2025 April 27th
Linked from Matryx FAQMY23 Snow Polaris Online Parts website
This is a very good overview of the MY23 Polaris engine lineup:
MY23 Polaris Engine overview & details
NOTE: Polaris uses the abbreviation 840T for the Patriot Boost engine. That is correct by cc displacement. Most of the members here (and Polaris) call the Patriot 840cc engine, the 850.
Brief Engine Specs:
Patriot 650 _ 650cc 74.8 Bore x 74mm Stroke
Patriot 850 _ 840cc 85 _Bore x 74mm Stroke
840T Boost_ 840cc 85 _Bore x 74mm Stroke Turbocharged
Patriot 9R___ 899cc 88 _Bore x 74mm Stroke
Section Titles:
- INTERNAL ENGINE COMPONENTS
- FLYWHEEL and ECU
- FUEL INJECTORS
- TURBOCHARGER, WASTE GATE, TUNED PIPE
- REED VALVE ASSEMBLY & REPLACEMENT PETALS
- VES Exhaust Valve Systems
- FUEL PUMP FLANGE ASSEMBLIES (PFA)
- Chaincase ratios for MY23 non-boost compared to MY23 Boost flatland sleds. Also "R" tracks & part numbers.
- BOOST & PROSTAR S4 4 stroke CLUTCH PARTS
- DRIVE BELTS
INTERNAL ENGINE COMPONENTS - - - - - - - - - - - - - -
2208236 Crankcase kit for MY19-23 650/850
2208236 Crankcase kit for MY22,23 840T Boost
.. Uses different Mag 5417863 SEAL-FLNGD 35X48X7,MAG HT,840T
.. and different PTO 5417255 SEAL-FLANGED,40X80X7,STDOFF,VT
2209827 Crankcase kit for 900(9R) has CNC machined intake & transfer ports to improve flow and power.
The MY23 650 2208740 crankshaft assemblies (which include connecting rods) still have the same part number, as those for MY21 & MY22. BUT they are also used in the MY23 900(9R) engine. (900 has lighter pistons than 850, so balance is the same). The 650/900 Crank has 3% less inertia than 850/840T.
The 850/840T 2208745 crankshaft assemblies still have the same part number, as those for MY21 & MY22, including Patriot Boost engines
ALL of the MY21up Matryx Patriot (650, 850, 840T, 900(R)) Crankshaft Assemblies have the same center crankweb pieces on either side of the center bearing:
5140941 MAG,
5140942 PTO
They also use the same Connecting Rods:
2208792 Connecting Rod Assembly 74ST FC & Wristpin Bearing.
THERE ARE ERRORS in the CRANKSHAFT DIAGRAMS, DON'T DEPEND ON THEM, AT THIS TIME
the 650/900 Crankshaft has lighter Outer Crank pieces:
5142849 Crankweb-74mm PTO
5142850 Crankweb-74mm MAG
The 850 and 840T have these Outer Crank pieces that are not numbered:
___ Crankweb-MAG, 74mm
___ Crankweb-74mm, PTO
new/different wrist pin and/or piston in the piston w/ring & pin kit, being used:
2209887 on the MY23 650 Patriot engines,
2209886 on the MY23 850 Patriot engines. non-boost
2209354 on the MY22-23 840T Turbocharged Patriot Boost engines.
2209829 on the MY23 900(9R) Patriot engines. (same wristpin bearing as 650/850/840T) but 9R pistons have white Ceramic coated domes, lighter weight than 850/840T (same weight as 650 piston and pin).
3023610 are the 74.8mm cylinder heads for MY21-23 650 engines
3023282 are the 85mm cylinder heads for MY21 850 engines
3023283 are the 85mm cylinder heads for MY22-23 850 engines (higher compression)
3023976 are the 85mm cylinder heads for MY22-23 Boost 850 engines.
3023980-751 88mm blue cylinder heads for MY23 900(9R) engine.
5411044 inner O-RING-3.239X3.379X.07,H-TMP for 650 Patriot
5417079 outer O-Ring 114.02mmX1.78mm for 650 Patriot
5411675 inner cylinder head O-RING,3.625X3.765X.07,HI-TMP for 850/840T/900(9R) Patriot
5411359 outer cylinder head O-RING,4.739x4.879x.07 for 850/840T/900(9R)
3023607 650 CYLINDER-74.8mm is used on all MY21-23 650 engines
3023433 850 CYLINDER-85mm is the same part number for all MY19-MY23 850/840T
3023972 900 CYLINDER-88mm is used on MY23 900(9R). It has new enhanced plating process, AND CNC machined transfer ports and exhaust improved at snout to improve flow and power.
