Ok need some help. I have a 2015 Polaris 570 sportsman that wont start. Sat for a little of 2 years. Replaced the battery and flushed out the old gas. Still wouldnt start unless I blocked the air but would die the moment I let off. Called the service dept and they said it sounds like not enough pressure from the pump. Replaced it. Turns over just wont start. Checked for spark and compression good there. Thoughts???
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.
on Mar 10, 2019