I made a mistake in an earlier post when I said that a 280 main jet is too lean.  I thought that you had a LT 500.

Hahaha, good cause I thought you were crazy when I read that! 

37.5 pilot 240 main and needle in 3 rd clip. Stock. I ran on fmf boyesen rad  kn filter head shaved 195 main 35 pilot needle 4th clip. 210 main 40 pilot  needle 4 th clip in winter.

When you say 4th clip do you mean the 4th clip going down on the needle? I have mine in the middle right now so the 3rd.

Appears to be a stock carb. Like the looks of that intake too,,,, If you can, take and cut the threads away from the spark plug so you can see down to the bottom of the insulator in the pics please good sir.

I can try but I would have to use a hacksaw and i'm not sure how much of a pain this would be. Does it look a little on the lean side?