Mower won't engage

Check wiring for ground. Ensure battery is fully charged or replace. Replace spark plug. Clean or replace air filter. check oil level, all mowers have a low oil start cutoff. Bad gas? Flush out fuel tank by removing gas line, flush fresh gas thru. Reattach gas line, fill with fresh gas, always use Stabile in gas! Check fuel line for cracks and secure connection to carb. Battery should read 12.8 volts or higher. .

Sounds like gummed up. Remove carb and filter and clean with gas. Clean all lines. Try not to use ethanol

Does it die when you attempt to engage the cutting deck? If so the you might have a clogged fuel filter, bad gas, dirty air filter, bad spark plug.
Or the mower engage switch may be faulty. They are located in different places on different mowers. But should be attached somewhere along the main pivot of the engage lever. Let me know if you need more assistance. Good Luck!!

check the safety switches

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

If the gas won't even drain from the tank, try removing the gas cap. It has vent holes and if this is plugged, the vacuum won't let the gas drain. If that is the case, clear the holes.
Gary

Have a look at these tips for troubleshooting starting problems with lawnmowers:

http://www.fixya.com/support/r9118692-lawnmower_not_starting

Hope this helps!

Hi,
Just a suggestion O.K?
Carefully check the small fuel lines. To and from the bulb. Make sure the bulb fills with gas.( at least two thirds full. ) There is a small fuel filter on the end of a small fuel line in the tank. A small hook of stiff wire will dig that out. Good luck !!!!

if you are getting no fuel to the plug you either have a stuck float, plugged fuel line or filter. does the gas reach the carb bowl? does the mower have a fuel pump? if so the diaphram might be bad.

Possible Causes Corrective actions
Unit will not start Control handle is not engaged Engage control handle
Spark plug wire is disconnected Connect spark plug wire
Fuel tank empty or stale fuel Replace with clean, fresh gas
Blocked fuel line Clean fuel line
Faulty spark plug Replace, clean, or adjust gap
Engine flooded Wait to restart, do not prime
Air filter filled with dirt or debris Replace or clean air filter