Instructables

4stroke mower overfilled with oil

my masport 4 stroke filled to top with oil,its in muffler as well, how can i fix it,can i just tip it on it side an drain it,how do i get compression back,it had none since being overfilled.

lemonie3 years ago

For my interest, how did this happen?

L
If you have oil in the muffler, you have really flooded the cylinder, fouling everything. Drain the gas, then drain the oil. Now refill the oil to the correct amount/height. Remove the spark plug and rinse/clean it in some gas. If there is any build up, scrape it out and make sure the gap is correct. Spin the engine a couple of times to actuate everything. If you see any oil at the spark plug hole, spray a small amount of gas through the spark plug hole and spin the engine to distribute the gas. Reinstall the spark plug and put some gas in the tank. Remove the air cleaner, place your hand over the carb throat and spin the engine a couple of times. You will partially flood the engine, but this will thin any oil left in the cylinder and intake/exhaust ports. Replace the air cleaner and try to start the engine as you normally would. You should have compression by now and the engine should be trying to run. If it feels like it is still flooded, remove the spark plug again and spin the engine a couple of times with the throttle in the off position. Reinstall the spark plug after a few minutes and try to start the engine normally. It should run. It will probably be a bit rough and smoke, but this should pass once the oil burns away. If the engine still runs rough after the smoke clears, clean the spark plug again as it may be fouled.

Good luck,

Qa
I MIGHT be tempted to flush the cylinder with some gasoline

Steve
caarntedd3 years ago
Yes. Tip it out, let it sit for a while, check the level, and slowly add oil until correct. IF this doesn't work, there may be another underlying problem.
Pro

Get More Out of Instructables

Already have an Account?

close

PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!