125-200cc 2012 cr144 Please help

Hello everyone, my name is Wes and I have a 2012 cr144. I traded my junky 450 to this bike and need some help. I have ridden this bike maybe a total of one mile very hard and I have noticed that there is an excessive amount of oil coming out of the silencer. The bike seems to run great compared to all the other Honda 125s I've owned. The bike had a br9es plug in it and has an fmf fatty/turbinecore 2. Previous owner said he mixes 40:1. He didn't say what oil he uses. I pulled the plug and and looked fine nice tan color to it. I was just wandering if this would bother anything as the bike seems to run great I won't be racing just some trail riding and hill climbing for me. Oh and one more thing, I noticed that the transmission oil level was low. Like so low that it wasn't in the sight glass and when I asked the guy he said he used the recommended amount but it wouldn't show in the glass. You guys have this problem too? Or have I been had? Thanks for any replies. I really appreciate/need the help.

Change the gearbox oil and set the level in the centre of the sight glass, then monitor the level. It should not change.
Oil spooge from the muffler may not be an issue. If it's running well and the plug is a good colour I'd leave it. The excess spooge will likely be leftover oil in the muffler from the previous owners riding, possibly riding at low revs for extended periods. Might pay to repackage the muffler.
Use a good quality synthetic 2t oil at a ratio between 32 & 40 to 1 and you should be fine.

Do wat this guy^ said!

Thanks guys. I really appreciate the advice. I rode it again today and I've been a Honda guy all my life but I believe it's safe to say that these little huskies are the shit. I don't care if I ever ride anything else again. Lol