January 13, 201115 yr I just finished with the top and bottom end rebuild on my 04 125 and the bike runs good (keep in mind I purchased it with a seized up motor so I can't comment on the before performance). The one issue that I am having is that it does not want to idle well. If you turn the idle screw in it speeds up the rpms but is very slow at coming down in rpms once the throttle is chopped/ closed. Any direction of where start? I assume it could be an air leak but have not started to track it down yet. There was a post in the Sherco forum a month ago that gave some tips for trouble shooting this symptom but I cannot find it. Thanks in advance.
January 13, 201115 yr Most common thing would be dirt in the jets. Recommend breaking the carb over a clear glass catch bowl to see what comes out. Pull the jets and note the sizes, and find a fine wire to pass throught the idle jet. flush well and blow out all passeges, including small ones in the bore behind slide. Clean filter behind fuel inlet banjo bolt.
January 14, 201115 yr Author Most common thing would be dirt in the jets. Recommend breaking the carb over a clear glass catch bowl to see what comes out. Pull the jets and note the sizes, and find a fine wire to pass throught the idle jet. flush well and blow out all passeges, including small ones in the bore behind slide. Clean filter behind fuel inlet banjo bolt. Since you have had this bike should it idle fairly well without having to keep opening and closing the throttle? I pulled the carb apart during the rebuild and will do it again this weekend to see if there is some residual particles in there. By the way the head you sent me machined/cleaned up really well. I only had to take about 12 thousandts off but did not need to use as I corrected the issues with the S3 Star head. Thanks again.
January 14, 201115 yr If all is good with the carb your fuel screw may be too far in. The bike should idle nice. On our '08 we ran 38 pilot & 110 main with the fuel screw 3-4 turns out.
January 15, 201115 yr Yea, as Chris said, they should idle sweet is all is good. Wit the bike been kinda sitting up for a while, you really got to watch out for water dropout of the fuel or condensation as well as particulates. Insure tank and fuel supply can are clean. The banjo screens seem adiquate, and if you have long tubes installed on the bowl vents, these should be removed. Many run without them, but I always run a short hose about 1.5 inches as a crap deflector. Once right, the stock dellorto is a pretty stable and forgiving carb, though. Hopefully there is nothing else wierd going on.
January 17, 201115 yr Author Yea, as Chris said, they should idle sweet is all is good. Wit the bike been kinda sitting up for a while, you really got to watch out for water dropout of the fuel or condensation as well as particulates. Insure tank and fuel supply can are clean. The banjo screens seem adiquate, and if you have long tubes installed on the bowl vents, these should be removed. Many run without them, but I always run a short hose about 1.5 inches as a crap deflector. Once right, the stock dellorto is a pretty stable and forgiving carb, though. Hopefully there is nothing else wierd going on. Update: I pulled the carb back apart and cleaned everything out with contact cleaner and compressed air. She idles very well now! Thanks Copemech and Chris. I also took note of the following: Main= 122 Pilot= 36 Choke= 60 Atomizer= 270K Slide= 60 Needle= D36 Air Screw out 1.75 turns Idle out 2.5 turns Needle clip is 3rd from top Thanks again for the help. Now on to to replacing the water pump seals, chain slide, tensioner block.
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