2019 Sportsman 850 to 1000 engine swap

So my buddy swamped my brand new 850 Touring SP with only 7.6 hours on it lol and the engine is toast. I’m going to be putting a 2018 1000 engine in it because I got a good price on a used one. I’ve been cross referencing part numbers for days to make sure everything will fit but I have a couple questions.....

Does anyone know:

1. Can I re use my 850 exhaust pipes? I can’t find any info on the exhaust port sizes of the 850 vs 1000.

2. Can my 850 ECU be reprogrammed to run the 1000 since they both use the same ECU?

Any help would be appreciated.

THANKS!

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front diff mods.

has anyone made mods to there front diff to remove the all wheel on demand so when u engage the 4 wheel drive it,s instant and when in
4 wheel drive, the engine braking will work with the front wheel without going to ADC.

2009 sportsman 550 XP $3500

For sale local pickup new jersey 1923 miles, 252 hours , adult owned, front and rear storage compartments, custom stainless cooler rack (for beer of course), trailer hitch,heated grips and thumb throttle, all new wheel bearings, epi performance primary clutch spring, bike comes with owners manual, service manual and 5 extra ignition keys. Price is firm.

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2008 Polaris sportsman 500 Efi ho

hi guys new to the forum having serious problem with my sportsman first start of the day never mind what temperature it is very hard start and sometimes backfires and pops through Airbox. once it starts after 3 minutes of turning engine it cuts out on idle then i start again and runs for couple of seconds and cuts out and I keep trying and eventually stays running for longer maybe 3 to 4 mins on idle and cuts out again but really the hotter the engine gets the better it starts and runs on idle. but if you floor the throttle when it's running after getting it going it cuts out or splutters. I have a couple of videos taking off how it running and will do a cold start video tomorrow. any help greatly appreciated this bike has very little work done and hasn't being worked the last 2 years because nobody including Polaris dealer cant find the problem I fix a good few quad bikes myself but never Efi all carburated machines. so far the ecm has being changed throttle body fuel pump fuel filter spark plug and lead I also repaired wiring on engine temp sensor also. but the first time this bike came in to me and hasn't left 😤 but first thing I checked was spark and fuel was getting fuel but no spark changed the plug lead and got spark then changing this then we go back the long cranking untill it finally fires up and cuts out whenever it feels like it but runs alot longer when hot but still you hear the odd pop like it's going to shut off . it has fresh clean fuel all of the times iv tried it but also when I was changing the fuel pump which looked fine would I better to change the fuel pressure regulator. thanks in advance for help provided��

Vibration

Say i was wondering if any one else has had any problems with a lot of vibration on there machine i know this is a 1 cylinder .But it seems like there is a lot i have gone over all bolts can't seem to find any thing loose ?
Also were is the air mixture screw i thought maybe it is running to rich ?
Atv is 1 2000 4x4 325 magnum
i did try to up rpms to see if it smooth out but not any info would be great
thank you:nerd