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Rm 250 Wont Run Longer Than 20 Seconds

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I Was Wondering If Anyone Would Know Why My Bike Would Not Run For More That 20 Seconds Or So I Cleaned The Carburator Put It Back On Still Does The Same Thing. It Started Right Up Ran For 20 Seconds And Then Killed I Couldn't Get It Started For Quite A While After That. Thats All I Know About It

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Mine did the same thing, its partially jetting, but most of my problem was my exhaust has a rubber spring gasket deal that seals between silencer and pipe. I forgot to put mine on so when i started it, it would run for a few seconds then die. I found the problem put the rubber deal back on and put a another plug in and it started right up and ran fine. Good luck! :thumbsup:

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