I had a little trouble with a valve on my 8n when I first bought it, back around 1989. I bought it from the widow of the original owner. It only had 1200 hours on it, but it didn’t have any compression on one cylinder, due to that broken valve.I do like the N models. The only downside for me is the flat head. I know a lot of people like them but the problem with a flathead is the valves are in the engine block so if you need to do a valve job it's in the block, not the head, so you cant throw the head on the table and do a valve job. And if you have a serious valve problem you may need to replace the block rather then the head.
I bought an N model once that seemed to turn over way too easy. When I pulled it down it had 5 valves that were stuck open. So 3 were still working. Some of the seats were questionable. In the end they cleaned up ok but for a while I wasn't sure if it could be saved or not. I wouldn't have taken the block in to have seats replaced but I might have if they were in the head.
After replacing just that one, it was ok for a couple years of relatively light usage. A couple years later, I wore out a few more valves, while digging a pond with a 3-point scoop.
The trouble was, those original valves didn’t hold up very well on unleaded gas. A very good mechanic buddy of mine did a complete valve job, with with all new parts, and that that tractor has ran great ever since. With 2200 hours on it now, it still has enough compression to start good on just 5 volts. That’s all I can get the 18 year old 6 volt battery, that’s in it now, charged up to.
The original proof meter cable snapped on it at about 1800 hours, and I put a few hours on it before I got it replaced.
The hanging needle nose vise grip holds the choke slightly closed. It’s needed that, ever since I replaced the original carb with an aftermarket one.
I replaced a few other parts on it over the years including the gas tank (original had a slow leak), the radiator (I put a branch thru that while snow plowing), the distributor (I didn’t oil that every 10 hours like it calls for on the manual), and a rear rim (calcium rusted that thru 2 years ago). The tires and paint are original.
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