I just replaced my carbs (a 49 state version with a CA version in case that is relevant), and the good dews is that the engine runs and holds idle.  The bad news is that when I rev it the bike a) holds the revs abnormally long and lowers them too slow and b) seems to take a split second too long to rev up when I turn the throttle.  Does anyone know what may cause this?

first guess is you have a vacuum leak....   check the carb boots and vacuum lines to see if something isn't mated up right

here's a couple of topics that deal with similar woes.....


http://www.gstwins.com/forum/viewtopic.php?t=5354&highlight=slow+return+idle&sid=92d6c8584a492d6c0a2090acfa1c6ecd

http://www.gstwins.com/forum/viewtopic.php?t=7584&highlight=slow+return+idle&sid=92d6c8584a492d6c0a2090acfa1c6ec

It seems the carburetion is still too lean. Did you drill out the mixture screw caps and set the screws to 3 turns out? Did you change out the pilot jets for size 40 non-bleeder type pilot jets?

Quote from: scratchIt seems the carburetion is still too lean. Did you drill out the mixture screw caps and put the screws out 3 turns? Did you change out the pilot jets for size 40 non-bleeder type pilot jets?

All the jets are from my old carbs - the ones left in there were  clogged and the slots were so stripped that I couldn't put them back in (I barely got them out).I didn't drill out the mixture screw caps.  Are there screws under them or do have to take the screws from my old one and do anything special to put them in?

Thanks everyone!  I think it is good to go.  Anyone up for an early morning ride tomorrow?  I'm talking dawn, now.  Cancel your cow milking appointments.

I'm glad you got the bike to run again!

Quote from: conflicttheoristthe [jets] left in there were clogged and the slots were so stripped that I couldn't put them back in (I barely got them out).

The threads were stripped?!

Quote from: conflicttheoristAre there screws under them or do have to take the screws from my old one and do anything special to put them in?

Yes, the screws are underneath, you will only need to remove the brass covers so you can adjust the screws to 3 turns out.