru
Name: Ryan
Location: Sacramento, CA
Join Date: May 2009 Motorcycle(s): 2007 EX250 (street), 1994 EX250 (Race), 2008 250R (Race), 2000 250 (project), 1991 EL250 (a cruiser!) Posts: 287
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I've done that for testing the secondary wiring, method B. There's no change. The scale for the primary windings is in the single digits.
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