engine stalls when Choke is fully open

80 Yamaha XS 400 discussion forum:


engine stalls when Choke is fully open

engine stalls when Choke is fully open 
combatbootboy said 2010-04-20 19:29 
 
Hey folks, got an xs400sg a few days ago and I noticed that when the choke is fully pulled out that the engine sputters then dies. When the choke is only 1/2 pulled I can start and let the engine warm up and idle. The bike seems to idle ok, once warmed up.

I was under the impression that the bike should run without problem if the choke is fully open... Any idea what that means? Gummed up carbs or spark plug maybe? 
 
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