Ignition Coil Gone Bad? - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums
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Old 06-28-2009, 08:30 PM   #1 (permalink)
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For the past few weeks I have had some trouble with my bike cutting out around 1/4 to 1/2 throttle. At first I thought it was a jetting issue but after trying about 40 different jetting combos (no joke) I decided to trouble shoot the electrical (tps, tors, battery, fuses, etc). I checked the ignition coil with an ohm meter the way the manual said to. I have a pdf service manual for an 04 however my quad is an 08 (don't know if that differs on the specs). The manual said that the primary coil resistance would read between 0.08 to 0.10 and the secondary coil resistance would be between 4.56 to 6.84. My results for the primary was 0.00 (which is the same reading I would get from the ohm meter if i would touch the positive and negative together by their self which i think that means it has no resistance). The result for the secondary was 5.74 which is according to spec. I am 100% positive that i checked it correctly. So does anyone know if this could have been my problem the whole time and any idea what could have caused this to happen? (since the quad is only a few months old)
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Old 06-29-2009, 07:12 AM   #2 (permalink)
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Old 06-29-2009, 01:47 PM   #3 (permalink)
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Coils are inexpensive and easy to replace, or borrow from a friend to trouble shoot the issue. But when I had similar problems, I found that the issue was the ground and not the coil. I had gutted my harness and didn't get it grounded very well, so the spark was weak and it would misfire in that same range. If your harness is stock I would inspect the small black ground wire that connects to the negative terminal on your battery. It is common for the bullet connector in that ground to go bad, or come apart.
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Old 06-29-2009, 05:18 PM   #4 (permalink)
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Ok I'll check that to, but when i checked the coil it was off the bike and it showed that itself was bad. Anyone know if this is a common problem or what could have caused it to go bad? Could it just been defective or could something else be messed up?
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Old 06-29-2009, 10:51 PM   #5 (permalink)
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Hey if there is anyone out there that has a coil that's easy to get to I would really appreciate it if they would check it with an ohm meter. To do this you take the positive ohm probe and touch it to the RIGHT tab inside the connector and black probe to the LEFT tab. The reading should be between .08 and .10 (resistance), that's to check the primary. That's what is not reading correctly on mine. It shows 0.00 when i check it. If anyone could do this for me I would greatly appreciate it.
Thanks
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Old 06-30-2009, 05:26 PM   #6 (permalink)
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Anybody out there?
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Old 07-19-2011, 09:56 AM   #7 (permalink)
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Default z yfz cutting out

Hi

What was it then??????//

Gordy
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Old 07-14-2013, 07:47 PM   #8 (permalink)
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we want to know! I tested mine! and its off specs to! it cutting when WOT
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Old 07-15-2013, 11:11 AM   #9 (permalink)
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you guys realize this thread was from 2009?

lol
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Old 07-15-2013, 12:42 PM   #10 (permalink)
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Quote:
Originally Posted by climb-101 View Post
you guys realize this thread was from 2009?

lol
Yes, what is the problem?
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Old 07-15-2013, 04:57 PM   #11 (permalink)
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Quote:
Originally Posted by goualon69 View Post
Yes, what is the problem?

no problem but chances are that this guy who posted this is no longer here, he has only 13 posts in 4 years
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Old 07-15-2013, 06:44 PM   #12 (permalink)
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Quote:
Originally Posted by goualon69 View Post
Yes, what is the problem?
If you are having the same problem replace the plug and see how well the coil grabs onto the new plug, I have worn out 2 coils after they wear flat spots in the plug and will no longer grab the new one.
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