Update/Problem Resolved: I re-positioned the sliding brass choke mechanism that attaches to the carbs and the choke works fine now. The problem was that I had moved the sliding mechanism when I took the carbs apart and reattached it so that there was not maximal movement allowed at the carb end. Thus the choke was not moving the plunger out enough (i.e. away from the carb body) when I moved the choke lever.
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I have a 2006 GS500F and took the carbs apart a few weeks ago for cleaning and rejetting. I got them put back together and the bike runs great for the most part, however the choke does not work now. There is no increase in rpm when using the choke. The bike will however start without the choke (probably due to the rejet and warm weather).
When I pull the choke lever on the handlebar, I can see the end of the choke cable that is attached to the carb move (i.e. it slides the choke mechanism attached to the carbs, as is normal). However there is no increase in rpm while the choke is engaged. I have also played with the choke cable adjustment at the handlebar end, but this doesn't change anything either.
I would think that I must have messed something up within the choke mechanism of the carbs, however the choke actually did operate normally for a few days immediately after I put the carbs back together. It only started not working a few days later.
Any ideas what could be causing this problem? I did adjust the pilot screw when cleaning the carbs (they were turned out 6 turns, I adjusted them to 3 turns out)...but that shouldn't affect the choke circuit, right?