2smokewilleh

Hey guys, Few months back I picked up a (I think 75ish) Yamaha DT250, pretty rough, but only $200. Looks like it has had the crap butchered out of it. No electrics left, no injector oil tank, but, it had compression and was otherwise mostly complete. Someone had put on a plastic gas tank. Cleaned it up a bit, made up some pre-mix (About 35:1). Didn't have any spark. Pulled off the flywheel and found some mud stuck between the points. They're pretty pitted/worn, I will replace them, but in the mean time, cleaned them up, pulled the plug and grounded it, and ended up with ok spark. ANyways, long story short got it running, it will rev up and will get through the gears ok, gear box feels strong, but it keeps fouling up the plugs and, it will only run with the choke on (Even when hot). If i take the choke off, it dies in a few seconds.... it otherwise runs pretty well when the choke is on, but smokes pretty heavily. (Doesnt seem to be leaking through the crankcase seal). Otherwise, bike is pretty solid. the front fork dust boots are missing and the fork oil seals need replacing. Fortunately you can still get those parts at the local yamaha dealer! So I have a feq questions: 1) For pre-mix, what Gas/Oil ratio to use? I highly doubt that i would ever get the oil injection system functioning properly, so pre-mix it will be... 2) What is the correct spark plug to use for this bike, and correct gap? 3) Carbs are my weakness - What can be done about it only wanting to run while the choke is on? 4) How much fork oil does it take? (before i drop out the forks and change the seals). Any help is appreciated! Thanks much,