---
FLYWHEEL and ECU - - - - - - - -
This summarizes information from 850Switchback, ExcursionPSD and others...
The High-Resolution ignition and Engine Management system used on some Mountain sleds for MY22, is rolling out in MOST of the MY23 flatland sleds.
More accurate flywheel positioning data supports better injector event & spark timing.
A new High Resolution Flywheel: 4019967 FLYWHEEL-PBR,21T-3T was used on Matryx Mountain sleds in MY22, and on MY23-26 Matryx 650/850/840T. This is verbally called the "21 minus 3 tooth" flywheel, I think to distinguish it from the simple 18 tooth flywheels.
The MY23-25 900(9R) & MY25 600 Cross Country uses a similar high resolution flywheel, but the part number is 4080622 FLYWHEEL-PBR,21-3T,LW. It is 10% lighter in weight, than the 4019967 Flywheel. Lighter flywheel weight allows quicker engine response to throttle
MY26 900(9R) use a lightweight flywheel: 4083021 FLYWHEEL-PBR,21-3T,LWT.
MY22 mountain & MY22-25 Boost & MY25 600 CC sleds have a 4019295 ECU used with the 4019967 High resolution flywheel.
MY23-26 Matryx 650/850 NA/900 sleds, without Boost, use 4080749 ECU-BASE, KOK, NA. The faster chip in the ECU will process the more precise data quicker to respond to changes and make adjustment as needed. Improved throttle response and cleaner running.
The same 4017454 Stator is used in all MY23 650/850/850T/900(9R) engines, as in the other MY21/22 Matryx 650 & 850 Patriot engines.
With very fine identification of the position of the flywheel, AND a high performance ECU, calculations about fuel flow and Ignition timing, can be made at the last possible moment. This is more significant on a boosted engine, where pressure at the intake manifold is changing quickly and often.
Here is a table of the flywheel and ECU part numbers for the last few years 650 and 850 sleds:
| Model Year | Fly- wheel | ECU Part# | Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
|---|---|---|---|
| 4017455 | FLYWHEEL-PBR,RE,119MM (Standard Resolution) | ||
| 4019967 HR | Flywheel-PBR,21T-3T (High Resolution) | ||
| MY23 900 | 4080662 HR LW | Flywheel-PBR,21T-3T,LW (High Resolution LightWeight) | |
| 4083021 HR LW | FLYWHEEL-PBR,21-3T,LWT (High Resolution LightWeighT) | ||
| 4018714 | ECU, KOK, 840T (MY20up 850 Axys) | ||
| 4019066 | ECU-BASE,KK,840,21 (MY21 Matryx, MY22 Matryx flatland) | ||
| 4019295 | ECU-BASE,KOK,840T,MY22 (Matryx Mountain, all) ... MY23 Matryx Boost Mountain | ||
| 4080749 | ECU-BASE,KOK,NA (MY23 Matryx flatland without Boost) | ||
| Flywheel ECU pair usage | |||
| MY19 | 4017455 | 4018714 | -850 Patriot All |
| MY20 | 4017455 | 4018714 | -850 Patriot All |
| MY21 | 4017455 | 4018714 | -850 Axys All |
| MY21 | 4017455 | 4019066 | -650 & 850 Matryx All |
| Model Year | Fly Wheel | ECU Part# | Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MY22 | 4017455 | 4018714 | -850 Axys flatland all |
| MY22 | 4017455 | 4019066 | -650 & 850 Matryx flatland |
| MY22 | 4019967 HR | 4019295 | -MY22 Matryx Mountain 650, 850 & Boost |
| Model Year | Fly Wheel | ECU P art# | Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MY23-26 | 4019967 HR | 4080749 | -650/850 Matryx all w/out Boost |
| MY23-26 | 4019967 HR | 4019295 | -840T Matryx Boost |
| MY23-25 | 4080622 HR, LW | 4080749 | -900(9R) Matryx |
| MY25 | 4080622 HR, LW | 4019295 | -600 Cross Country (4 injectors) |
| MY26 | 4083021 HR, LWT | 4080749 | -900(9R) Matryx |
---
FUEL INJECTORS
4017536 Fuel Injectors w/lead MY19-23 650,850 NON-Boost, 900(9R)
4019294 Fuel Injectors w/lead 840T. MY22-23 Matryx Boost
. 4019946 Auxiliary (throttle body) Fuel injectors w/lead 840T. MY22-23 Matryx Boost
4014242 Fuel Injectors w/lead MY22-23 600 Indy Cross Country 136
----------- and some Axys 600,800 sleds.
