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  #1  
Old 01-10-2008, 09:48 PM
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Default Honda cr125 won't start

Hi first post, I bought a 1990 cr125. It started up and ran fine but a little rough. The air screw was turned all the way clockwise. Turned 1/4 of a turn and it smoothed out some. Turned it another 1/4 turn and it smoothed out even more. Took it out riding wow! was it a blast. Having only owned four strokes this was an eye opening experience! it ran for 45 minutes. then stopped and I couldn't start it. The plug fouled out. I probably need to turn the air screw out another 1/4 turn. The plug was a br9eg. The gas I put in it was 93 octane. I mixed it 32/1. I popped in a br9es ( this is what I bought (they are cheaper)). It fired right up! and lasted for about 10 minutes before it fouled out again... Not too worried at this point. I knew there were still plenty of kinks to work out. A little history the previous owner said there was about 10 hours on a new top end. And has a fresh clutch job. I took the bike home and it sat around for a few days. The bike has a really short DG silencer on it. I looked it up and it is inteded for my bike. I opened up the silencer and it looked like crap. I bought new packing and repacked the pipe after cleaning it with Kerosine. (When I rolled the packing on I rolled the softer side facing out). I put a new fresh br9es plug in it. And adjusted the air screw to one full turn. I checked the idle setting on the choke knob it was unscrewed until about 2mm of the choke stem was showing. (the bike does not idle even when working, previous owned claimed it was set up that way on purpose) I pulled out the choke. I began trying to start the bike and it just would not start. It has in my opinion plenty of compression. The kick start is smooth and not too easy to kick. I kicked on that thing for a good 15 minutes. I alternated giving a little gas with the choke in and out. I also tried bump starting the bike in second gear about 15 times. I pulled the plug out and it didn't look fouled. The threads had a little black residue but thats it. I could see a little gas on the plug... fuel cock is open... I even tried disconnecting the kill switch just in case it is faulty. So what gives why won't it start?
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Old 01-11-2008, 02:39 AM
garvbox's Avatar
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Default Re: Honda cr125 won't start

My best guess would be that You have a faulty electronics issue. Have you checked if you have spark?

I have a 1991 CR 250 that I bought last year and it wasnt very well taken care of. It had issues similar to yours and when it fails to start (which can happen a lot) I always check electronics first, you gotta remember how old the wires are by now, and all the connections are probably corroded, making it very easy to lose power/signal.

Enjoy the bike btw, I love mine, its so easy to work on!!
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Old 01-11-2008, 03:11 AM
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Default Re: Honda cr125 won't start

by now the crankcase may be full of fuel. the airscrew you are talking about usually has a stock setting of 1.5 to 1.75 turns out. if you are getting fuel on the plug i wouldnt buy anything until you set the float. if you look in the knowlege base here you will find a really good pictorial by faded on the subject. set yours at 16mm. the pj carburetor that comes on those is problematic as it ages. you mentioned the choke. screw that thing down tight. it wont even try to idle but it may run without fouling longer. that idle is part of the choke/enrichenor circuit. good carburetor except for that.

as Gar mentioned, check for spark along the way, and clean all the connections, particularly sand the ground at the coil.
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Old 01-11-2008, 07:09 AM
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Default Re: Honda cr125 won't start

Same was happeing to my bros Cr 125, it just needs a hotter plug, fire a br8es in there and i bet its alot better....
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Old 01-11-2008, 11:13 AM
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Default Re: Honda cr125 won't start

Forgot to mention when I pulled the plug I also checked the spark. I don't have a good ref point but in my opinion it seems to be a strong spark. (It's blue in color). BTW I didn't set the gap in these spark plugs (the br9es). Just used them right out of the box. I'm also concerened that my cold starting procedure is off and I may be flooding the bike. Should I try without the choke first? Should I try with the throttle slightly on? Or straight away use the choke? Also I've heard that you can un-flood a bike by kicking it a few times with the spark plug out... True?
Things I'll try when I get home tonight:
Look at the float level and overall cleanliness of the carb.
Look for loose or dried / cracked wires.
Pull the reed and see if it looks cracked or worn out
Look at the pilot jet to see if it looks clogged.
Pull the top end off to see if I have a blown ring. ( I heard you have to drain the radiator before you pull the top end off)... True?
I also may try the br8es.
I halfed the cost of this this bike with a friend to be a community bike for our buddies who don't have bikes to ride. $500. I'd like it to be running for tommorow afternoon. So I'll definately repost later on tonight with my findings. Thanks for all the help. -J

Last edited by Manther; 01-11-2008 at 11:50 AM. Reason: typo
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Old 01-11-2008, 02:13 PM
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Default Re: Honda cr125 won't start

If it is cold out,,kicking the bike with the plug out will at least warm you up. while you have the reed box out see if there is any fuel or fuel and oil in the cases with a straw. blow it out or turn it upside down outside if there is.

the hotter plug is a BANDAID for one that overfuels. It can work sometimes for awhile. i use hotter plugs if i am going to jet for them or be running really slow tight stuff for a longer than norman time period.

definitely screw the choke down tight. if your cases are clear, use the choke to start and roll on throttle ONLY when you feel the bike try to fire.

hot , no choke and full throttle. you cant hurt it by trying that first off.
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Old 01-11-2008, 05:25 PM
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Default Re: Honda cr125 won't start

Not sure if it would be the same gap as the BR9EG, but the gap for that is .019-.024"

Yes, you have to drain the coolant before taking the cylinder or head off.
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Old 01-11-2008, 07:18 PM
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Default Re: Honda cr125 won't start

Well I got home tonight and put in a fresh plug left it un-choked, kicked it one time and it fired right up.... Maybe I just flooded it last night... I wonder if I should run it dry every time I'm done riding it? I figure the fuel drips down into the crank casing all night and floods that chamber. Just an idea. But I like the bike so much I'm buying my friend out of his half. He just found an awesome deal on a 1990 KX 250 so we'll have two four strokes and 2 two-strokes for everyone to ride. Thanks for the replys
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Old 01-12-2008, 11:44 PM
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Default Re: Honda cr125 won't start

Just to wrap up this thread. I got the bike into a flooded state again when we went out to the trails today. I found that if I left the choke down. Screwed the idle all the way down. Kicked on the bike 4 or 5 times without rolling up on the throttle it would either start up, or begin to start up and I could then roll up on the throttle just a little bit and it would start up. Also I slowly got just about to two full turns on the air screw before I stopped fouling out plugs while trail riding.
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Old 01-13-2008, 05:49 PM
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Default Re: Honda cr125 won't start

Correction*** Just went and reread the bottle of pre-mix oil I used on this bike and realized I have been running 52/1. So I am going to switch to 32/1, which means I'll probably have to start all over on dialing in the air screw.

Last edited by Manther; 01-13-2008 at 05:53 PM. Reason: typo
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Old 01-14-2008, 06:18 PM
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Default Re: Honda cr125 won't start

i got to reading ur thread and my cr125 did the same thing if u dont have the right plug in the bike it will foul out all the time so try buying the right plug idk wat the right plug is so that could be right but idk i know i run a 9dollar plug in mine and it does great
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