The first thing I would check is your spark plug. Make sure you have the correct plug. Make sure the plug is not fouled ( excessively wet or burnt looking). If the plug is questionable replace it. Next make sure you have good spark. TIP- while drake plug is connected to the plug wire hold to cylinder head while cranking engine over (make sure the kill switch is set to run). Once you have determined good spark and the condition still exists, check your fuel quality. Look for water is fuel and/or if the fuel is old and varnished. If the fuel is questionable drain fuel system and replace with good fresh fuel. (91 octane or higher) If fuel quality is determined bad, remove the carburetor and disassemble. Clean jets, fuel bowl and blow out passages with compressed air. NOTE- wear safety glasses and rubber gloves.
SOURCE: Why is the flywheel making a grinding noise when trying to start my polaris outlaw 500?
The starter drive on the starter motor is defective. The teeth on the flywheel could be chewed up too. If you just installed a new starter, you may have to add or subtract clearance spacer metal tabs so that the starter drive engages properly with the flywheel.
SOURCE: 2009 Polaris outlaw starter engages but will not start
Is the engine locked up? check that first. Pull the starter and see if you can turn the flywheel, if not the engine is locked, pull the plugs and check for liquid lock, if the engine does turn the starter may be defective have it tested.
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