2004 Xr400

I found an XR400 yestarday after looking for a while...this one had rolled over the tripmeter 1 time and shows 28, for a grand total 128 miles. Exactly the bone stock unmolested bike I've been waiting for. I've read a lot of jetting posts, but most are in combination with some other mods. In my case, the bike has very old gas, so I took the carb out and cleaned it, and added fresh gas. Found the mixture screw to be 4 turns out and a jet black plug covered in soot. Also found the little white plastic "plate" that slips up over the main jet was installed upside down. After this, the bike seems to run great, but I need to let it get cold to see if it starts any better (I'm familiar with starting XR's, this one just liked to sputter and die when I got it).

The stock jetting is 142 main and 52 pilot. My question is...with no other changes from stock are these the jets to keep or is there a better setup?I'm in the Chicago area at about 600 ft ASL....so no altitude issues to deal with.

Update....I let the bike get nice and cold, and it starts much easier. I need to ride it a little, as I'm not convinced this thing is even broken in at 128 miles, but it does like to sputter a little and will die when cold without feathering the throttle. The midpoint setting on the choke doesn't seem to have any effect regardless if the bike is hot or cold. Does this tell anybody anything?

XR400 starting

Thanks. The bike starts very easily when warm, and I've had the carb apart and know everything is clean. It also starts easily when cold, but it's taking several attempts. It will start right away on full choke, and idle very slowly...any throttle will kill it. Moving the choke to the center it will idle for 10 seconds or so, and again any throttle will kill it. After repeating this a few times, I'm finally able to use the throttle and get the revs up to get it warm. Once warm the idle is perfect. I have the pilot screw set at about 2.5 turns...maybe I need to go a little more and raise the idle a little so when it starts cold it will stay running. The pilot screw was about 4 turns out when I got the bike, but the plug was filthy and jet black. Any help or advice would be appreciated.