Why does my lawn mower spark plug have oil on it?
One potential source of oil on your spark plug is a blown piston seal. The seals keep oil from leaking into the combustion chamber and, if blown, can manifest themselves by spraying oil on the spark plug. This is not a user-serviceable part, as it requires an engine rebuild.
Correspondingly, can spark plugs cause a lawnmower not start?
A dirty or fouled spark plug can cause your lawn mower to not start. It can also work itself loose, causing issues. If the spark plug appears to be seated correctly but the engine doesn't start, a new one may be in order. For a few dollars, this easy fix can get your small engine working again.
Considering this, how do you know if a spark plug is bad on a lawn mower?
Here's How to Know if a Lawn Mower Spark Plug is Bad
- You can't get the engine to fire up at all.
- You have to tug extra hard for longer than usual on the rewind.
- Your lawn mower loses power while moving.
- The gas runs out quicker than it used to.
How do you fix oil on spark plugs?
How to Fix Oil on Spark Plug Threads ✅ Why is there Oil on the Spark Plugs?
- Step 1: Remove the valve cover.
- Step 2: Clean the underside of the valve cover.
- Step 3: Install the new valve cover gasket.
- Step 4: Reinstall the valve cover gasket over the engine.
- Step 5: Install the new spark plug seals.
- Use fresh gas. Old gasoline can cause starting difficulties. ...
- Check the spark plug. ...
- Use the choke. ...
- Prime the mower. ...
- Check the air filter. ...
- Check the cables. ...
- Check for water in the fuel tank.
- Clear the starter cord of blockages.