Tear it down now man. All of these older riders are correct. A new gasket kit, piston and rings might be $160. If you want to really do it right find a good machine shop and have it bored to mach the new piston and ring. Then you will have all new surfaces. When I was a kid I blew up a couple bike riding them with low compression. I more than doubles the price if you were to just do it right the first time. A two stroke can run on low compression but its far from made to. It puts stress on everything and if something lets go up top it will probably wipe out anything good you have in the bottom.