2002 LT50 2 stroke CDI/Coil? Help Please - ATVConnection.com ATV Enthusiast Community



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Old 03-01-2017, 09:02 PM
Weekend Warrior
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Default 2002 LT50 2 stroke CDI/Coil? Help Please

I am new here just got a 2002 LT50 for the grandson. Looking for a little help.
I am trying to get it going but will not run.
Checks I have done
Compression good
Fuel good ( Even with starting fluid)
Spark has spark but looks weak to me but I am not used to looking at 4 wheeler spark.
Stator AC voltage around 50 volts when I pull the rope not real fast just a steady solid pull.
New Plug


I know the CDI is combined withy the coil. I was told replace the Coil/CDI and that would solve it but just want to get some other opinions before I sink $130 into it for a not sure.


I bought one of the cheapies off ebay for $12 and of course it did not work I should have known better. To good to be true. Anyone else had any luck with these?


Anyway I would appreciate any feedback. I searched here but most that replace the CDI have no spark. I have spark but does not seem strong to me but this maybe the way they are.


Thanks in advance for feedback!!
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Old 03-01-2017, 09:27 PM
Weekend Warrior
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One other thing I did was check the kill switches. Handlebar one is fine. The pull string one on back was taped up in a big ball so I disconnected and it still had spark so I left it at that. I did try and jumper the two wires thinking that would bypass the switch but that killed the spark. So I figure it must be a normally open contact.
Thanks
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Old 03-01-2017, 09:33 PM
Weekend Warrior
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The one in right is the eBay one. Left is the original.
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Old 03-01-2017, 09:35 PM
Weekend Warrior
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2002 2cycle
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Old 03-01-2017, 10:47 PM
Trailblazer
 
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Did you buy the quad non/running? What was compression reading? Does the plug look like fuel is getting to it? These are known for bad crank seals.
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Old 03-02-2017, 02:50 AM
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The spark doesn't look very bright on an LT50 but seems almost continuous when you pull with the plug out, like a model T Ford trembler. My guess is you have other problems.
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Old 03-02-2017, 10:05 AM
Weekend Warrior
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Bought not running but was a buddy and was running about 6 months ago. Plug doesn't really show much gas but it won't fire off even with starting fluid.

About 55 psi compression
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Old 03-02-2017, 11:25 AM
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55psi is low...you want 90 or better...time for a top-end refresh...
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Old 03-02-2017, 12:09 PM
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Yes top end is definitely where the problem is at.
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Old 03-02-2017, 12:55 PM
Weekend Warrior
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Well. That stinks. Guess I need to pull the head and see what's up. Is that the first step
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