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need help with a 1997 cr 125 wont stay running

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hello i gota gently used 1997 cr 125 for a good deal iv road it around for about one month now and love it i put 25 hours on this bike and everything was checked before i got it and it all checked out but the issue i and having now is when i start the bike and let it warm up it runs about 2- 3 mins then stalls wether u idle it or give it a little bit of throttle. Then it wont start no matter how many time u kick it over but if u pull the plug and clean the gas of, it will fire again but stall. Every time i do this it idles for less time im to the point where it fires up then dies right away i have cleaned and oiled the air filter and it cant be a jetting problem or it wouldent of ran before???? i  run the bike 35/1 for gas to oil is this a top end issue???? new rings????? i dont have a compression tester and was wondering if anyone could help me with this issue any advice would be helpful seems how this is my first 2 stroke. thanks in advance

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Sounds like it is fouling plugs.  What is your current jetting including the air screw setting?  It is better to put in a new plug rather than try and clean it.  Are you losing any trans fluid?  Maybe a possible right hand crank seal.

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Probably the top end. It's a 97 and you put 25 hours on it. I'd definitely would and just replace the plug too. Some people say to do the top end on a 125 like every 15 hours some say they can easily get 50 plus. Unless you're really beating the Crap out of it then yeah 10 to 15 is right. I am fairly aggressive and easily put 25 my last piston and I REALLY should have had the cylinder replated. I didn't know at the time what it was supposed to look like. So I'd say 25 to maybe 35 on a good coated piston, good cylinder and crank; anything else and I think it's just luck to get that much time on a high performance machine that was meant to be worked on fairly frequently(some may disagree). Seems like a lot of the people that say more also rebuild there whole motor when the piston breaks apart. That's just my opinion though I'd like to see others too haha

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I'd also check the trans airline hose for bubbles, now that I'm thinking and it is a 97 it might be best just do the top and bottom end. I know it sucks but a lot of times with used bikes they just aren't taken care of at all... Even if they look pretty

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