shaverys 400

I was riding my 400ex one day and when i shut it off to put it in the garage i tried to start it put again to drive it into the garge and it wouldnt start.I put a compression tester on it and its like 30 psi with out throttle and 0 psi WITH THROTTLE.
when i put my finger over the hole it fell likes its pulling my finger in more then its pushing it out 
 
Has good spark.When i took it into the shop the said it had 1oz of oil in it and a tiny pit of metal shaving(TINY BIT LIKE 30 flakes)
When i try to pull start (push start/roll start) it made a not normal sound  and wouldnt stay running.
If my bottom end is blow why would it still turn over fine,
Are my valves siezed or not working properly 
or is my timing off causeing valves to not open in correct order with fire 
PLEASE HELP all help is appreciated 

Some times I get spark some times not can ride then it just dies and wont get spark it has new cdi box and stator but I don't know if it has the pickup coil I'm at a loss

I have a 400 4by4 ,2005 green model,
wounding how many different CDI boxes will work on it
 

Eiger 400 Suzuki runs fine Cook-Out joke face off the handlebars put it back on and will not start now will crank no no spark

View File 2012-2014 Polaris Sportsman 400 HD Service Manual
This the factory service manual for the 2012- 2014 sportsman 400 hd service manual 
Submitter colin james Submitted 02/08/2019 Category Polaris ATV