Check this out....The engine used to start up, but was running sloppy because it had been sitting for a couple of years before I bought it. I fugured it was a fuel problem, so I had the carb rebuilt, and when we held up the jets, they were clogged (guess that's why it was running so sloppy). Cleaned everything, replaced parts, and reassembled. When I put the carb back on the engine, it wouldn't even start at all. Doesn't make sense to me....any ideas out there??? Thanks