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It sounds like it's probably a primary clutch issue. I'd take the clutch apart and see if it cycles properly.
Does it sound like its idling fast?
 

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You don't give much in the way of information to us to try to help you out.
Is the RZR completely stock? If not what mods have been done to it?
What is the engine rpms when it starts to bog down?
When shifting into forward or reverse gear does the unit want to move without applying any throttle? If not most likely a miss adjusted or dirty shifter cable, (most likely dirty). If yes Curt's comments are on the right track.

Mike
 

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Discussion Starter · #5 ·
It's all stock as far as I know. It idles fine and seems to run fine until I'd say half throttle any more then that it doesn't seem to wanna open up maybe 30 mph max. Sometimes the check engine light comes on and it run rougher to. And yes it moves with no throttle. It idles down to 1100 rpm. It back fires periodically to

Thanks for the help
 

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It sounds like you "probably" have multiple issues. Creeping without any throttle is being caused by idling too high or because of a bad primary clutch bearing (a somewhat common issue and I just replaced mine).

Running rough and backfiring is probably a separate issue. Have you checked it for codes?
 

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It's all stock as far as I know. It idles fine and seems to run fine until I'd say half throttle any more then that it doesn't seem to wanna open up maybe 30 mph max. Sometimes the check engine light comes on and it run rougher to. And yes it moves with no throttle. It idles down to 1100 rpm. It back fires periodically to

Thanks for the help
OK, better information, I quoted you so I can use your information as a reference. Top speed 30 mph - look to your fuel pump - check fuel pressure at idle and as fast as it will go - if at any time fuel pressure is below 39 psi replace the fuel pump. Jerry has given you good places to look for the creeping, once that is fixed it should cure the difficulty shifting. Now one other major issue with the 2008 machines is the air intake, you need to check to see if you have the intake fix on your machine. Look at the air filter box cover. If it has only two latches on it you most likely don't have the fix installed, if it has three latches you have at least part of the fix. The second thing to check is the large intake line between the filter and throttle body, if it doesn't have any pleats in it then you don't have the fix and have likely ingested dust into your engine and may very need to have at least a top end rebuild if not a complete overhaul. Before you hit the panic button make sure that the previous owner hasn't installed an aftermarket intake system onto your machine. Compare what you have to either your owner's manual or to a 2008 service manual. If you have an aftermarket intake check the filter to make sure it isn't one of those oiled foam filters, if it is, again you probably have a dusted engine needing the repairs that I outlined previously, if it's a pleated paper filter then you are probably OK. (I'm assuming you purchased the machine used from some of the comments you made, I apologize if I'm wrong.) I know I posted allot of information take your time and you'll get through it all.

If you should need a new fuel pump most any auto parts store can get you one - Airtex 8335 as I recall is the one to get. In any event if you need one PM me and I'll look up the information to be absolutely sure. They are fairly popular a few imports and a few Jeep models use them. You can also get them from Alba Racing (Google them) they are sponsors on the RZR forums (who also own this forum), ask for Nate - he won't steer you wrong.

Good Luck - Keep us posted on what you find.

Mike
 

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Discussion Starter · #8 ·
Ok thanks guys another thing I noticed if I have headlights and it has another set of lights on front bumper with those on as well and using winch for plowing it seems to act up a lot quicker then if those are off could something electrical be overheating
 

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Ok thanks guys another thing I noticed if I have headlights and it has another set of lights on front bumper with those on as well and using winch for plowing it seems to act up a lot quicker then if those are off could something electrical be overheating
You might have an issue with the rectifier/voltage regulator. That was a problem on the first generation RZR's and they came out with a kit that relocates it (up near the radiator, if I remember correctly) so it doesn't get hot and cause that problem.
 

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Jerry & Curt are right, I forgot about the voltage regulator problem on the 08's. Check that the relocation has not already been done, look at the left side in front of the radiator, if you see an electronic box with some heat sink fins on it, then it's been moved. If not check behind the driver's seat and look for the same kind of box. It should be one of those two places.
I kind of doubt that it will solve your 30mph max speed issue, unless the only time you tried to run max speed is after the machine was completely warmed up - but I hope it does. Replacing the fuel pump can be somewhat of a pain.

Mike
 

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As I recall (sorry, it's been a while) you used to be able to get them on eBay. Do a search for "08 RZR voltage regulator relocation kit". If they are still available that should find one or more for you. You can also check on the Polaris RZR Forum - RZR Forums.net, they have over 50K members and lots of them have made this mod to their 08 machines.

Mike
 
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