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Author Topic: Kx250 No spark  (Read 4359 times)

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Offline Rocco H.

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Kx250 No spark
« on: August 01, 2017, 08:38:13 AM »
Hello everyone! :-D My name is Rocco. I am new to the kx riders forum, and I am excited to be a member. I have a 1990 Kx250 that I got back in early January as a basket case. Rebuilt the whole bike, and when I went to try to fire it up for the first time, I found out I had no spark. I tested the ignition coil first and it was bad, so I bought a cheap Chinese coil to just get the bike going. The ohms on the new coil were within spec, went to fire it up and still no spark :-P. The stator I bought off ebay. The coils were both rewound, and the pulse coil seems to be fine as all the resistence's were within spec on the stator. So I tracked it down to the cdi. Found one cdi for my bike on ebay, used, and bought it. STILL NO SPARK :? I am so confused. The cdi''s for this bike are discontinued and aftermarket ones are hard to find to! Anyone have any ideas or recommendations, things I could try. Thank you very much, Rocco.
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Offline reklessj

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Re: Kx250 No spark
« Reply #1 on: August 01, 2017, 09:00:51 AM »
Welcome aboard!! Check all ground and connections thoroughly!! Also it does have a brand spanking new plug right
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My rides: 1994 KX500, 1988 T4, 1998, ZXI 1100 JETSKI, 2003 MOUNTAIN CAT 900
WIFES (Baby Fiver) rides: 2004 KTM 105SX,1992 LT250R, 1995 ZXI 900 JETSKI,  2011 RMK 600
SONS ride: 1995 YZ125,2002 RM 250
other rides: 2007 RMZ450 RC Ediition, 2003 RMK700

Offline Rocco H.

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Re: Kx250 No spark
« Reply #2 on: August 01, 2017, 10:35:10 AM »
"Welcome aboard!! Check all ground and connections thoroughly!! Also it does have a brand spanking new plug right"

Hi. Thanks for the quick reply. I have tested all the connections with a test light and they are all good. Has a brand new spark plug on it, even tested it on another bike. Ive checked all my grounds, and I even ran are wire from one of my engine bolts to the ignition coil to ensure there is a good ground. I was wondering though if there has to be a frame to engine ground, so does the engine have to be touching bare frame metal?
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Offline reklessj

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Re: Kx250 No spark
« Reply #3 on: August 01, 2017, 10:47:44 AM »
I tried a cheap cool with no results and the bought OEM no problems after that. Not saying that's what it is! There is an awesome electrical breakdown sandblaster did on here somewhere, hopefully he can point ya in the right direction
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My rides: 1994 KX500, 1988 T4, 1998, ZXI 1100 JETSKI, 2003 MOUNTAIN CAT 900
WIFES (Baby Fiver) rides: 2004 KTM 105SX,1992 LT250R, 1995 ZXI 900 JETSKI,  2011 RMK 600
SONS ride: 1995 YZ125,2002 RM 250
other rides: 2007 RMZ450 RC Ediition, 2003 RMK700

Offline Rocco H.

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Re: Kx250 No spark
« Reply #4 on: August 01, 2017, 11:08:01 AM »
That is something to consider. I heard that you could try to test the voltage coming out of the cdi with a test light, right? Does there have to be a good engine to frame ground?
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Offline umberto

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  • First Ride 02-02-19
Re: Kx250 No spark
« Reply #5 on: August 01, 2017, 12:48:38 PM »
You can find that troubleshooting guide, and lots of other good tips in our How To section. 

http://www.kxriders.com/forums/index.php/board,57.0.html
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Perhaps I have a dirt bike addiction?

03 KX 250/88 KX 525/2017 KX250F - Goliath
17 KX250F/04 KX250
04 KX 250 - Lunchbox's Bike
05 KX 125/144

Offline Rocco H.

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Re: Kx250 No spark
« Reply #6 on: August 01, 2017, 03:24:37 PM »
Thanks. Was looking at that guide before. It's great!
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