hi everyone , i just got a 2007 s40 with 4100 miles on it the other day. it run good when i look it over  and drove it . i drove it today about 25 miles and it ran good , i put gas in it with some seafoam . when i got home i change the oil and filter . when i started it up to get the new oil flowing, it wont idle right now, i turn the idle screw in all the way , and when i start the bike it wont idle right and stalls out with the idle screw screwed in or out . if i hold the throttle open it will run but rough .

i read about vacume test and just did it and it still wont idle and it still stalls out . i unhook the gas line and put petcock on prime and gas came right out and then i put it back to on with the gas line still off and started the bike and gas came right out like prime . do you think the seafoam did something

i dont think its the petcock gas is coming out . please read all my post . ii drain oil from the under the motor in the front where the drain plug is and i put in 20/50 reg. oil and 2.1 qt . i put the seafoam in because the bike has been sitting for awhile and i didnt know how old the gas was from the owner i brought from .

thanks and yes i read both . i own another s40 3 years ago , well my wife drove it . after that one she moved up to a sportster 883 but she never felt comfortable  on the 883 so we just sold it and got this s40 the other day . i pull off the gas tank yesterday and pulled the spark plug . the plug looked good but i put the new  one in and it still ran the same . i even left the plug out up against the motor and started the bike to make sure there was study spark coming out of the plug .  i think the carb needs cleaning . when i start the bike and hold the throttle open it will run rough and i let it run a few moments and i can smell gas like the all the gas is not getting burned . i got a carb rebuild kit coming today and i`m going to pull it off friday and clean it , hopeful it will solve the problem . the bike is 17 years old with 4100 miles , thats only about 6 miles aweek , so to me its a good chance the carb needs to be cleaned

i took the carb apart today and it was not to bad , the pilot jet was really dirty , alot of black stuff came out when i shot carb cleaner in it .( it idles right now ) the DIAPHRAGM would not slide , if i pushed it up it would stay up and not slide back down so i polish it and now it slides good , i took out the needle and it was missing the spring . the only problem now is it hastate at mid throttle . does anyone if thats a jet ?