150 compression is low. That alone can make it run poorly. Check fuel pressure cause fuel pump is a known problem on these things. Get a repair manual. Could be many things out of tune. It's a very fine balance to tune the 800 to perfection. Mine always ran very sputtery and inconsistent for years.I've been through everything on it and even a rebuild due to dusting. Another unfortunate common flaw on the 800. After I rebuilt the motor it's ran smooth and flawless. I've never had the problem of not revving to 6k rpms but oil pressure fuel and compression I would think would be the cause. I would monitor your oil pressure with a gauge to see if PRV isn't sticking. Good luck.

 

Sounds like the machine may be in limp mode.
Are you showing any codes on instrument cluster?

Here's a link to download a service manual & page from manual showing how to check codes.

POLARIS 2010 RANGER RZR 800 EFI MANUAL Pdf Download

View and Download Polaris 2010 Ranger RZR 800 EFI manual online. 2010 Ranger RZR 800 EFI utility vehicle pdf manual download.

www.manualslib.com

 

Thank you for the link man I appreciate it

 

It's been a while, but my fuel pump came in the other day and somehow made it worse, the original fuel pump had 25psi of fuel pressure at idle, and was the original polaris oem ( i repaced with a quantam), still don't have any codes popping up, looks like the previous owner had tried to adjust the tps, could that be a problem. I have a tps tester harnes on the way now any recommendations in the meantime. Thanks once again

 

What does the quantum fuel pump psi read? You need ~39 psi.

Yes, if the TPS is off it is not going to idle or run right. You still have 150 psi compression which is the bare minimum so may be time for a rebuild.

Also check the oil prv that it isn't sticking.

And lastly, take the valve cover off and see if there are any gaps between valves/rockers/push rods.

 

I have 90 PSI and it runs fine-enough. I had exactly the same problems as OP and it was the fuel pump. Kayden make sure your vent lines for your gas tank are not clogged as well. If you pump the gas while accelerating does it exceed 4000 rpms?

 

Fuel tank vent lines are clear. I put my tester and 2 of my buddies testers on the brand new fuel pump and only have 32 psi, are quantam fuel pumps junk? Anyone have any Experience with them? I sent an email to them today we will see if that goes anywhere

 

Was that a drop in fuel pump? If so those are expensive and I would return it. I rebuilt mine with an Amazon kit. Was only 20 bucks. Was pretty easy but that plastic is brittle. If I have to do it again I'll buy a drop in. Yea you're supposed to have 39 psi or above. That's why it's running worse but bottom line is your compression is low to point of rebuild. Does the fuel pump have a pressure rating? They all state the psi rating either in manual or description.

 

Was it just the pump or was it the whole assembly unit? Just a thought if you only replaced the pump - there is a fuel pressure regulator that could be restricting it too much (see picture). Where are you checking your pressure - at the fuel rail or right above the gas tank mount?

 

I got the whole assembly, I'm checking it right off the pump with a pass through tee fitting, and I understand it has low compression, and may need a rebuild, I'm exploring all possibilities and avenues before a have to break out the checkbook, Thanks again guys you have been very helpful

 

The compression spec in the manual is 150-200 psi. I'm not saying a rebuild would not be a good idea (it's always good to get in there) but don't be surprised if you get it all back together and its the same. Mine idles fine at 90 psi and I can hit 6000 rpm with ease. 32 psi is way too low. Mine hits 42 psi and it's a unbranded china special off ebay, $80 shipped.

 

So after a lot of waiting I finally received my new fuel pump from quantam fuel systems, and I installed it and it works good all of the pressures are good and the dosent drop under load, I also installed new ngk plugs, and for some reason it still dosent want to rev over 4k rpm just boggs and hits a wall, any more suggestions, thanks in advance.

 

Could be many things. Check oil pressure. That might cause it. Could be a stuck valve or air leak in system. Mine leaked really bad at the head intake. Was bogging but still would rev to limit. I've been through most problems on mine but it revving to limit was never an issue and my motor was dusted beyond belief. Not sure bud. Good luck.

 

Just to clarify, it bogs at 4000 while in neutral? This would rule out clutch.

 

Probably lifter or valve I would think as well as compression. Lifter usually means camshaft. When my motor got smoked on the trail from dusting it still drove but very chattery and crappy. One of my lifters were so mushroomed you couldn't pull it out from top. Had to pull it down through crankcase. I know the OP wants to save money but Rebuild is probably the only way to solve the issue.

 

I'll look into getting the tooling to check oil pressure, do you guys have any recommendations for rebuild kits, wiseco, klama, hot rods or rev6, I'll have to test the oil pressure, then worry about tearing it down. Thanks again

 

Me and my buddy went with Niche. Was 260$ with new jug,pistons etc. Both run perfect. Rev 6 is the best quality and closest to OEM. I would dig into it before ordering and see if camshaft/lifters are damaged. Then you'll be pulling the motor to repair. My recommendation is to atleast clean head,lap valves and replace exhaust seals. I fear since your machine is not revving the camshaft might be damaged. It might also be a weak lifter as I've read issues like that where camshaft is good but lifters were bad. Only way to know is dig into it. Just post your pics of lifters and camshaft and one of us will chime in to help you verify. Before digging into it I would take valve cover off and run it to see if lifters,push rods are operating like rijoh2000 said. You don't even really need to run it cause if a lifter is collapsed you should see a gap on rocker arms/pushrods. Good luck

 

Hello everyone, today I had pulled off the valve cover and everything seems clean and tight with oil flowing, no collapsed lifters or lose push rods, and the valves are opening and closing,this might be a dumb question but is there anyway to adjust the valves? Thanks in advance

 

No. The valves are not adjustable on this motor.

 

Well I rebuilt the engine and installed thr oil pressure relief valve and still, not working debating setting the thing on fire currently. Anyone have any other suggestions?