Running rough

[steitsma]

I'm new to the site fo forgive me if this has been tackeld before.  I have a 1992 GS500 that I bought last June with 9900 miles on it for $400.  It had been sitting forever so my brother and I went over it, cleaned the carbs and got it running great.  I ran it empty over the winter to re-paint and had it back together for the last 3 weeks.  It started right up and was running great again, then yesterday i started it and it was revving high then dropping down, I would turn the idle screw so much and nothing was changing.  Went like this for like 15 min. trying to figure it out, i finally turned the idle screw enough to adjust it, it was like i had it turned all the way down from the previous ride.  there isn't much hesitation when i roll on the trottle but when i back off to crusie with it i feel it pulling the dying then pulling and dying again.  when i roll on the trottle it pulls strong.  do i need to clean the carbs again??  unless my 4 yr old daughter was playing and turning the idle screw when i wasn't home i don't understand why the week before it was set at 1200rpm and yesterday feel like it was turned all the way down.  any feedback will be greatly appreciated, thanks for reading!!!

[tt_four]

Air leak? that's not a real assessment. That's my guess. I'm gonna wait for some of the more knowledgeable people to come by and see if I was anywhere near correct.

[Toledo Jim]

Try running some SeaFoam through it.

[gregvhen]

Air leak? that's not a real assessment. That's my guess. I'm gonna wait for some of the more knowledgeable people to come by and see if I was anywhere near correct.

+1. with it running, spray WD-40 around the intake boots. if the rpms change when you hit it with WD-40, your boots are leaking, and you are very happy because you just found the problem, and its a cheap fix. but chances are im wrong and some one smarter than me will tell you whats really up.