2008 rhino 700 fuel injected has lots of power but crossfires at 25-30 mph what to do

It might be the spark plugs or plug , but it looks like a fuel, pressure, filter,and injector problems Changing the plug is really easy. If it still occurs , change out fuel and then check the fuel pressures.

Sounds like you losing power in run position. Check ignition switch to be sure power is staying on in run position.

https://www.rhinoforums.net/audio-lighting-electrical/69390-700fi-charging-problems.html
https://www.rhinoforums.net/audio-lighting-electrical/70228-charging-system-problems.html
https://www.rhinoforums.net/engine/51722-rhino-not-charging-need-help.html

https://www.youtube.com/watch?v=Y0-GQnmpdjY
https://www.youtube.com/watch?v=5UoU8C4r6Is

If you are only getting 65lbs of compression, remedying that would be my next move!! .. I have seen some run as low as 85lbs..run very poor too.. but never at 65lbs. You should let the engine turn over for about 5 seconds to get compression level.

Is the water pump operating?

if you are talking about the fuel injection system after installing an exhaust system and fuel management computer its easy. Install all the stock components and remove the fuel management computer. The fuel management computer plugs get plugged back into the fuel injector, throttle body sensor, and factory CDI

Check the gear change lever where it joins onto the side of the engine/gear box. Could have slipped off or stripped the splined shaft. If that is fine and when you move the hi/lo range, and the shaft on the gearbox moves its possible the gear change mechanical levers have broken on the inside of the box.

is your belt contaminated with oil . sounds like its slipping take of belt cover and inspect belt and crank seal , clutch seal.on engine

Belt. Change your belt and ensure that water isn't getting in there. If it's wet or destroyed it will do that.

run a good compression test...