Guys, you’ll kill me. Why would you waste even 30 min on something like this. You can dress up a pig, but it’s still a pig. Time is everything in this business. Spend the time and effort in marketing, learning your trade, etc. But spend the money and get a decent sized new machine that you can pay for in a couple of weekends… If it’s going to be the foundation of your new venture you don’t want to be rebuilding engines, pumps etc. If you want to rebuild small engines, open an engine repair shop.
If you can’t afford it right now, get a part time job flipping burgers or delivering pizzas or something for a month or two and put every bit of the extra money towards your equipment. I’ve had a lot of businesses and I made the decision based on experience that when I bought a piece of equipment it was going to be the best there was within reason, because I wanted to grow the business, not worry about my equipment or spend time tinkering with it. Trust me, as your business grows, you’ll have plenty of stuff to tinker with, modify, etc to keep you busy w/o worrying about the core items of your business.