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I started servicing a friend of mines big bear, it did not run, I drained fuel from petcock, removed cleaned and put a carb kit in carburetor, pulled and cleaned spark plug, now it runs and idles fine, will take half and full throttle when not in gear but as soon as he takes it for a test for a test drive it sputters when he accelerates, I have no clue what maintenance has been done, is this a valve adjustment, timing? Any help is greatly appreciated, I know he does not want to sink a bunch of money in this, if it’s something simple I can look at please respond, thank you all in advance
 
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