Hi, I ordered an all balls carb kit and a diaphragm for the accelerator pump from the marvellous Totally TTR's. My carb was dripping because some idiot( me ) put BP ultimate in it because the garage had just changed to E10 , So the rub is it was ultimate diesel So I stripped carb and replaced parts except for the needle and main jet. The kit had a 137 main and my carb has a 150. the pilot jet was 47 and I changed that for the kit 50. The ttr is back together and feels like it's more responsive and none the worse for its wrong fuel episode. I just wondered if the 150 jet was an upgrade by a previous owner
It's easily done! Where was the drip from? Did the diesel attack the float bowl o ring?
If you have a free flowing exhaust and/or airbox intake mods, the bigger main jet would be there to avoid lean running at higher revs.
So I stripped carb and replaced parts except for the needle and main jet. The kit had a 137 main and my carb has a 150. the pilot jet was 47 and I changed that for the kit 50. The ttr is back together and feels like it's more responsive and none the worse for its wrong fuel episode. I just wondered if the 150 jet was an upgrade by a previous owner 
