Do not drill anything - This engine is just extremely tight. It is like that to give better compression.

I have a Hyper 7 PBS and it comes with an OFNA starter box. It is not powerful enough to start the car. I had to buy a more powerful starter box from OFNA. Then it starts everytime.

Make sure the piston is at the bottom chamber when you start it up and after you cut it off. Do not let it cool down the the piston at the top of the chamber. It can hurt the motor.

After about 8 - 9 tanks you will be happy. It is a very good motor.