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1990 cr125 wont run, need help

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I have this cr125 that this guy wanted me to fix and he would pay me, long story short i rebuilt the top end, new air filter, and cleaned the carb out, and oil change. Did all the correct steps before starting it and it was running great and would start first kick. Then one day riding it for awhile it just died out on me like there was no gas. Just tried and new spark plug but it will only start upon roll starting it and runs like crap.

what do you think happen to it? What should i do? thanks

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Check the reeds. If they aren't laying perfectly flat and flush against the reed cage, or if there is any broken pieces they need to be replaced. They help with compression. Another thing to check is the stator and pulsar timing and resistance. Those specs should be in any version of the manual.

good luck.

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