solorider Posted November 8, 2004 Share Posted November 8, 2004 i have a 1989 dt125r which has a dep exhaust system,performance reeds ,working power valve and when it hits the powerband it goes very well,but when at very low revs it will not tickover and will die when opening the throttle,from about 3000rpm it is fine i stripped and cleaned the carb and found nothing amiss,in fact it was clean so it is not blocked jets ,the main jet is 210 ,when starting the bike does need choke ,but when it has been run for a couple of minutes it will start fine but you have to catch it on the throttle to get it to rev ps i cant give the bike max revs yet due to running in and the engine is turning freely any help would be appreciated Link to comment Share on other sites More sharing options...
mozzy Posted November 9, 2004 Share Posted November 9, 2004 grt rid of the electric powervalve it may be smoother but its also a pain in the arse they are also more fun without it ive had 3 dt125r,s and one had operational powervalve and was crap the other two were great fun just peg it fully open and piss your mates off Link to comment Share on other sites More sharing options...
solorider Posted November 28, 2004 Author Share Posted November 28, 2004 the powervalve is not the problem,the bike is a right bitch to start,even when it has been started it will only start on choke unless warmed up fully. if the revs drop below 2500 rpm it will die,seems to be running weak at low revs,today the bike wouldnt start even by bump starting,screwed out the idle mixture screw and it started on the kick start! rode it around the garage a couple of times and it died again,got it started by bump starting and it ran for a minuite then died. below 2500 it will not respond to the throttle and will not tickover Link to comment Share on other sites More sharing options...
mattpearson1987 Posted December 1, 2004 Share Posted December 1, 2004 Had a similar prob wit my dt, the petrol pipes wer blocked and not allowing enough petrol into the carb. cleaned them and it has been fine since. Link to comment Share on other sites More sharing options...
solorider Posted December 5, 2004 Author Share Posted December 5, 2004 fitted new pipe over a week ago with a genuine yamaha part,bike had originaly aclear plastic pipe which i chucked away,i made a piece of pipe up to get it going but no change,the last owner had the same problem :cry: Link to comment Share on other sites More sharing options...
liquidcooled Posted December 5, 2004 Share Posted December 5, 2004 did you check the pilot jet in it? could be bunged up! make sure its at the right setting also. standard setting for the air screw is 1 1/2 turns out. check the battery is charged and not defective. check the plug in it is ok and the correct one(even if if it looks ok they can be dud so try another out). check for any air leaks in the intake! check the air filter(it may be clogged up). float heights may be worth checking also :wink: a few things for you to try/check over. let us know how you get on. not really an expert on dt's but these are fairly general things Link to comment Share on other sites More sharing options...
lee the flea Posted October 25, 2005 Share Posted October 25, 2005 the powervalve is not the problem,the bike is a right bitch to start,even when it has been started it will only start on choke unless warmed up fully. if the revs drop below 2500 rpm it will die,seems to be running weak at low revs,today the bike wouldnt start even by bump starting,screwed out the idle mixture screw and it started on the kick start! rode it around the garage a couple of times and it died again,got it started by bump starting and it ran for a minuite then died. below 2500 it will not respond to the throttle and will not tickover hi mate i know your question was a long time ago but i am interested to find out if you solved the proble as my dt has the exact same problem thanks lee Link to comment Share on other sites More sharing options...
Leon Posted January 4, 2006 Share Posted January 4, 2006 Have the same Problem on my dt175mx... Link to comment Share on other sites More sharing options...
Moderator YamaHead Posted January 4, 2006 Moderator Share Posted January 4, 2006 Like LC said......the 1st thing that comes to mind is the pilot jet Definitely sounds like a carb related prob Link to comment Share on other sites More sharing options...
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