Polaris RZR 900

could be a bad front differential 500 on ebay
or possibly related to the no pwer to ins cluster.

fix the cluster first and see what happens.
red wire for power to the cluster wiring harness and connectors

could be disconnected or unplugged or rusted connection causing both issues

Check the safety switches. Maybe a parking brake switch.

No on the timing..sounds like the carb needs a professional cleaning.. and replace the spark plug!!

636 Error is Crank Position Sensor - Check Wiring for short to Ground - Chaffed Wire Or Damaged Insulation - Contact me for additional Help "https://www.6ya.com/philip_b05beb373d913f26"

Kthurst,Possible bad regulator code 168, did not find anything on code Is20230, links below to Polaris forum with good info.

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Error Code 105 Polaris RZR Forum RZR Forums net

polaris code 520207

RZR 1000 Code chart Polaris RZR Forum RZR Forums net

hard to shift gears - Polaris ATV Forum

www.polarisatvforums.com > ... > Polaris Sportsman

Jun 28, 2010 - my 06 500 efi creeps and sometime is a little hard to shift. the dealer told me ... inline. if its off a little when you are stopped and trying to shift the tranny has... 2013 RZR XP 900 .... shop, for first service and to put in a new belt, blew up the firstone already. ... what makes a polaris crew hard to change gears.

Won't shift with motor running. Need help please - Polaris RZR ...

www.rzrforums.net > ... > General RZR > RZR-S Specific Discussion

Mar 6, 2012 - It will not shift in any gear with the motor running, but if I turn it off I can.... First Name: Jeanie ... 2013 Grizzly ... LE - Muzzy, UMP, Donaldson, TS Seats, FixMyToys parts.. and a lot of hard work .... 2005 polaris sportsman 500 shifter problems stuck in reverse ... polaris ranger 700 crew wont shift when running. How to adjust shifter
Nov 27, 2013
Issue: In gear, but will not drive
Oct 22, 2012
Gear Grinding
Oct 7, 2012
HELP trans is hard to shift
Jan 26, 2011
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Ranger Problems & Solutions [Archive] - PRC Polaris

code 85 is the gas pedal sensor (been a very common problem), unplug it, tap it, plug back in, turn on display.

That's sounds strange?
Oil can only leak out or the engine is burning it.?
If its burning your oil valve stem seals are worn it lets oil into your combustion chamber and burn it.
Maybe get a local mechanic to take a look.
Good luck

Serge, Check the attached links,Manuals and guides, Good luck with your Bike
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ATV Service and Repair Manuals
Service Manuals for Download in PDF
How to Diagnose Motorcycle Electrical Problems Dennis Kirk Inc

first fuse box is under the steering wheel and second fuse box is located behind the drivers seat, in left rear wheel well