Polaris 850, 900r and 929 bigbore, & 970 Performance ! also 650's

Polaris AXYS 650, 850 & 900 PERFORMANCE, BIGBORE, TUNING KITS and EXHAUST.

The best engine and exhaust components in the industry for the new Polaris 650, 850 and 900 twin.

We had our products ready in 2018 before the sleds hit the showrooms.

126 MPH in 1500 ft! 114 mph in 1000 ft, and 105 mph in 660ft with Terra Alps 850 full performance kit with big wheel kit and drivers. Pump gas!

850 PERFORMANCE KITS - We have a wide range of tuning for the 850. ECU flash tunes for your stock sled with stock exhaust and with muffler. Then can step it up with billet head, high flow Y pipe, pipe, twin pipes, porting, big bores...

Reflash ecu capabilities to get better running conditions and HP gains. Designed from a 2 stroke specialists, years designing and testing all parts.

Highflow Y pipe, billet head, and ecm reflash  $1900 cdn. Great package and great HP improvements.

This kit RIPS! gets the 850 working like it should, better throttle response and noticeable acceleration and top end charge!

 gained 6 mph on top end with RMK 155 850.

Clutching is needed as were making POWER! Clutching available.

Primary clutch weights, springs and helix and shims.

We tested with just adding weight to primary clutch and also seen more gains with our custom helix.

Want more? add complete porting package to take your power gains to the next level.

Porting $800 cdn or $570 us approx. Get Some airflow going thru your engine and make HP

Case porting recommended with cylinder porting $200 cdn

We have 10 years+ on the Terra Alps 909 Big bore! Already proven in our 800 AXYS bigbore stroker kit. 190+ hp.

This experience relates to the new current 74 mm stroked engines.

850 PRO STOCK , IMPROVER RACE engines ! call or email for more info on a build.

-900R PERFORMANCE KITS - 2023' and current 900r models,  ECM flash tunes, porting, billet heads, high flow Y pipes, mufflers, clutching...

FULL RACE KITS , PRO STOCK , IMPROVERS  call or email for info on a build.

-929 BIGBORE, you wanted something bigger, thats what we thought! 

Kit includes boring, welding and modify, changing port shapes, porting and replating of your cylinder, after plating report  and custom hone. Kit comes with 2 piston kits, billet head with domes  to run pump gas at your riding area, exhaust valves get machined for proper opertion.

Send in your cylinder, cases and exhaust valves complete. $3695 cdn. or $2600 us approx.

To build your 850 to the 900 cc big bore using the factory pistons $3795 cdn or $2650 us. approx.

High flow Y pipe $399 recommended , ( 9r y pipe not recommended! )

Single pipe $799 cdn.

Muffler Narly trail $449 cdn. 

TWIN PIPES ! $2295 cdn

ECM reflash $749 cdn.

Light weight crankshaft modification, Have an 850 crank and want the 900r lightweight crank? We can do that. $600 cdn. 

STROKER BIG BORE 970cc engine kit!  $6500 plus cdn or $4400 us approx depending on the build, Call for info !

650cc PERFORMANCE KITS -  Billet head, PORTING, high flow Y pipe, ECU reflash, Big bore to 700 or 850 or 900 or 929!

                                        650 improver, 700 improver, and pro stock class race engine kits

BILLET HEAD with interchangeable domes, gain up to 7 hp + . Gained 250-300 rpm in testing over stock head with our pipe mod. $799 cdn. or $580 us approx.

Multiple Compression ratios available for your riding area with pump gas, high elevation riding, race set up and turbos.

Set up for your 850's timing curve and exhaust pipe.

HIGH FLOW Y PIPE  $399 cdn. or $280 us. High flow for our big bore kits.

SINGLE PIPE CUSTOM   $799 cdn.

with muffler $1195 cdn.

Stock pipe mod, gain top end HP and no fade on long pulls without losing mid range power like other pipe mods. $299 cdn.

Send in stock pipe with heat shield is ok. We will put it back on.

MUFFLERS - Narly trail lightweight and highflow for our bigbore kits that need to flow more cfm. $449 cdn.

Mtn Narly edition Deep Raunchy sound, but not ear bleeding saves over 11 lbs $399 cdn. or $290 us approx.

Stock 850 muffler is 16 lbs.

Cooking Muff pots available on Mufflers on request. $79.95

TWIN PIPES $2199 cdn. For Race, trail or mountains! call for info.

CRANKSHAFT rebuilds , modifcations and stroking - call or email for more info

HISTORY - Terra Alps Racing (TED) designed the 840 stroker and the 900 big bore stroker off the 800 base engine in 2015' 

              Polaris caught the idea of this engine and started building prototypes. They finished up with a 840 stroker (850) in 2018'

              Early 2018' Polaris sent a prototype to Terra Alps Racing for future design work. We designed the 929 big bore kit. Released in Sept 2018'