There is tons of confusion about the Engine Braking System (EBS) on all Polaris models so I thought I would share some info to help you understand it better. My disclaimer, I study this hard and I am not sure even I got this right.

Polaris has not done us much help by using a combination of different clutching components on different models and different years.

The parts first:

The HD design secondary clutch (EBS SEcondary) with removable helix and a EBS notch in the helix

The Rapid Reaction clutch with no helix and no EBS function

Same primaries but two different bearings in them, one has a one way bearing for full one EBS and one has a two way bearing in it.

Polaris used rapid reaction secondaries with only the two way bearing in the primary on all models that have the rapid reaction or better said, if you have the rapid reaction secondary you have the two way bearing in the primary.

Used the EBS HD design with both one way and two way model primaries

Used EBS secondary and one way bearing for those models listed as having EBS on it.

All vehicles have engine braking down to a certain speed or RPM but the EBS we are talking about is when the speed drops down to a point the primary disengages and it starts to free wheel. There is two levels of EBS and the natural engine braking is on all of them.

Those vehicles with the rapid reaction secondary and two way bearing do NOT have any EBS and will free wheel at low speeds.

Vehicles with the EBS secondary and two way bearing in the primary have "more" or "longer lasting" low speed engine braking than the ones without the EBS secondary.

Vehicles with the EBS secondary and one way bearing primary have what we call "Full" EBS and do NOT freewheel ever. They have braking to a dead stop on the engine.

FYI, vehicles with the one way bearing, the bearing has a shorter life span than does the two way since it does more work with the braking action it performs.

Also the belts are tighter on the full EBS models than other due to the belt needs to be in tight contact with one way bearing for it to help in the engine braking, hence the reason Polaris uses three different belts maybe more and I am talking about the 800 model belt here.

Here is the list of vehicles that have what and my list might be off even I get confused but please clue me in and I will add or remove one when it is brought to my attention.

08 and half of 09 800 models have the EBS secondary and two way primary. Which 09's have what? I don't know you will just have to look at yours, the one with rollers on it in two tracks is the EBS one, the Rpaid Reaction has nothign exposed

09 800 S had the EBS secondary and one way bearing

half year 09 Model forward to 2013 50" 800 Models except for one and that is the 12013 Silver LE with Power steering, have the Rapid Reaction secondary and two way bearing.

The 2013 Silver LE with power steering has the EBS secondary and the one way bearing in it.

2010 thru 2013 800 S have rapid reaction and two way bearing

All Ranger 800's have the rapid reaction secondary and two way bearing primary except for the Ranger HD, it has the EBS secondary and two way bearing.

All XP 900 RZR's have the EBS Secondary and two way bearing.

2012 570's have EBS secondary, actually the exact same one as a XP 900 and the two way bearing.

2013 570 LE Models have the EBS secondary and one way bearing.

I "think" all RZR 4 800's have Rapid Reaction secondary and two way bearing.

BTW, we are of the opinion ALL RZR 4 need a Dalton clutch kit as Polaris used same clutching as regular RZR and the calibration is off.

XP 900 4 RZR EBS Secondary and two way primary

Now to make matters worse on the models that have the EBS secondary there are three levels of EBS on them based on what helix is in it. From the factory you will have the full EBS notch on your helix, in the aftermarket world you can get what we call "less EBS" helix and a "non-EBS " helix for no low speed engine braking.

If all of this confuses you and you are in need of some kind of engine braking you do not have and want to know what it would take to get it, call me and I can help you out. Trust me there is no shame in being confused, I call myself knowing this and I am confused and writing this helped me figure it out as well.

The people who make the secondary clutches and helixes also have a aftermarket division and we can buy the exact same parts Polaris uses on all those models just without Polaris written on them for much less money.