Replacement throttle cable arrived and fitted perfectly, then realised had left the little rubber boot off the carb end, balls, refitted cable and then popped the carb and boost bottle back on. Filled fluids and bled oil pump, kicked over a few times with ignition off, fuel on (inline filter), choke on, 3rd kick a splitter and then away it went. Running a lot healthier than before and pick up off the throttle is nice and crisp if you know what I mean. Let it warm up and thermostat working fine, well pleased. I thought if anything was going to be a problem it would be the carb but that seems sweet thank God, the truth will be when I ride it though. Wheels due back in a fortnight so 2 weeks to rebuild the master cylinders and calipers, still hoping for a reply from Yamaha about the original build colour though. Going to get original expansion chamber refinished before fitting it back on, currently has B.O expansion camber and tail pipe but diameter of tail pipe smaller than expansion pipe, will have to source an original silencer soon.
@vtrn_raptor It's an indicator relay I believe, if you type the part number into the search box on Fowlers webby, it will tell you which bikes use that part. Just scroll down to find the year of your DTR;
my rs use to eat plugs at first like that bad I carried a few and the tools every where I went I mean I would still carry plugs anyway with a 2 stroke but the point is it was because of too much oil and it would be a pain every time you was in a hurry and ran like shit after a few rides if I was you I would pick one or the other you're gonna have a bad time in the rain at the side of the road a few times if not
@runes Sounds to me that the mixer screw is the problem, as the mixture is wrong. It's either rusted or been abused and consequently the engines fuel/air mixture is wrong. If the plug is getting wet, surely that's from over fueling and the engine running too rich? Which would cause the starting problem you are experiencing.
I would get a new mixer screw fitted before doing anything else, so that you can adjust the mixture correctly and hopefully that should solve your problem. Then that way you will know for-sure if the engine's mix is correct and eliminate that from your suspected fault list before throwing a ton of cash on it. What RPM does the bike idle at???