My lawn mower starts up but seems like it has no power to rotate the blade. Added oil, replaced air filter and the spark plug but still has no output power.

Battery required? Charge battery or replace. Replace air filter and spark plug. Dump out old oil and replace with 30w oil. Electric start may have a fuse blown. Dump out old gas fill with new with Stabile always added to gas. Try spraying starter spray in carb at air cleaner with filter removed. All mowers have a low oil sensor to prevent starting on low oil. Remove bowl from carb, should be full of gas. Pinch off fuel line with pliers or turn fuel valve off. Check float should be hanging down allowing fuel flow. Float up stops fuel flow.

Remove spark plug. Pull rope several times to blow out cylinder. Spray WD 40 in spark plug hole. Pull rope several times. ensure compression is present. Replace spark plug with new one. Spray starting fluid in cylinder before replacing spark plug. Ensure plug wires snaps on tight. Check oil level, fill with 30w oil if required. All mowers have a low oil start cutoff. Clean or replace air filter.

Not enough torque. Only use 1/2 width of deck on tall grass, go real slow, Ensure side discharge is open! Ensure blade is sharp. Replace spark plug once a year and clean replace air filter. check oil level 30woil.

No adjustments. Automatic governor. Replace spark plug. Ensure blade is sharp and oil is full. 30w oil. Always put Stabile in gas. When you remove spark plug pull rope several times to blowout cylinder. Spray a little WD40 in spark plug hole, then pull rope several times. Spray starting fluid in spark plug hole, replace plug, ensure plug wire snaps on tight. Clean replace air filter.

have 15.5 yardmachine will turn over but not start check spark plug oil filter changed gas runs fine and blade handle up

HELLO,
You can fix these yourself, all you have to do is to follow the instructions below,
1 Remove the spark plug lead from the spark plug and move away from cylinder head. Always do this before attempting any repairs to a lawnmower.
2 If your lawnmower is a "four stroke" mower (separate gasoline and oil), tip the mower so that the spark plug is pointing skyward. Never tip it on its side with the spark plug to the ground.
3 If your lawnmower is "2 stroke" (oil and gasoline mixed) turn off fuel tap. You can tip a two stroke mower any way that is suitable to you.
4 To change a blade, or blade disc, it is often easier to remove the spark plug and feed a length of string into the cylinder head to 'lock' the piston while trying to un-do the blade bolt(s).
5 Check the motor's "air filter" while doing this sort of maintenance as a dirty or clogged air filter will affect engine performance and increase fuel consumption of your mower. Symptoms of a clogged air filter include inability to start, starting and quickly stopping after several sputters, or a weak idle. You may also see oily or smoky exhaust.
6 If your mower is a "four stroke" model, change the oil at least once a year. When it is tipped over with the spark plug in the air, is a good time to remove the "oil fill" plug and drain oil into an old ice-cream container for recycling.


I hope this will help to solve the problem.....

1. what is the model, manufacturer and year of mower?
2. has any maintenance been performed on this mower?
3. if no, try replacing the spark plug and air filter (it's possible the spark plug could be fouled and/or the air filter is clogged) be sure to follow the manufacturers recommendations for oil, gas, filters and plugs.

routine maintenance involves:

1. sharpen/replace blade
2. oil change
3. replace air filter
4. replace spark plug
5. new gas

if you bent the blade most likely you bent the crankshaft too.
Remove the spark plug and pull the rope and remove excess oil from the spark plug hole
check the spark plug for spark if you have none then a flywheel key is sheered a more in depth fix.
If you get it started you may notice a whole lota vibration due to a bent crank shaft or maybe not?

Bad news , Mower has sit up too long and the piston / crankshaft has become rusty and froze in place. (fix) buy some liquid wrench it comes in a can at your local hardware store...Tilt the mower onto its front wheels and remove the spark plug. Fill the Cylindar with the oil and leave it for a couple days. after a few days lean the mower back and attempt to pour out the left over oil. Then (Check Your Oil level) preferable replace old oil and pull choke..and start mower...if the engine is still frozen (Buy a New mower) 125bucks Sears.

Hello PANDJ4952, Check your oil level first. If low or a dark color it needs changing. I suggest you change spark plug and air filter too. With the engine cold clean the fins around the spark plug location of caked up mud or clogs of grass including under the mower where the blade rotates. Please let me know of the results.