Box Case

I'm new on here. I just got a 87 trx250x from a buddy in a box. the lower timing gear needed replaced. I did that (I hope I put it on straight). had the head honed replaced the rings and set the timing.

when I was setting the timing I couldn't get it perfect its about 1/2 tooth off.

when I was putting the bearings on the cam they slid on real easy.

Ive cleaned the carb 3 times and the tank filter and petcock once.

no decompression cable. and the rubber seal on the head gone. I replaced with a plastic plug for a garden pot and put silicone with it.

I also didn't know there was a special oil for motorcycles and put in regular penziol 10w-40.

My problem is Ive had it going and rode it. Rode about 2 blocks and back ran great. when I pulled in the drive I tried to give a little and the clutch slipped. so I turned my wheels straight and tried again( I thought maybe a cable from tuning and it did it again.) So I parked it and right before I turned it off the the plastic plug popped out and I got blue smoke( I'm not sure from the cam bearing hole or from oil hitting the muffler)

So I took the drain plug out and let the oil drip all night. I pu in the GN4 today and tried starting with another homemade seal and it will not start. spark good, comprssion good, getting gas.

Any help would be appreciated. I could go on and on.