thomastomsk Posted October 1, 2009 Report Share Posted October 1, 2009 (edited) my sy 250 starts second kick,no problems,but sometimes after a while it cuts out ,then starts first time and after awhile same again and so on,i have cleaned the tank freesh fuel,my mixture is 70ml to 5ltr,and the mixer screw on the carb is set at two and harf turns out from fully in, and i fitted a new spark plug and air filter ,anybody got any ideas.thanks tom Edited October 1, 2009 by thomastomsk Quote Link to comment Share on other sites More sharing options...
big john Posted October 1, 2009 Report Share Posted October 1, 2009 Make sure its getting air into the fuel tank via the overflow pipe, we had one which had a blocked/faulty breather pipe on the tank cap. Also what about if you have an in-line fule filter is it clear? Big John Quote Link to comment Share on other sites More sharing options...
montman Posted October 1, 2009 Report Share Posted October 1, 2009 Have you thoroughly cleaned through the Carb? Quote Link to comment Share on other sites More sharing options...
the addict Posted October 1, 2009 Report Share Posted October 1, 2009 As John says, sounds like a blocked fuel tank breather Quote Link to comment Share on other sites More sharing options...
thomastomsk Posted October 2, 2009 Author Report Share Posted October 2, 2009 the tank breather is fine, next step is to strip and clean the carb ,any pointers before i start,thanks tom Quote Link to comment Share on other sites More sharing options...
nottoogood Posted October 3, 2009 Report Share Posted October 3, 2009 here's how I did it...in order i think. Remove: 1. fender 2. tank 3. sub frame 4. airbox 5. muffler 6. expansion chamber 7. header Seems a bit much...but its tight in there. Remeber to take pics as i had to remove some of the electrics and master cyclinder....and had to fiddle to get it all right. Quote Link to comment Share on other sites More sharing options...
jmspear Posted October 4, 2009 Report Share Posted October 4, 2009 Bit left field but I had the same problem on my 04 SY 250 and stripped the carb etc, etc (and it was a bugger as really tight in there) and after all this it was my spark plug cap! When I replaced the cap all was fine. What had happened was that with the tight space up under the tank, the cap regularly get covered in mud and crap which doesn't get removed unless you take tank off when cleaning the bike (as you can't get at the plug cap) this then causes shorting which knackers the cap. I also removed the outer HT sleeve as this was also full of crap inbetween the sleeve and the HT lead. Worth a try. Good luck Quote Link to comment Share on other sites More sharing options...
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