@Calum hi calum tried it with pv unplugged and it has no power plugged it back in and ther is plenty of mid range power good throttle response just when the valve is open it screams but not going anywere seems like carb problem but only started since cdi change the bikes got a old round slide carb on it with a 145 main jet and ran quite well before cdi change i tried a 180 jet but just spluttered and valve wouldnt open i do have a 160 i could try?

Ye power valve is working as it should cleaned carb changed spark plug cut a bit off the ht lead and put cap back on

My dtr died on me on the way home from work it stopped sparking turned out to b cdi so got one off my bros bike which was running fine now its working but its very flat ant mid to high end revs and when i rev in not under load it misses at about 9k?? Any ideas would be great thanks

Hi wondering if someone has had the same problem and fixed it on my dt125r 1998 when i turn ignition on the pv servo cleans itself but when the bike is running the servo doesnt move i have a new battery on there so its not that any ideas would be great. Thank you