OK, we are all stumped. I has a perfect running motor until I started the preventative maintenance program. Popped off the head, cleaned out the carbon, cleared the decompression port, replaced the head gasket, and now have TOO much compression. Cannot pull start, certainly cannot electric start. Took the pulleys off, the belts off, the carb off, isolated it to the actual compression. What else can I do? Double the gaskets? I have two brand new gaskets. Anybody else have this problem?