Forum Main Tech Help/Race Shop 17 yz250 no spark found issue?

17 yz250 no spark found issue?

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kpersonius264

Vital MX member kpersonius264 61597 kpersonius264 https://p.vitalmx.com/photos/users/61597/avatar/c50_Screenshot_2017_04_17_17_14_21_1520751670.jpg?1520751404 https://www.vitalmx.com/community/kpersonius264,61597/all 01/17/18 12 243

Posts: 255

Joined: 1/17/2018

Location: Orangevale, CA USA

2/1/2019 5:01 PM

So last weekend in Oakland my bike died on the line for practice and I completely lost spark.

I am following the manual and a Rocky Mountain YouTube video for reference. I have tested the kill switch, the coil, and the spark plug cap which all came out good.

The red flag I noticed when I tested the stator is (2. In the manual) the “charging coil 1 resistance”

The book says it should be 720.0 - 1,080.0 ohms
My test said only 7.2 ohms.

The part throwing me off is Rocky Mountain’s video result brought them kiloohms and mine did not. It should do it automatically like my coil and cap did.

Did I find the culprit?


Here is a photo of the multimeter I’m using and a link to the video I used for reference.


Photo
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kpersonius264

Vital MX member kpersonius264 61597 kpersonius264 https://p.vitalmx.com/photos/users/61597/avatar/c50_Screenshot_2017_04_17_17_14_21_1520751670.jpg?1520751404 https://www.vitalmx.com/community/kpersonius264,61597/all 01/17/18 12 243

Posts: 255

Joined: 1/17/2018

Location: Orangevale, CA USA

2/1/2019 5:06 PM

If you can read my shitty hand writing on this dirty receipt I had stuffed in my manual here are all the tests I did minus the kill switch Photo

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kpersonius264

Vital MX member kpersonius264 61597 kpersonius264 https://p.vitalmx.com/photos/users/61597/avatar/c50_Screenshot_2017_04_17_17_14_21_1520751670.jpg?1520751404 https://www.vitalmx.com/community/kpersonius264,61597/all 01/17/18 12 243

Posts: 255

Joined: 1/17/2018

Location: Orangevale, CA USA

2/3/2019 7:58 PM

Nobody knows? I thought this place was full of industry people and professional mechanics?

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Paw Paw 271

Vital MX member Paw Paw 271 38400 Paw Paw 271 https://p.vitalmx.com/photos/users/38400/avatar/c50_Husky_TC_449_1526420797.jpg?1526420311 https://www.vitalmx.com/community/Paw-Paw-271,38400/all 04/03/13 12 12 3389 1 3

Posts: 3401

Joined: 4/3/2013

Location: Benton, LA USA

2/4/2019 8:36 AM

Looks like you may have a short or a bear wire or a bad connection.

Paw Paw

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sesker15

Vital MX member sesker15 9777 sesker15 https://p.vitalmx.com/photos/users/9777/avatar/c50_103977830_1288580130.jpg?1294183276 https://www.vitalmx.com/community/sesker15,9777/all 04/14/08 39 https://www.vitalmx.com/community/sesker15,9777/setup 50 832 210

Posts: 882

Joined: 4/14/2008

Location: Upper Marlboro, MD USA

2/5/2019 6:13 AM

Check and see if your woodruff key is broken.

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adam8781

Vital MX member adam8781 50033 adam8781 https://p.vitalmx.com/photos/users/50033/avatar/c50_11800243_10154046585496416_2865429292532496487_n_1450806541.jpg?1450806368 https://www.vitalmx.com/community/adam8781,50033/all 12/22/15 24 524 1

Posts: 548

Joined: 12/22/2015

Location: CAN

2/5/2019 1:13 PM

if you are saying what you are saying correctly than yes sounds like weak stator. 7.2 ohms is .0072 kiloohm. so you are testing wrong or your stator is toast.

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kpersonius264

Vital MX member kpersonius264 61597 kpersonius264 https://p.vitalmx.com/photos/users/61597/avatar/c50_Screenshot_2017_04_17_17_14_21_1520751670.jpg?1520751404 https://www.vitalmx.com/community/kpersonius264,61597/all 01/17/18 12 243

Posts: 255

Joined: 1/17/2018

Location: Orangevale, CA USA

2/14/2019 3:11 PM

Stator was bad. Tested another 250 and got the reading I was looking for. Replaced it and now she has spark again. Now I just need to make one of those spark plug hole dial bore gauges to set the timing. To those of you who replied, thank you.

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