aero nut

Jose! do not use automobile oil(4 stroke) because it can damage your engine, this oil contains additives that can attack the aluminum of our 2 stroke engines, besides the low rpms you are getting is due to the fact that motor oil does't burn as clean as 2 stroke engine oils these are ashless and burn cleaner without robbing engine performance, use this oil in a 32:1 ratio and it should give very good protection against lean runs, try it and see the improvements in your numbers, also it would help if you can eliminate some of the inside dampers of your muffler, take the screen off the muffler exit and make a 1/2 inch hole that runs through the inside of the muffler, I did that to mine and it helped alot.