I have a Cub Cadet XT1 18hp 42" Cut. Last season, it ran fine, this season I opened the garage to start it, with jumper cables in hand as I knew the battery would be dead, and new gas. I changed the gas out, drained the lines, drained the carb, and put in fresh, choked the engine, and turned it over. Wouldn't start.
Checked lines and filters again, everything seems to be in order there. Grabbed the plug wrench, checked for fire, and it has a healthy spark. But the plug was dry. Pulled the carb this time instead of just taking the bowl off to drain it, upon inspection of the carb and jets, everything is clean as a whistle. Slapped it back together, plugged in the little wire at the bottom of the carb, and went to try and crack it again. Nothing. Just continuously turning over, doesn't try to start, doesn't pop, nada. Just spinny engine.
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We are into the grass cutting season so I hope you found your problem and now have a nice cut lawn.
I have read where these mowers do give 'cranking' problems but sometimes when you've tried everything all you may need is can of starter fluid to spray in the carburetor when trying to crank as all it may need is just a little help to make it turnover.
Sometimes it is a small thing that most people tend to overlook:
Some mowers have 2 gas filters and these have to be cleaned and/or replaced every season.
Oftentimes a "No Crank" situation is caused by a faulty solenoid, bad ignition switch, or a fault in one of the safety switches.
Theses are small things but can cause big trouble.
Also, be very sure you have a clean air filter every season as no mower will run properly with a dirty filter.
Check Battery connectors ,and you may need a new Battery, if you are having to jump start it between seasons.
You have not checked everything, such as the ignition coil or the flywheel, according to this article www.repairclinic.com/
This may help:
support.cubcadet.com/
I see that you've checked the main parts of your mower. But you forgot about the pipe. Check the pipe from the tank to the carb. Might be a clog or a deposit after a year.
I see that your Cub Cadet XT1 18hp 42" has KOHLER engine. Find here the manual for your model kohlerpower.com/
Here is manual for Kohler's Courage engine 16 to 20 HP: www.kohlerengines.com/
If all this does not help, then there may be a problem in the carb. Can you spray starter fluid directly into the carb and see if the mower starts? But do it only once because repeated use of starter spray can potentially cause small engine issues. If it starts, runs for a moment and then stops, then the problem is in fuel.
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