So recently I acquired an old 2 stroke lawnmower off Trademe for a real good price. From what I can find so far these particular engines were produced between 1954 and 1977 so the mower is very likely older than I am and yet still runs on the first pull.
Whilst the mower runs perfectly I decided to take it apart to have a look at the workings and see what maintenance / cleaning could be performed to prevent any future issues from developing. After removing the top cover the first problem that needed to be dealt with was the massive amount of gunk that accumulated on and around the engine since it was last cleaned. Apart from that most parts looked to be in pretty good order, there were some mis-matched bolts and nuts and some peeling paint but the rest looked to be in pretty good order. The only other could-be-potential-I’m-not-sure-it-could-be-normal issue were a couple of wet patches underneath the carburetor and cylinder head. I guess only once a proper clean has been done will it be possible to know what is really going on here.
After scraping most of the gunk off the shroud and fuel tank Bill and I began stripping off the oily residue and flaky paint that was left behind. The end goal is to get these both to the point where they’re nice and shiny and ready for spray paint. Next the mower was tipped on its side so we could open up the muffler (banana shaped part behind the blades attachment). The inside of this was pretty clean with only minimal carbon build-up so I assume that the engine is running pretty well.
Next step will be removing the engine from the base. We’ll strip the paint from that and inspect the repairs that have already been completed on either side of the base. It looks like at some point the deck has cracked and someone has gone and riveted some extruded aluminum across the crack to hold it together. These patches will then get removed, the cracks cleaned and then properly fixed with some Durafix or similar. Something similar will be done to the chunks that have been taken out of the front of the deck between where the blades spin and the front axle goes. Then it’ll be strip, clean and spray for the deck.
In regards to the engine a good clean will be first, and then an inspection to work out how it goes together before too much more is removed. Following that a greater break down into individual parts for further restoration and investigation into the potential leak. From a first inspection it looks like the cooling fins on the head may also need to be stripped and re-sprayed with some high temperature paint as there is some flaking happening. Hopefully the project should come together pretty quickly without too many issues, the fact that the mower runs well, has good compression and only a small amount of build-up in the muffler means that aside from the oil leak hopefully not much other than a clean and paint will need to be done.