Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Model number 917.257561 18 HP Twin Cylinder We seem to have to crank and crank. We changed the spark plugs and installed a new 300+ CCA Battery. We are unsure if we should choke it until it fires or not choke it and see what happens. We have it at WOT and choke it. Once it is going it seems to run fine. Should we try an "add to gas" engine cleaner (Gumout Seafoam, etc.)? On a side note: We are looking for ways to add weight to the rear to balance out a front snowblower. THANKS

Well the choke cable has actually fine. Just the outer casing was worn. Now I am worried that I did damage by switching to synthetic oil. I was hoping to get better cold starts (we live in MN), but I am now reading about synthetics damaging seals in older engines. I checked the oil level and it seemed low. I see no spots on the ground, so the engine must be using oil. Should I switch back to regular (mineral) motor oil? I pulled the old plugs and they did not seem too fouled up. I am worried that with the new synthetic and using Seafoam in the gas I might be loosening up the gunk that is holding the engine together.

ramper wrote:

The only known problem to me with synthetic on older engines is the oil will burn more as blow by getting past the rings but can also leak through seals. I can't imagine you ran it that long to get a low reading when you checked the oil. You may not have initially put in enough oil. I would keep a non synthetic in it. If your rider isn't sitting level it wont be able to start due to the low oil safety switch. Awhile ago I was using a pressure washer on my driveway which is sloped and couldn't start it due to the same switch scenario. I just turned it around 180 deg and that ended my trouble. I did check to make sure there was enough oil while it was on a level surface.

So even though the synthetic has only been in the tractor for less than two weeks you would recommend that I change the oil again and switch back to a traditional oil?

I would say so but lets wait for more opinions on this. Did you add more oil to see if it would start due to the low oil safety switch issue? Also is your rider on level ground? Do you know for a fact gas is coming to the carb? Was your plug wet when you took it out after trying to start? let us know.

I did add oil and it did start eventually. The tractor was on level ground. The synthetic "seemed" to make the tractor start better on cold mornings.