So I've got a stock 1981 XS400, stock carbs (running cylinder air filters). My bike idles well once its warmed up, but it behaves very strangely sometimes. Once idling well, if I give it gas, the idle jumps up to about 3-4000RPM and stays there, and eventually returns after a few seconds. I figured this meant that the main jet might be too big.
However, if I run the bike with the choke on, it runs perfectly. throttle response is great, and it idles well. I figured this meant that the bike was running lean, and cutting off the air was making it behave correctly.
Does anybody have any suggestions about what to do in this situation? I'm lost
However, if I run the bike with the choke on, it runs perfectly. throttle response is great, and it idles well. I figured this meant that the bike was running lean, and cutting off the air was making it behave correctly.
Does anybody have any suggestions about what to do in this situation? I'm lost