spark plug

I have a 1999 Polaris Xplorer 400 4x4 that will just crank and crank for days, but won't engage to turn over. Below is a list of what I've tried. I'm out of ideas at this point.... Replaced battery with new one - it is fully charged Replaced starter solenoid with new one New spark plug - I...

I have a 2012 500 ho, instead of expensive ps4 could I use regular 5w30 or does it have to be 4 stroke 5w30. Or I saw some people say mobile 0w40, is that 4 stroke oil or is that regular car oil? And is there another sparkplug thats better than the stock one that comes in it? Thanks

2004 sportsman 500HO seems to be getting fuel, getting 12V to spark plug boot but can't get spark out of 3 different new plugs? Is 12V the right voltage coming out of the boot? tested plugs in lawn mower and getting lots of spark threw it?

First off I'd like to thank anyone in advance for your help and ideas. I just purchased a used 2001 Trail Boss 325. I drove it in the desert behind my house a dozen times so far, no longer than 5-15 minutes each time. The other day I rode it out of the garage and it was bogging really bad. I...