I need to have the engine replaced in my 2010 Gravely ZT52HD. The original engine is the Kawasaki FR691V. The mower is in pretty good shape still. I believe it's worth replacing the engine but I'm leaning toward going with a less expensive engine since the mower is 10 years old. Here's the kicker: I want to do the replacement myself. I'm not a professional mechanic but I have maintained my equipment and performed repairs that didn't require special tools or specialized knowledge. 1. Can you recommend a replacement engine that will save me significant money vs a Kawasaki that will not require major modifications for installation? (Briggs?) 2. Do you know of any online resources that might walk me through the process, even if not my exact application? Thank you!