the arrow points to the ground? i thought it was supposed to point up towards the intake? maybe that is my problem. the instructions that came with the kit said it wouldnt need a reed valve anymore. i did the whole spark plug on the engine and it definitely sparks. i thought the piston was the same on the top and the bottom although i could be wrong. hopefully thats the problem and it will be easy to fix. thanks again guys. i will keep you updated.