So I have three of these, one is all stock and runs perfect. The other two kinda have the same problem. Used factory oil injection and both smoke a lot. Took one of them and just ran a good premix and skipped the oil injection. Still smokes like crazy so then I noticed oil spraying from the exhaust. I’m assuming it’s coming from the crankcase oil? So what are my problems. They both start and the one starts on first kick every time so I’m pretty sure the compression is good. Thanks.