I bought a 13 800 with 2684 miles and 183.6 hours. Pulled the plugs do not think they have ever been changed. They are champions did this come with champions? Also wondering if there needs to be any valve train adjustment with this many miles and hours. It seems to have a pretty loud rattle at certain rpms. Replaced the pins in the clutch as they had clear wear on them weights were snug with new pins so did not replace them. Rollers all seemed good. What about the one way bearing does the spider need to be taken off and the bearing cleaned and lubed? Going to do a cold compression check what should cold compression be? Should injectors be good still at this mileage? I know absolutely no history on this machine as I bought it from a dealer and they are not to lose with customer info. Any help would be greatly appreciated. Also anything over and above the questions I asked would be helpful also.
Google the 2013 Rzr Service Manual, it is your best friend. Find a link like:
http://tinken.com/rzrforum/servicemanuals/2013 RZR, RZR4 800 Service-Manual.pdf
Here are a couple of thoughts:
Champions spark plugs came with it and the manual recommends them but NGK will work in the same heat range.
There is no valve train adjustment. Some knock is normal. These are flat tappet cams and do make some noise. If the motor has ingested dust, it could have worn the valves, piston rings, and rods etc. No way to tell without breaking the engine open. Use a good oil with zinc and change it often.
The clutch bearing has seals on it, but they can wear. Polaris doesn't specify to lube the clutch bearing not to say it shouldn't be done but I don't know that I'd do it specifically unless you had the clutch out anyway or if it's squealing etc. Take the clutch cover off and see how it moves with the engine off and on. If you take it off, clean it but don't cake it with grease as it can gum it up if you use too much.
Compression should be 165-185.
Injectors should be good. If you think you have a fuel problem I would check fuel pressure as the fuel pump is more likely to go out.
You have relatively low mileage. I've had 2 Rzr's and got around 6K on one and 8K on the other before rebuilding the top ends. Some people get even more. Dust is your biggest enemy no matter how many miles.
And lastly, make sure you do the pinion nut repair.