I went out for a ride yesterday and after a few mins of riding I started to have a lose of power, I thought it might be the clutch not working right, I was in lots of sand. Went to hardpack and same issue. I started to get backfire everythime I lifted off the gas. My display was also losing brightness, Like the back light was going out. I limped it back to the truck and came home. Did a compression check today 140 and 145 psi WOT. the 1 spark plug did not feel tight. I also found that the wires on positive terminal was loose and the air filter was full of dirt, plastic and sand. Is that compression ok, anything else you think i should check. The machine has 5400 miles on it. I kinda want to just buy a reman engine and drop it in. Also how do I know if the fuel pump is good?
Barnold911
Fuel pump pressure should be around 39-44. I think the newer 800 models ran a little higher but not much.
Compression is low. Not terrible but lower than spec. Should be above 150psi.
My 2008 800 backfired on deceleration due to a crack in the exhaust manifold. Didn’t cause a power loss but the backfires were somewhat impressive….especially after a long up hill climb followed by taking my foot off the gas for the downhill.
A clogged air filter definitely would cause a power loss. The 800 models were bad about pulling in dust into the air intake due to the location. The so called “grumpy mod” is the best thing to prefilter the incoming air. You have to clean the prefilter regularly (daily in a dusty environment) but it’ll drastically preserve the life of the expensive main filter. I also have a Outerwear filter cover on the main filter andit helps also keep dust out of the main filter. I just changed mine after over 1000 miles of riding and the filter could still be working fine…..I just like to replace it before it’s needed.
Ultimately I think you will need an engine rebuild.
Compression is low. Not terrible but lower than spec. Should be above 150psi.
My 2008 800 backfired on deceleration due to a crack in the exhaust manifold. Didn’t cause a power loss but the backfires were somewhat impressive….especially after a long up hill climb followed by taking my foot off the gas for the downhill.
A clogged air filter definitely would cause a power loss. The 800 models were bad about pulling in dust into the air intake due to the location. The so called “grumpy mod” is the best thing to prefilter the incoming air. You have to clean the prefilter regularly (daily in a dusty environment) but it’ll drastically preserve the life of the expensive main filter. I also have a Outerwear filter cover on the main filter andit helps also keep dust out of the main filter. I just changed mine after over 1000 miles of riding and the filter could still be working fine…..I just like to replace it before it’s needed.
Ultimately I think you will need an engine rebuild.
So I also just relized I am low on Oil. Man I am better than this. I normally check all the fluid every trip and do a full fluid swap when i buy it. Just out of sorts this last past year.
Your compression is way low. Sounds like motor is dusted and needs a top end rebuild. Not hard and is around 300 bucks. Being low on oil shows its burning it as well. Very common on RZR 800 especially riding in sand.
Yea it runs good other than the loss of power. I am going to buy a oil pressure and a fuel pressure guage. I am a little scared of doing a top end on a 4 stroke.
Ok so I am going to just rebuild it.
Anyone use one of these kits.
Niche
partdiscounter.com
DG
Cylinder Works/WISECO
Anyone use one of these kits.
Niche
Top End Kit Cylinder Piston Gasket For Polaris MK1003421
In-Stock Replacement Parts for Polaris | Ranger 800 Ranger Crew 800 RZR 800
partdiscounter.com
DG
2008-14 Polaris RZR 800 RZR800 Std 80mm Durable Cylinder w/ Piston 10:1 Gasket | eBay
Find many great new & used options and get the best deals for 2008-14 Polaris RZR 800 RZR800 Std 80mm Durable Cylinder w/ Piston 10:1 Gasket at the best online prices at eBay! Free shipping for many products!
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Cylinder Works/WISECO
POLARIS RZR, RANGER 800 TOP END KIT WISECO PISTONS, CYLINDER, GASKETS 2005-2010 | eBay
New set of standard bore (80mm) 10.2:1 Wiseco forged pistons, cylinder & top end gasket set w/valve seals. Polaris 800 EFI engines 2005-2010.
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