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  #1  
Old 09-21-2003, 10:51 PM
Mr2stroke's Avatar
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Default cr 125 wont start

Hey guys I was riding yesterday and the bike was working fine for about 3 hours then suddenly it wouldnt start anymore. I was trying to think about what I could of done to make it not work. About 2 hours earlier I went through about 3 feet deep water and lots of other deep puddles so I was thinking that maybe affected it, but then I dont see why it would run perfectly for an other hour. The last hour, I was riding it really hard through dry trails and then I stopped for a brake and it wouldn't start again. I took apart the carbutrator and cleaned it well. Also cleaned out the filter. I checked the spark plug and it looked oily, but I dont think its fouled because I can still see a spark everytime I kick it over. I actually started it today and it ran for 10 seconds then backfired and came to a sputtering stop. I looked behind me when it backfired and dirt shot behind me about 10 feet. I looked inside the whole exhaust and theres no sign of dirt so the dirt must have just shot off the bike somehow. Its almost like its out of gas or theres water in it . But if there was water in it I dont know why it would have ran for an other hour . I have lots of gas in my tank and the lines dont seem to be clogged. Anybody know whats up or what I can do to find out whats wrong with it? I have a 1983 cr 125. Thanks
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Old 09-22-2003, 01:14 AM
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Default Re: cr 125 wont start

I would try another plug just to be safe. Since you cleaned the carb, I don't think there's a problem there, but you might check the fuel petcock and see if it's plugging up. Other than that, you've covered all the bases it sounds like. If you don't want to pull the tank and petcock to check it, try pouring a little fuel down the cylinder and kicking the bike over. With fuel, air, and spark, it should run, and since this is an 83, you don't have to worry about a CDI! Good luck, keep us posted, and welcome to ATM! We hope you decide to stick around and join in the fun
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Old 09-22-2003, 06:22 AM
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Default Re: cr 125 wont start

It could be that the water screwed up the points in the ignition.

If compression is good, all you need is fuel/air/water/spark.

The fact that it backfired sounds like a problem with the ignition or reeds. Points ignitions seem to be more of a pain than CDI igntions, but they are usually easier to troubleshoot. Make sure the timing is right and the reeds are not cracked.
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Old 09-22-2003, 10:54 AM
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Default Re: cr 125 wont start

Ya, im pretty new to dirtbiking so I dont know many things yet. How do you set timing?. I just ordered a manual off ebay but, I havent got it yet. What is the fuel petcock?
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Old 09-22-2003, 12:48 PM
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Default Re: cr 125 wont start

Thanks for answering guys. Ya Im new to dirtbiking so I dont really know much yet. How do you set your timing and what is the fuel petcock. I just ordered my bikes manual off ebay so I should be getting that soon.
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Old 09-22-2003, 12:49 PM
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Default Re: cr 125 wont start

Something is wrong with this site at least for me. When I post a reply I cant see it after and I cant even find my forum unless I search for it.
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Old 09-22-2003, 12:58 PM
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Default Re: cr 125 wont start

I bet a new sparkplug fixes the problem. If that doesn't fix the problem, I would say you got water in the stator cover and need to remove the side cover and let it dry out.
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Old 09-22-2003, 01:22 PM
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Default Re: cr 125 wont start

the fuel petcock is the little valve that turns the gas on or off. there is a little filter in there, and when it gets clogged, fuel flow is restricted.

First, replace the sparkplug.
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Old 09-22-2003, 06:39 PM
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Default Re: cr 125 wont start

Ok, nevermind it was only the spark plug.Thanks for helping. Im glad it was only the spark plug. What should I do to prevent future foulings. I heard that the cr 125 fouls plugs a lot. Is this true? I cant even see the white thing on the plug.Its too oily and its only about a month old. Does this mean I should set the jetting leaner?
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Old 09-22-2003, 07:49 PM
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Default Re: cr 125 wont start

no it is not true, the cr or any other bike does not foul plugs. what fouls plugs is bad jetting. you need to raise the clip on the needle. go one position at a time. when you get all the way to the top if the problem still exists install the next smaller main jet. remember to put the clip back into the middle position.

if you ride at low rpm's then turn out the air screw. turn 1/2 screw at a time and see if it is any better. if you get more than 3 turns out from fully in then you need a smaller pilot jet

your plug insulator should be a tan color. whitish is too lean and black is too rich. rich is too much fuel, lean is less fuel
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