I have a Ea81 engine that I am using for a small tractor that I am building. I don't really know much about this engine but was told it ran good when it was pulled and it was cheap so I decided to go for it. I want to strip this engine down to the bare minimum it needs to run since emissions are no concern to me. Can I keep the factory carb or do I have to try and find a different carb since there are a lot of electronics on the carb? I also was wondering about the rotation of the crankshaft bolt, I tried turning it both ways but it won't budge, just wanted to know if it was a left hand threaded bolt by chance before I put a bigger impact gun on it. It needs to come off so I can adapt a different pulley to the front to run my hydraulic pump.