Troy,

I apologize for my ignorance on this YS engine. I guess I assumed that you were the resident expert here as you sign your posts with your name and Team YS Performance (This implies either Employee or Sponsored by to me anyway). I do want to thank you for your advice here, I just can't help feeling stupid that I didn't have the "common sense" to pre lubricate. I have had a few 2 stroke engines and this is my first 4 stroke. I know that with a 2 stroke, it is getting lubricated with the first amounts of fuel that travel through it. Where this 4 Stroke has no specific "oil" reservoir or pan I figured it was internally lubricated with the 20% oil mix in the fuel. I have learned the lesson that maybe one should scour the forums first on any new technology and find out how it is done rather than just jump into the manufacturers instructions.

I plan on trying to find a 0W or 5W Mobil 1 synthetic oil to use as has been stated in other posts. Is this the correct oil to use? As I remove covers on this motor to lubricate, is there any torque specs that I should know during the reassembly? If screw torque is not critical then I will plan on using some blue loctight and snugging them up. Also, do you know of any websights that will allow me to learn more of the in depth details of 4 stroke engines as they pertain to model aircraft. My ignorance on this stuff is my own fault and I want to remedy this.

Thanks Troy and everyone else for the info you have given thus far!

Shaun