Of course a harbor freight engine might take away some of the nostalgia of the machine and may not last as long as the orginal engine pulling the weight of a MF tractor. It could last several lifetimes because of how good they are, and of course you could buy another Harbor Freight engine, if for some freak reason the 150.00 lifetime engine gave out, lol. I'm really not a fan of putting foreign made engines in tractors made by American Union workers, kind of like a insult .I understand repowering if you already have a new engine like Briggs Vanguard or a Kohler Command, but I wonder about the financial wisdom of spending upwards of 1800 on a new twin or 1000 on a new single as much as I wonder about that same financial ramification of a low cost engine. Sometimes you can be penny wise and pound foolish and visa-versa I dont see many 69 Camaros with Kia engines, wonder why? Seems like it happens to old GTs all the time. I have friends that always ask my advice, but in reality they only want me to tell them what they want to hear, we all do that to some degree, catching ourselves doing it may be akin to an epithany. Everyone must blaze their own trail and therefore end in a different Eunomia. Good Luck
I thought it sounded like he was going to have to spend an over 300 bucks to do what he wanted and it also sounded like labor may not be figured in to that. Yeah I hate like hell to have to do that type of a repower with an asian engine but a matter of what I can afford and how bad I need to cut grass or push snow are the main factors why I would consider it. My 2 Massey are my work horses and I gotta do whatever it takes to get them in service again if they break, nostalgia or not. So far I haven't sent any engine money to China on them. I am on some truck forums where you could get crucified for having a Chevrolet engine in a 50's GMC (which I have I'm afraid) so I know what you mean with your Camaro Kia comparison. Just depends on how extreme other folks take things.
Personally, I'm very leary of putting in a new piston and rings without overboring. But, I haven't rebuilt a lot of engines either. My first two Gravelys got rebored by someone who dealt with Gravely engines on a regular basis, with new pistons and rings. That has been over 15 years ago, and both engines are still going strong.
First, maybe Ben can tell me if that piston will work in my engine. If not, I may try using a standard size piston to rebuild.
I have dang near zero experience with the HH120's but done a lot of automotive engines and quite a few 5 horse B/S go-kart engines thru the years. If a used cylinder don't have too much taper or a ridge, hone it out and keep the same bore long as possible. Just a measure to make the block last long as possible.
I totally agree with you about reboring, IF they mic out within tolerances okay, but seriously is ANY 40 year old engine going to mic out within tolerances, I doubt it. I could see it happening ONLY to a engine that wasn't used or run 75 percent of the time. I could see it more on a walk behind than a rider though, so It could happen, but so could misreading a micrometer, I do it, the guy at the shop can do it, were human. If the parts were more readily available it would be a no brainer as the boring is only about 75.00
I guess my '75 HH120 is only 38 years old--LOL. Dang-it was brand new when I graduated high school---Anyway, I think the standard bore will be ok with it, BUT I sure do understand that my engine is probably the exeption to the rule and normally they just can't be left the stock bore after all those years of use. Since I don't have a dial indicator for cylinders or snap guages or inside mikes, I used the new piston to push a new ring into a bunch of different positions in the bore after I honed it. I kept checking the ring end gap in each position and it was .019 to .020 right on Tec
specs everywhere I tried it. Redneck way of doing it but it is a garden tractor, not a race engine.
Edited by MFDAC, August 21, 2013 - 10:49 PM.