Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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The st arter engages but will not over come the

The starter engages but will not over come the compression to start the engine

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I have had the same problem from time to time. I turn the ignition OFF and then manually rotate the engine as far as possible in both directions to free things up a bit. Once the starter gets a "running start" at the compression, it will generally start cranking.

Posted on Mar 11, 2009

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Make sure you have a good, charged battery. Clean all the connections on the battery, the starter, and the ground (black) wire on the frame. If it still does not work, the starter my have an internal short. Hope this helps.

Posted on Mar 02, 2009

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I've been having problems starting. (Slow turnover) Finally would not crank and assumed it was the battery. Got a new battery and still will not crank, not even spin. Blade switch is off and I checked...

A fuse would not prevent the engine from spinning, good or bad. What would prevent it though, is a compression build-up inside the cylinder(s) of the engine. These engines have overhead valves.These engines also have a built-in compression release feature that is activated at low (when starting) engine speed and cancels when the engine starts running. It works off of the camshaft and allows the intake valve to open ever so slightly on the compression stroke so as not to overburden the starter. Remove the valve cover(s) and adjust those overhead valves. It is not hard. Here is how it is done.

Read the section (pictures are included) that says "Adjusting Overhead Valves".

May 24, 2011 | Craftsman 26 hp 54 in. Deck Deluxe Yard...

1 Answer

Craftsman 17.5 hp, Starter will engage, will not go past the compression stroke. Checked valve clearance, it is fine. Mechanic says it's probably not the starter. HELP?!

I'm not sure of the engine in your machine but i can tell you that all small gas engines have some sort of de-compressor,be it on the cam or a simple" bump" on the camshaft.It sounds like yours is not working.Some briggs engines need the valves adjusted until there is only 120lbs of compression during cranking to aid in starting,when it does start the compression will go back to normal as it comes off that "bump" with engine rpm.Check with your dealer for the proper adjustment of the de-compressor.

Mar 23, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

2 Answers

I have a briggs and strattan 18 horsepower engine on my craftsman mower and it wont start, i replaced the starter and it still wont start! It wont even turn over, in fact it binds the starter, but if I...

Have the battery tested at an auto parts store to ensure there is enough power in it. Sounds like it's strong enough to turn the motor with no compression (spark plug removed) but too weak to turn the motor with compression. Also check for loose or corroded wires.

Sep 20, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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