G1 Questions

[Trackside]

Hey guys,
I just recently purchased a G1 (Year unknown) But I believe it's a late 80's Early 90's model. 1 Cylinder 2 Stroke Model. It seems low on power. What can I do do help it out some besides the basic tune up & Muffler BBQ that I hear about? Also its seems to lag when I try to start it up. After I press the gas pedal down it takes a few seconds before she will start, this is the same for either forward or reverse. Your help would be greatly appreciated.

Do seals help that much in adding / restoring power? What else is recommended for alittle more umph besides all the basics?

I also just noticed that the linkage from the butteryfly in the exhaust to the side of the engine is missing? What is that valve for? and does wiring it open or removing the butterfly help with performance?

Also what Oil do you guys use or recommend? Does anyone here use redline 2 Stroke oils?