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I read the info you posted on the 2002 400ex with no spark.

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Hello I read...

Hello I read the info you posted on the 2002 400ex with no spark. I also have the same model and year with no spark. I have a coil transformer and have fired the coil. I tested the blue/yel wire and have 245 ohms . The blk/w wire is open when key is on. So my question is when I have 55 less ohms om

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Sorry bumped the screen. Less than 300 ohms is it bad ?

Submitted: 2 years ago.Category: Motorcycle
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Answered in 1 hour by:
2/26/2016
Motorcycle Mechanic: Eric, Technician replied 2 years ago
Eric
Eric, Technician
Category: Motorcycle
Satisfied Customers: 1,567
Experience: MMI grad. 7 years experience in Honda, Suzuki, Yamaha, as service manager and tech.
Verified

Hello,

Its pretty hard to say if that ohms reading is indicating a bad coil. An obvious bad reading would be an open or extremely high or low reading. Your pretty close to the 300 ohm mark so I wouldn't look to that as an issue as of yet. When you test the blue/yellow wire, are you checking that at the ignition coil or the harness coming out of the engine? I would be interested in the ohms reading you get at the blue/yellow wire coming out of the engine. That is the pulser coil. Should be that and a green wire. Unplug those and test between that blue/yellow wire and ground. Any reading with that? Then check between that blue/yellow wire and the green wire. What reading do you get with that?

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Customer reply replied 2 years ago
I pulled the plug off at the CDI module and test from there. I tested between the two wires like you suggested and the ohms are the same . Is there a known value for the other wires. I think those have another winding that charges the cdi capacitors that fire the coil. Ken
Motorcycle Mechanic: Eric, Technician replied 2 years ago

what about the reading between that blue/yellow wire and battery or engine case ground?

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