Briggs and Stratton engine Model # SV600S

littlebear682March 23, 2013

I'm trying to get a Toro riding lawn mower running. My son lived in Tennesee and mowed his lawn as a last act before moving here to Louisiana. We unloaded the mower and attemted to start it. It cranked over well but would not start. Checked spark and fuel both good. Changed plug and checked compression. Has compression not sure what the reading is. Will not start. Removed and cleaned carburator reinstalled. Sprayed carb cleaner into carb. Backfires thru carb. Checked valves. Push rods intact and the valves seem to be non adjustable. Looks good. Engine just spins with no indication of ignition unless carb cleaner is sprayed into carb and then it just backfires thru the carb. Any thoughts would be welcome.

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First, an SV600 is a Kohler Courage, not Briggs.

Possibly the plunger on the carb fuel solenoid has stuck.
Make sure the solenoid is getting 12V with the key ON.
Listen to it when switching the key ON/OFF/ON.......
It should CLICK.

    Bookmark   March 23, 2013 at 3:18PM
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Yes you're right, sorry about that. Kohler. I had B&S on my mind. (chuckle) I forgot to mention I had checked the fuel solenoid. It is working. It throws me that he mowed nearly an acre and we loaded the mower on the trailor the next day. Hate to admit defeat.

    Bookmark   March 23, 2013 at 3:29PM
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would chk for a sheared crankshaft key. Timing off.

    Bookmark   March 23, 2013 at 7:30PM
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Well, it appears as if the key is sheared. Don't have time to pull it today but will tomorrow. Will post results if it's anything but the key. Thanks for the help. I did not realise how it could be the key from the timing of the shear. He mowed nearly an acre and it must have sheared as he drove it into the shed. Thanks for the help.

    Bookmark   March 24, 2013 at 2:32PM
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Aside from an internal parts failure suddenly stopping the crankshaft rotation, the greatest load on the key is imposed during cranking of the engine if the flywheel is the least bit loose or untight (meaning the retention nut/bolt is not torqued to specs).
If the flywheel is not as tight as it needs to be, the torque load of cranking will be passed directly to the key (instead of directly through the flywheel to crankshaft as designed) and the key will shear.

    Bookmark   March 24, 2013 at 2:58PM
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Hmm..The key was sheared thanks for the insight there. However I replaced it and the machine still doesn't want to start. Has fuel and spark but the spark isn't a real strong looking one. Trying to re-group. What am I missing?

    Bookmark   March 25, 2013 at 11:39AM
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pull engine shroud cooling sheet metal. look for trash/mouse nests. look for evidence of damage to ignition wiring including being chewed by rodents. when correct, you should see a bright blue-white spark jump across spark plug.
If someone has gone wild with a garden hose or power washer , you may have elect problems anywhere. L&g tractors can't stand being drowned..

    Bookmark   March 25, 2013 at 11:53AM
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Cleaned the pick ups on the fly wheel and reset the gap. Fired right up. Thank you guys for your help. Good to have a place to turn to.

    Bookmark   March 25, 2013 at 12:33PM
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feedback much appreciated.

    Bookmark   March 25, 2013 at 2:04PM
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