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1995 Yamaha Big Bear Rough Idle

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hey guys. new hear. i just got a 95 big bear that ran fine when i looked at it, but now when i startit, it idles real bad. it runs for a bit at a higher idle, then dies right down and then dies. fire it back up and turn the idle screw in and it idles high. will run fine for a bit then stutters and idles down almost dies then lights up again, then a second later, dies. ive cleaned the carb the best i can . blew out the passages and tried again. still does the same . the air screw was bottomed right down. i opened it to about 2 turns out. seemed to bring the idle back up, then stuters and back down till almost dead, then dies. any suggestions?

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