Anthony graham

Hi everyone.I've got an intermittent fault on my 05 dt,one minute it goes like stink then it seems to go into a limp mode if I pull the throttle past 2000rpm it just completely dies nearly cuts out .I've checked and changed the plug,nice tan colour emptied the float no water or crap in it took the snorkel off the airbox no difference.it went fantastic a few weeks ago then I put a brand new dep can on it and it started playing up.its now with a bike mechanic,spoke to him today and he says he's stripped the carb it's not that,checked the ht lead not that,checked the piston not that.now he says I owe them 4hrs labour and that he doesn't know whats wrong with it, his advice is to start changing things,coil,cdi unit till we find what's wrong with it.surely there's a more scientific way than this. Feel I'm being ripped off!please help.

Hi everyone,got a problem with my dt 125re,rear brake light works but taillight doesn't I've tried new bulbs but still won't work.any ideas.