So say I get a used 10 year old lawn mower with no service records. Catastrophic failure occurs and I need an engine rebuild. Is something I can easily DIY, or are the cost of parts not with it or what? Small engines, that you can just unbolt from the mower and pick up or are they really heavy?
Call me crazy, but I wouldn't buy a 10 year old car I want to daily drive for another 10 years plus without any maintenance records at all. Catastrophic failure can be very expensive, parts and labor if you don't DIY. But if I have catastrophic failure on a ride on lawn mower, it's not as devastating and can easily DIY an engine rebuild?
I bought a 8yr old commercial mower with a known bad engine.
I suspect, generally, mower engines are rebuildable, but the failure modes, like in my case, where the block was cracked, make total replacement better and cheaper. You can check out places like
https://www.jackssmallengines.com/ that sell parts for specific mowers.
Manuals, service records, in my opinion are all wastes of your time. To answer your question, these are not like used cars. If you buy a new Exmark, like mine, and you pay $12,000 for it, you are probably having it serviced yearly. But it’s really not as simple as fluid replacements. These things get beat up. They shake and rattle and run into things and hit rocks. So there’s always more to do, things to torque, damage etc. I think these are more like used race cars. They are operated at the edges of their performance envelope.
In my particular case, I bought my mower for $1500. I’m pretty sure just about every part was broken. I stripped it down to the frame, sent that out for powder coating. The deck was cracked, sent that out to be welded. Bought a new engine, new rear wheels, new seat, new clutch, new pulleys and spindles and rebuilt the hydros. I think I put $3500 into it.
I would do it all again in a heartbeat.
Check out this
link for some details & pics.