4014715 Fuel Injectors w/lead MY15-23 some 600 Axys, 800 Titan.
---
TURBOCHARGER, WASTE GATE, TUNED PIPE
--------- ALL MY22-23 Boost flatland or Mountain
1206259 Turbocharger Assembly w/oil lines 840T
1263560 Wastegate Assembly 840T
1208816 Wastegate Actuator + Flex Drive 840T
1263492 ASM-Tuned Pipe (end outlet to Turbocharger,
-----------and center outlet to Wastegate. 840T)
1263493-029 Resonator (Muffler) Black 840T
-----------Inlets from: Wastegate bypass tube, & Turbocharger mount
NON-BOOST EXHAUST PARTS
1263307 ASM-Tuned Pipe MY21-23 650
1263067 ASM-Tuned Pipe MY19-23 850
1263700 ASM-Tuned Pipe MY23 900
1263068-029 Resonator (Muffler) black. MY19-23 650/850/900(9R)
---
REED VALVE ASSEMBLY & REPLACEMENT PETALS
| Year | cc | part # | Part Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
|---|---|---|---|
| MY21 | 650 | 1206267 | ASM-REED VALVE |
| MY21 | 650 | 2208584 | K-REED PETALS 650 [SVC KIT FOR ONE REED VALVE] |
| MY22, 23 flat & Mountain | 650 | 1208683 | ASM-REED VALVE,650 |
| MY22, 23 flat & Mountain | 650 | 2209031 | K-REED PETAL,650 [SVC KIT FOR ONE REED VALVE]ASM-TB ADAPTER,W/REED,VBAND |
| MY21-23 Matryx flat &Mountain | 850 | 1206265 | Reed Valve Assembly |
| MY21-23 Matryx flat &Mountain MY19up Axys | 850 | 2207948 | K-Reed Petals 850 [SVC KIT FOR ONE REED VALVE] |
| MY22-23 All Boost | 840T Boost | 1206250 | ASM-TB ADAPTER,W/REED,VBAND NOTE: Vband is metal clamp to secure Throttle Body to flange on Reed Valve Adapter |
| MY22-23 All Boost & 900 | 840T/900 | 1208721 | ASM-REED VALVE, .57/.57, Reed Petal Assembly |
| MY21-23 All NON boost | 650/850/900 | 5417450 | REED Valve Adapter Only |
---
VES Exhaust Valve Systems - - - - - - - - - - - - - -
The MY21up Matryx 650/850 Patriots do not use the same E-VES system that the earlier 800 & 850 sleds with E-VES used.
All MY21up Matryx 650 & 850, use a Non Smart Valve VES system, where the ECU directly controls the Non Smart Exhaust valve actuator. They have 25% faster valve actuation.
Starting with MY15 ALL AXYS/TITAN 800's and 850's used a Smart Valve system where the ECU gives commands to the Smart Actuator, and the 800s use a PWM to Analog signal convertor. The Smart Actuator works out how much movement is necessary to achieve the desired position, and then sends success/failure codes to the ECU.
-
4014355 ACTUATOR, EV-SMART (MY15-23 AXYS/Titan 800)
4016933 ACTUATOR, EV-SMART GPA (MY19-22 AXYS 850)
4018736 ACTUATOR, EV-NON SMART (MY21-23 Matryx 650/850/840T/900)
5143539 Tiebar-ExhValve Mach is used by MY21-23 650/850/840T/900
1208701 Exhaust Valve Base used on MY19-23 650/850/840T/900
5416132 SEAL-BASE,CYL EXH VALVE on MY19-23 650/850/840T/900
7044014 SPRING, EV, UPPER on MY15-23 650/800/850/840T/900
5144090 VALVE-GUILLOTINE,EXH,UPPER,MCH on MY23 900
5144089 VALVE-GUILLOTINE,EXH,LOWER,MCH on MY23 900
---
FUEL PUMP FLANGE ASSEMBLIES (PFA)
All 650 engines use a 45psi regulated PFA. The 850, 840T and 900 use a 60psi regulated PFA
2209834 K-FUEL PUMP 850 RMK only used on MY23 850/900 Mountain.
2209838 Fuel Pump Assembly (PFA) only used by MY23 turbocharged Patriot Boost FLATLAND
2209835 K-FUEL PUMP 840T RMK INCLUDES FUEL PUMP, FILTER, PFA GASKET,3,11 only used by MY23 840T Turbocharged Mountain.
---
Chaincase ratios for MY23 non-boost compared to MY23 Boost flatland sleds.
