YamYamMan Posted June 22, 2013 Share Posted June 22, 2013 Hi guy's Never posted before but found a lot of useful advice on the forum. Anyway, I recently changed the main jet on my dt 125 (up from a 230 to a 250) now it just keeps flooding at idle, runs fine when being revved but every time it drops bellow about 2500rpm it just floods and cuts out. Does the main jet have any bearing on the idle? I personally didn't think it would as I thought the idle jet would take care of the idle, or am I just stupid lol Any help would be much appreciated Wade Link to comment Share on other sites More sharing options...
Ttaskmaster Posted June 22, 2013 Share Posted June 22, 2013 Might need to adjust the mixture screw as you're probably now getting more fuel, so need more air to compensate. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted June 22, 2013 Moderator Share Posted June 22, 2013 and/or try a bit less of a jump...ie a 240 jet Link to comment Share on other sites More sharing options...
YamYamMan Posted June 23, 2013 Author Share Posted June 23, 2013 I tried adjusting the mixture a little but didn't want to mess too much as I don't know which way to turn to make it more lean lol Link to comment Share on other sites More sharing options...
NEV Posted June 23, 2013 Share Posted June 23, 2013 Mixture screw should be around 1 1/2 turns out from fully in, to richen up turn right or clock wise, to lean off turn anti clockwise or left, so that's right = rich, left =lean. Link to comment Share on other sites More sharing options...
YamYamMan Posted June 23, 2013 Author Share Posted June 23, 2013 Thanks Nev, just adjusted the mixture screw and it was set about 2 1/4 turns out so I brought it out 1 1/2 as u said and it ran way better so I took it for a run and it still kept trying to die, then I turned it back in 1/4 of a turn and it seems nice now, just gotta check the plug colour. Thanks again Link to comment Share on other sites More sharing options...
NEV Posted June 23, 2013 Share Posted June 23, 2013 Remember too that you can raise or lower the needle to make it richer or leaner, plus check your air filter make sure its clean,, and has been primed with oil, I personally use 2t oil to prime mine. btw it shouldn't be wringing wet with oil, just moist. Link to comment Share on other sites More sharing options...
YamYamMan Posted June 23, 2013 Author Share Posted June 23, 2013 Its running sweet as a nut now, thanks for the help, plugs a nice chocolatey brown and air filters only a couple of months old, I used castrol air filter oil on it (the really sticky stuff) and its still like brand new Link to comment Share on other sites More sharing options...
NEV Posted June 23, 2013 Share Posted June 23, 2013 Sorted then, nice one Link to comment Share on other sites More sharing options...
YamYamMan Posted June 23, 2013 Author Share Posted June 23, 2013 Cheers mate, your a star Link to comment Share on other sites More sharing options...
blackhat250 Posted June 23, 2013 Share Posted June 23, 2013 Good you"v got sorted, the main jet has no bearing on low engine speed. only wide open throttle. pilot jet & air screw determine idle and first 1/4 of throttle opening,, Link to comment Share on other sites More sharing options...
mike1949 Posted June 23, 2013 Share Posted June 23, 2013 Cheers mate, your a star That's what this forum is all about YYM. See we don't even discriminate against the black country. No doubt I will get a few comments about that remark. Link to comment Share on other sites More sharing options...
YamYamMan Posted June 23, 2013 Author Share Posted June 23, 2013 That's what I thought to be honest blackhat but I've never had to touch a mixture screw before so hadn't got a clue what to do with it lol I quite liked the Black Country comment Mark but I could see others taking it the wrong way...........oh we'll you can't please them all lol Link to comment Share on other sites More sharing options...
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