Join Date: Sep 2020
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2004 Big Bear 400 idles great, but have to choke it to go.
I have a 2004 yamaha big bear 400. It cranks and idles smoothly, but will not run at higher speeds without the choke on. I replaced the carburator, fuel line, fuel shut off valve in tank with new filters. New air filter, spark plugs verified valve lash is within specs. No air leaks between carb and engine (tested by spraying ether all around throat between carb and cylinder head). I am stumped. Can anybody help please? Thanks in advance.