gght Posted December 20, 2014 Share Posted December 20, 2014 hi all, my dt250 only fires for about 2 seconds and cuts out sometimes back fires when kicked tries to start plug is wet any ideas are welcome Link to comment Share on other sites More sharing options...
blackhat250 Posted December 20, 2014 Share Posted December 20, 2014 If plug is wet , its getting fuel,, but" how old is the fuel ? and renew spark plug,,,and see what happens Link to comment Share on other sites More sharing options...
Moderator Airhead Posted December 20, 2014 Moderator Share Posted December 20, 2014 so tell us some history, what have you done recently...did is run ok yesterday...what did you do since???? Link to comment Share on other sites More sharing options...
gght Posted December 21, 2014 Author Share Posted December 21, 2014 year of bike is 1982 fuel is new so is plug and cap not had it running for about 18 months engine been out carb off frame powder coated I am thinking it might be reeds had a look at them and there is gaps in them kicked over with carb off/plug out and can see fuel coming back from the reeds this is my first project and not really used a forum before hoping to start a collection of dt's thanks for reply Link to comment Share on other sites More sharing options...
blackhat250 Posted December 21, 2014 Share Posted December 21, 2014 Reeds are for better midrange power, and blow back,,, should not affect starting,, [ as a piston port engine has no reeds] , Back fire is fuel in exhaust igniting, does it run on choke? then die when off choke, Link to comment Share on other sites More sharing options...
gght Posted December 21, 2014 Author Share Posted December 21, 2014 it fires for about 2 secs on choke as if it wants to start with no choke, throttle needs to be open about a quart still about 2 secs yes there is a lot of fuel in the exhaust Link to comment Share on other sites More sharing options...
blackhat250 Posted December 21, 2014 Share Posted December 21, 2014 Take out plug , leave over night, clean plug and try to start without choke,, just to see,, is there a good spark,, Link to comment Share on other sites More sharing options...
gght Posted December 26, 2014 Author Share Posted December 26, 2014 yes there is a good spark it started and revved twice and then cut out could it have anything to do with the electrics as I have only put in together temporary Link to comment Share on other sites More sharing options...
blackhat250 Posted December 26, 2014 Share Posted December 26, 2014 , Am shure its carburettor probs here, , The pilot jet must be choked,, is there an air filter on bike,,? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted December 26, 2014 Moderator Share Posted December 26, 2014 yeah sure it could easily have to do with the electrics, but with this problem a new plug is always the first port of call Link to comment Share on other sites More sharing options...
gght Posted December 26, 2014 Author Share Posted December 26, 2014 yes there is a air filter but not had the rubber boot joint on so back of carb is open it has a new plug and cap with the new plug this is when it revved twice and died Link to comment Share on other sites More sharing options...
Moderator Airhead Posted December 26, 2014 Moderator Share Posted December 26, 2014 it needs the air filter coupled up correctly 1 Link to comment Share on other sites More sharing options...
blackhat250 Posted December 26, 2014 Share Posted December 26, 2014 yes there is a air filter but not had the rubber boot joint on so back of carb is open Aha" do you not have the rubber connector, ? if you don't, and want to run it, tape off 3/4 of the carb orifice , with gaffer tape [ super tape] not thin stuff or it will suck it in,,,she should run,, Link to comment Share on other sites More sharing options...
gght Posted January 6, 2015 Author Share Posted January 6, 2015 right all is put back correctly left to stand over crimo tried last night to start again started for 2 secs and cut out have noticed that the air screw on carb is all the way in ??? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted January 6, 2015 Moderator Share Posted January 6, 2015 often they are set around 1 1/2 turns out, try that Link to comment Share on other sites More sharing options...
gght Posted January 6, 2015 Author Share Posted January 6, 2015 thanks will try would the idle screw have anything to do with it Link to comment Share on other sites More sharing options...
Moderator Airhead Posted January 6, 2015 Moderator Share Posted January 6, 2015 if you can keep it going by 'feathering' the throttle, then yes the idle screw needs turning inwards a little Link to comment Share on other sites More sharing options...
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