COMMUNITY : FORUMS : RIDE

it will make more smoke,and the exhaust gas will be blue

It'll smoke alot, but won't damage the engine. If it is mixed too rich, it could foul the plug. But worst case scenario; you'd have to drain carb and tank and start with fresh gas.

It'll live. I've got three gas cans: mower, chainsaw, and who-the-hell-knows-what-I-put-in-there-last. The third one is the one I use when one of the others runs out at just the wrong time. For example, I knew I'd have to go cut down a whole bunch of trees and didn't want to run out gas, so I mixed up a gallon of two-stroke gas in the thrid can and took it with me. I didn't use it all, so I left it in there and put it all back in my shed. Wouldn't you know it, a few weeks later I run out of gas halfway through mowing my front lawn and decide to use the 2-stroke gas from the third can. No, I decided to use the gas in the can, totally forgetting about the oil. It was only after 2 hours of mowing that I realized that it was two stroke gas. When I was done and things cooled off, I took the plug out and found no oil fouling from that run time. No issue, like I suspected. Oil fouling really happens the most when your air/fuel ratio is too rich because you have a perfect ratio coming in from your carb, and then your four-stroke has worn rings or a tapered cylinder and is letting in oil from the crankcase. Then you're not mixed to burn it all. You will get complete combustion and therefore no real soot if your oil is coming in as part of the correctly mixed air/fuel in the carb. I would normally be concerned about detonation (knocking), but lawn mowers run at a low enough compression that you couldn't get it to knock if you tried. In another example, my neighbor's car (I have never seen a functional vehicle leak that much oil out that many places and continue to function) has been burning oil and belching clouds of white smoke for about a year now, and although it finally developed a miss after about 7 months, it still runs. We have a neighborhood pool on when it'll croak. Still going.

Almost guaranteed, once it runs until is sputters to a stop, the plugs will be fouled. If one "gets it going again" and runs it too much longer it could put a lot of soot deposit on the cylinder and the exhaust valve will become fouled. This means lowered compression (since it will not seat properly) and the deposits on the cylinder walls could eventually score them and then you are looking at engine replacement, if the cylinders do not come out individually.

Errr as long as the mower is running below it's capacity by a good bit it should be safe enough, it'll smoke alot but it wont destroy itself unless it's burning alot of oil and petrol, doing it for a wee while isn't too bad a thing, just go easy on it, the oil contains more energy than the petrol and will burn, at 50:1 i wouldn't be worried, I've done the same thing before with no troubles...