Aye pete" disconnect the Black/white from ignition and then try,,, pop up a piccy of DT,,, i have Cd manuals of the DT250F .
dont know if i scan load them ,,on here,,
Yeh " the pilot jet is blocked,, mine only needs choke for 10 seconds, definately wont run with choke on,,, yours is using the choke to suppliment the lack of fuel thu the pilot being blocked,
Salmon pinks" , And E"s [ exticee] are good,, i was working in nightclubs at the time. i remember all this,.. Skins were for roll up fags [ for hash] and wacky backy,
Plates my be contaminated with all the crap oils ,, giv it 1 more change .if still slipping then it a strip job,,, be interesting to see if this castrol is now gray,,,
Give it a good firm upshift from first, you"l just go to second , as 3rd cant be selected till you let shifter go, glad your enjoying it.. gets better in summer,