Also "R" (Race/high speed) tracks & part numbers. - - - - - - - - - - -
| Model | sprocket -chain ratio | Track #Part Number - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
|---|---|---|
| MY23 VR1 850 129 | 23:37-68 1.61 | 1.352" Cobra 129 #5416604 |
| MY23 VR1 Boost 129 | 23:37-68 1.61 | 1" Ripsaw II R 129 #5418184 or 1.352" Cobra R 129 #5418185 |
| MY23 VR1 850 137 | 22:37-68 1.68 | 1.352" Cobra 137 #5413661 |
| MY23 VR1 Boost 137 | 23:37-68 1.61 | 1" Ripsaw II R 137 #5418186 or 1.352" Cobra R 137 #5418187 |
| MY23 850 Switchback Assault 146 | 23:40-70 1.74 19:40-68 2.11 | 1.352" Cobra 146 #5417323 2" Crossover (NOT R) #5417325 |
| MY23 Boost Switchback Assault 146 | 23:40-70 1.74 19:40-68 2.11 | 1.352" Cobra R 146 #5418188 2" Crossover (NOT R) #5417325 |
BOOST & PROSTAR S4 4 stroke CLUTCH PARTS - - - - - - - - - - - - - - - - - - -
| Model | P22 Prim. Spring | Primary weights | TSS-04 Secondary Spring | TSS-04 Secondary Helix | Notes - - - - - - - - - - - - - - - - - - - |
|---|---|---|---|---|---|
| MY22 Boost RMK Khaos Slash 155 MY22 Boost RMK Pro 165/163 | 7045965 165/310 | 1327227 14-78 | 7043363 Black/Purple LH | 5144320 64/44 .40 BAE ER | |
| MY23 Boost RMK Khaos Slash 155 MY23 Boost RMK Khaos Slash 165/163 | 7045965 165/310 | 1327226 14-76 | 7043363 Black/Purple LH | 5144853 46S BAE ER | |
| | | | | |
| MY23 Patriot 9R Mountain 163/165 | 7043829 140/330 | 1327230 14-80 Lo 14-72 Hi | 7043363 Black/Purple LH | 5144848 60/42 Lo .36 BA35 ER 5144803 56/42 Hi .36 BA35 ER | |
| MY23 Boost VR1 129/137 MY23 Boost SBA 146 | 7045965 165/310 | 1327230 14-84 | 7043063 Black LH | 5144849 58/46 .36 BA35 ER | |
Prostar S4 1000cc 4 stroke | P22 spring | P22 weight | Boss Spring | Boss Sheave ramps | |
| MY23 Prostar S4 INDY XC 129/137 Adventure 137/X2 Nordic Pro 146, Voyageur 146 | 7044504 58/120 | 1327216 15-76 | Boss Team 7045922 180/240 | Boss Team Movable Sheave 273/42 STRT | |
| MY23 Prostar S4 Titan | 7045869 55/155 | 1327216 15-76 | Boss Team 7045922 180/240 | Boss Team Movable Sheave 273/42 STRT |
DRIVE BELTS - - - - - - - - - - - - - - -
== 10.625" Clutch Center to Center Distance
3212325 BELT-DRIVE 10.625CD N8E 14 DEG (use with P22 primary)
. Used by MY23 Boost VR1 129/137, Boost SBA 146 and Prostar S4 4 stroke Titan 155
3211215 BELT-DRIVE 10.625CD
. Used by MY19-23 Flatland 800 & 850 sleds including Titans, not used on Boost.
3211165 BELT-DRIVE 10.625CD CVT MBL MID
. Used by MY15-21 Axys 600 flatland sleds, MY21-23 650 Matryx flatland, MY23 Prostar S4 129 & 137 & 146.
== 11.5" Clutch Center to Center Distance
3211216 BELT-DRIVE, 11.5CD
. Used by MY19-23 850 Mountain Machines, including MY22-23 Boost RMKs & MY23 9R (900) RMKs
3211115 BELT-DRIVE, 11.5CD,CVT MBL
. Many different 600/700/800 MY05-15, MY16-21 Axys 600 Mountain, MY22-23 Matryx 650 Mountain.
3211183 BELT-DRIVE, 11.5CD
. Used by MY16-19 Axys 800 Mountain
