THIS COMBO HAS WON CHAMPIONSHIPS, RACES, AND IMPRESSED MOUNTAIN RIDERS PAST SEASON

So much damn torque, you will leave trenches in the tundra!

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.

Key Features

• HP UPDATE - Up to 215 HP with 60 mm Throttle Body
• “For those who insist on a cast piston”
• Stroker kit includes the same 78mm billet crankshaft and billet rods used in our 1150 kit
• Built around the  M1000 piston
• Compatible with both boosted and naturally aspirated setups
• Tunes available for stock injectors and TB, 54mm TB and 60mm TB

Option for:
  - 54 x 52mm throttle body with injector relocate
  - 60mm big bore throttle body with injector relocate

• Pump gas compatible — not our favorite, but it’s doable
• Compatible with SLP Twin Pipe Kit
• Single Pipe Kit

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, we highly recommend 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

• 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

• Big Bore Single Pipe Kit 

Got Boost?

The 1000cc kit was designed with aftermarket turbo and factory boost applications in mind. Be sure to check our Big Bore + Boost Q&A pages for more details on compatibility and tuning setups.

Why Choose Our 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

Need help comparing more to a 900?  We are here to answer your questions, overthinkers welcome!

International Orders - FOB Shipping Terms

All international shipments are sent FOB Origin (Canada).  Ownership and responsibility transfer to the buyer once the shipment is handed over to the carrier. 

Upshift403 is not responsible for customs delays, import restrictions, duties, tariffs, taxes, brokerage fees, or other charges imposed by the destination country. These costs are the sole responsibility of the customer.

Shipping, Duties, and Refused Deliveries

Customers are responsible for all shipping costs, duties, tariffs, taxes, brokerage fees, and any other charges associated with their order.

If a shipment is refused, abandoned, or returned due to non-payment of duties, tariffs, taxes, brokerage fees, or failure to accept delivery, the customer will be responsible for:

• All original shipping charges

• Any return shipping charges

• Any customs, duties, tariffs, brokerage, storage, or handling fees incurred

• Any additional fees charged to Upshift403 by the carrier or customs authorities 

These charges will be deducted from any approved refund. If the charges exceed the value of the refund, the customer remains responsible for the outstanding balance.

No refund will be issued until the returned shipment has been received and all associated fees have been assessed.

Refund Policy

Refunds are considered on a case-by-case basis. If you wish to return an item for any reason, please contact us directly to discuss your request.

All approved refunds are subject to a 10% restocking fee due to Shopify fee applied to refunds. Original shipping charges are non-refundable, and return shipping costs are the responsibility of the customer unless otherwise agreed upon.

We appreciate your understanding and will do our best to ensure your satisfaction.