UpShift403 Polaris Big Bore 1000

We love the Polaris Patriot 850 and 9R platforms. They’re already leaders in top-end power, but we knew they could deliver more where it really counts — the bottom-end and midrange grunt for deep snow domination. Inspired by the legendary mid-2000s big bores, the 1000cc Stroker Kit brings back that aggressive torque curve, delivering a crisp hit from a standstill and serious pull through the entire powerband. When you install twins on a 9R/850 a few comment they feel a little less snort when you punch the throttle.  You will not be debating the old twin pipe theories with any of our big engine kits.

With a gain of 45 HP from start to finish over stock 850, this is the smallest of our big bore kits — but arguably the most special. Based around the M1000 piston and designed with both naturally aspirated (NA) and Boosted applications in mind, the 1000cc Stroker is your go-to upgrade if you’re looking for unmatched throttle response and brute force power.

What’s included in the Kit?

•  Indy Specialty Bad Ass Billet crankshaft with custom billet rods featuring their proven triple wide PTO bearing setup.  This crankshaft does not flex and PTO bearings do not move around in case – they press fit to crankshaft – $4478.00
•  Cast Big bore cylinder 96mm bore – $2800.00
•  Billet head c/w domes & new bolts & billet water fittings – $840.00
•  2X Cast Piston kits –  $520.00
•  Top End Gasket Kit – $98.50
•  2X piston pin bearing – $100.00
•  Stainless coated base gasket – $38.00
•  New Primary and Secondary Power Valves to match cylinder – $400.00
•  Bigger Injectors with harness – $269.00

Total Value: $9,883.50 CAD

Package Price: $8,500.00 CAD

Crankcase Machining Options:

While the kit can technically run without crankcase machining, it is highly recommended machining during crank install to ensure peak reliability and performance:

• Transfer port case-matching
• Locating ring machining for triple bearing (can Loctite if not machining)
•  Add gas/oil mix passages to PTO and MAG bearings — factory blanks these ports and relies solely on direct oiling
  
  *Ask us about exchange crankcases — core return required.*

Optional Add-Ons:

• Oil injection delete kit for lightweight builds

• 52mm or 60mm Big Bore Throttle Bodies with injector relocation and custom reed valve adapters

• Fuel Inserts:
  – Pump Gas Insert
  – 100 Octane Insert
  – Race Inserts (110–120 Octane)

• SLP Twin Pipes

Got Boost?

The 1000cc kit was designed with aftermarket turbo and factory boost applications in mind.

Why Choose UpShift403’s Kit?

• Proven crankshaft durability with Indy Specialty billet design

• Engineered for peak performance in deep snow

• Pulls harder and longer than any modified 9R on any gas

• Thoughtfully designed for aggressive backcountry riders, flat land speed demons and racers of all kinds