I meant to also say that it has great acceleration, spins the tires and power slides with ease. Just no top speed.

 

Top speed- Maybe the clutch kit isn't right for the 30" tires. May be something to do with how the weights are set up.
You might want to put the tune back to stock and see what it will do speed wise, to weigh the Bully Dog setting vs the clutching.
I'm reaching a little here and am learning about this stuff also.
Mine is stock currently and starts moving at about 1700-1800 rpm.

Can't help on the spring setting, sorry.
Good looking machine though!

 

Thanks for the response Sugarfoot. I have to agree, I think so many upgrades were done before I purchased it that taking some of the settings back to stock may help. I have the box with the weights, springs and arms as a starting point.

 

Can't help on where to take it, sorry.
Sounds most likely like a clutching issue. Do you remove the cover and blow them out often? You didn't mention how many miles you've put on in the 2 years but would be my guess it's time to go through them.

 

Can't help on where to take it, sorry.
Sounds most likely like a clutching issue. Do you remove the cover and blow them out often? You didn't mention how many miles you've put on in the 2 years but would be my guess it's time to go through them.

Thank you White Lightning 19! I have put very few miles on it, we mainly use it on our 72 acres and the private roads off property. I do keep the maintenance up but I will take your recommendation and remove the clutch cover to blow it out and inspect the belt. Good advice.

 

Give Troy at Bloody Knuckles in Castle Rock a call. He's super sharp.

+13036635857

 

I really appreciate your reply. I will reach out to him. Thank you

 

Kind sir, take a quick look at this:

Altitude, Air Density, and How It Affects Rzrs

I’ve seen a few posts now overlook the affects of altitude, and so I’m going to present a few things for consideration. Air density, and this directly affects both power and cooling, is reduced by 3% per 1000 foot. HP loss then, at say 10,000 feet, is 30% reduced. Cooling capacity is now...

www.rzrforums.net

Next, while I think all of that post applies, I do suspect it's clutched poorly. I suggest you find out what RPM is considered optimum for the bully dog tune, decide what RPM you're comfortable with, and then make sure you're hitting that rpm while accelerating (often call the shift-out RPM).

If you are, or are within a few hundred rpm (2-3), clutching is not a significant problem unless something is either slipping or absorbing power. Broken or worn in other words, not misconfigured.

As to the exact questions:

1) You need an owners manual for the exact preload. I don't have one, but they are often posted on this forum. Perhaps a search? And yes, adding excessive preload is not encouraged. A little isn't a problem, but it can affect safe handling, so..

That said I never cared much for the Poo method. I suggest using ground clearance from known points. Here is a post (different machine) with a better methodology:

Preload Adjustment - The Right Way - XP1000 & XPT

The Polaris factory service manual recommends setting pre-load by measuring distance down from the top of shock. This is flawed in that it's only good for factory new springs (with no sag) no accessories, no spring upgrades, and no cargo or other payload. Nor does it work for aftermarket...

www.rzrforums.net

2) Depends. They all grab, some belts more than others. The RPM? Well, as the attached post says, you're in a box. The previous owner headed towards more RPM. it's not unreasonable, but may not be your cup of tea either.

3) Probably clutching, but then maybe nothing. You're something more than 30% down on power, and your speedometer isn't reading correctly (it's under-reporting your correct speed). You're never going to get shifted fully out in the machine/altitude/tire combination, so you shift-out RPM is gonna tell the tale.

If it's at the target rpm then all that's left is "is it making the correct HP?" and/or "what in heck is eating up all the power?"

4) I got nothing, but others have offered insights, so...

Good luck!!

 

Thank you Dafish, that made for some good reading. I appreciate all the info. It makes sense and operating at 9,200 feet elevation is tough on any machine for power. When I was buying a tractor for my mountain ranch, Kubota would not even sell me the tractor I needed because it was not Turbo. Luckily, John Deere had the size I needed with Turbo Diesel. This weekend I cleaned the already new air filter, put in new spark plugs and I was able to hit 50 mph! Unfortunately, my buddy was on a stock Ranger 800 and he was faster in top end. As recommended, I will pull the clutch cover, blow out the dust, inspect and see if I can tell what clutch parts I have. I know it is a BMP upgrade, I just don't know the level of upgrade. Thank you again

 

There is also this:

2016 RZR4 900 EPS only goes 40, RPMs high

Title says it all. I had a new secondary clutch installed and it still only tops out at 40. around 30 the rpms are at 6400. It used to go 65. Has a new belt too. Thoughts? Also any good mechanics in the Longmont area? I can do basic maintenance but have never done clutch work etc. Thanks...

www.rzrforums.net

 

You’re welcome.

Do you have a tach? You really need to know your shift out RPM vs what bully dog says is optimum for your machine

 

Yes, I have a tach on the speedo and one on the BMP Bullydog tuner. I am researching the shift out RPM. I didn't get to my ranch this weekend to remove and inspect the clutch cover. I will probably order the HunterWorks belt and have it ready or as a spare. Thank you for all the input.