That is really not true on Polaris ECUs because they really aren't learn mode on these units. The fuel curves are hard coded and in order for an ECU to have the ability to have learn mode they need a Mass air sensor and a O2 sensor and Polaris Ecus do not have this ability.

On a carb motor when you order the exhaust they normally come with a new main jet that needs to be changed out when you do the exhaust Pipe....

The people I use for my parts sources system is down at this time but when i looked into this late last year there were two different part numbers. The ranger H.D. and the crew had the same part numbers and the XP was another. I noticed that the Polaris web site does not even list the Xp anymore on there parts list so there may have been some changes to there parts system catalogs. Polaris has been known to change designs mid model run. They could have changed things around from what i see so fare. Polaris will not confirm for you to remove the plate but in the picture it shows the plate and it looks easy to do.....

As soon as the parts look up comes back online I will know more.....

If the drive system was full of water it would slip till all the water has dried out. I would service the drive system and maybe install a new belt if the old one has been ran for a long while. It sounds from what you have said that the engine is running fine but you need to change all the fluids as well dry out all the electrical connection to make sure there if no future corrosion to the connections. You normally will not hydraulic lock an engine through the exhaust but only through the intake and the engine would normally not survive afterwards :idea: .

The AWD system really is not MPH dependent but RPM dependent. If the engine RPM is over 3100 RPM and or traction is stabilized at the front and rear wheels the system will disengage and will not re-engage till the RPM is below 3100 RPM. It may work a little different on rangers without the ECM modules.  The RPM limit is a safety feature so you will not grenade the AWD system. There is no way to fix it unless the ECU is reprogrammed and i do not know anyone that can do that. Even if you can there is a big risk on the drive line :shock:  :idea:.

I knew about the way the system worked when i bought it new and yes I do agree it seems way over elaborate for what it needs to do. My problem was the backwards way they did it. If it does not get the proper signals from the ECM and the ECU as well as the transmission the system will not work correctly. On the 05 till the early 07 model they have had issues with the ECM module and the Polaris term is (Electronic Control Module) has gone out and you lose the drive system as well as other features. At around 2007 till now it is done with the ECU known as the (Engine Control Unit) through the fuse box and relays. This system has not had as much of an issue and is cheaper to fix. The 05 to early 07 had both the ECM and Ecu's in them .

Well enough of this because it all gives me a headache .

That would be the proper way to do any lift on any UTV. It increases the stance to add stability along with more wheel travel. It cost more but it is the best way to do it :idea: .

The way the Polaris system works on the ranger is when the selector is engaged in the one wheel mode it puts a momentary 12 volts  to the rear diff and engages the solenoid and then backs the voltage down just enough to keep the solenoid energized to keep the rear locked in one  wheel mode. As long as the solenoid is hot it will stay in one wheel mode till the voltage is completely removed. In two and four wheel modes the ECM removes the voltage to DE-energize the solenoid and puts the rear in two wheel lock mode, I know this sounds backwards but this is how they did it and I do not understand why :?: . I had some issues with the diff on mine not locking into two wheel and i was chasing my tail in circles to find out why and I nearly had to reverse engineer the dang thing to fix the problem. The manual was almost useless on this issue :x .

Now the way the four wheel system works is even if the AWD switch is on it is in two wheel mode till the ECM senses wheel slip from the back to the front wheels and within a fraction of a second it locks all 4 wheels, as long as the ECM senses the wheel slip it will maintain 4 wheel lock and then will unlock it back into 2 wheel mode when the slipping stops.

Now for the problem at hand, If the switch is in one wheel drive mode and it jumps into 2 wheel mode for no reason at all you are having voltage issues going to the Solenoid and or the solenoid is going bad, That part is not cheap as with all Polaris traditions . If it jumps into four wheel mode while the switch is in one wheel mode that is either a bad switch or ECM.....