Because big break ,is possible that the piston rings to be stuck on their channels, due to burnt oil deposited in operation, if one of the many km as possible and wear rings, cylinder liner etc.
You need a solution to wash and degrease the segments, pour it into a cylinder, before you pull out the spark plug, which you search if it is wet and smells gasoline, it is a sign that it is fed correctly with gasoline ... do not overdo it with the washing solution, a 50 miles is enough.
Close gasoline, if you can not remove the hose coming from the pump, to the engine to avoid aspiration of gasoline while washing the cylinder, and do some startup maneuvers, plug the spark plug hole with a finger towel, thus preventing immediate evacuation of the cleaning solution and thus wash the cylinder and clean the segments, and observe the compression. After a few such maneuvers, all the cleaning solution will be discharged from the cylinder, now put a clean cloth in the spark plug hole, that the cloth no longer has anything wet on it, it is a sign that there is no cleansing liquid in the cylinder.
repeat the idle operation to make sure it's airy, fit a good spark plug, put the gas hose back on and have to start.
Preventive, check the air path, not clogged, clogged air filter, etc.
Good luck!
maybe the battery is ok but the problem is a lock in the engine --hydraulic lock, crank seizure ,bent conrod
bent valve hitting on piston top
SOURCE: spark plug gap for a Polaris sportsman 500 year 2010
.070 or 70 thousands of an inch. Please leave feedback. TYVM
How old is your gas?
First thing I would do is drain or siphon out as much of the old gas and start with new gas from a gas station not out of a can with >6mos old gas in it. Gas degrades over time, losing its octane and turning to varnish. Do you use Sea Foam or Sta-bil?
Stay away from E rated gasoline especially E15 or E85 if its sold where you live.
SOURCE: I put a winch on my Polaris 2014 sportsman touring 570 and now my check engine light is on, Why!
Have the system scanned and find out what the fault code is for that was set when the light came on, that is how it is diagnosed
My 2017 Sportsman 450 ho is doing the exact same thing. It’s been at the dealership over a week now. Only 100 miles on the bike. Haven’t had it quite a year yet. Let me know if u figure it out.
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