I too agree with getting the motor pinch. It will not last as long as a new piston and sleeve, but well worth the money if your motor is not going out in other places.
How are all the seals ? Leaking air ?
Bearings ?
Is the creank showing wear ?
And how about everything else ?
But I believe you are starting in the wrong direction. Joe is right. Price is not what your looking for. Find someone with alot of positive feedback. There are many good places out there. I have used rayaracing and was very pleased. Do a bit of research first. Why try to save 5 or 10 bucks to bring a $300 motor back to life ?
Bob