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Kitty Cats

Polaris 120

Arctic Cat 120

Ski Doo 120




Favorite Links:

>Kids Pro Ice West

    NW MN & E. ND



    Northeast MN


>WI Kitty Cat Racers



>WI Kids Snowmobile

    Racing Association

    Northern WI


>Michigan SnoX

    All MI


>Rock Maple Racing

    Northeast USA


Other Links:


    Message Board






Polaris Engine


Mychron Light Tach

Spark Plugs



Polaris 120 Engine Parts


  • There will be more engine parts listed as I have time to add them.  Thanks for your patience.

  • The GEN5 valve spring is the best valve spring available today and 100% ISR legal for both Ice Oval and SnoX racing.

  • The "blue tinted" valve spring has a slightly tighter coil which is not ISR legal, but accepted in most snoX venues.

  • The OEM valve spring is exactly that, and not many customers buy these when you can get the others for 1/4 the price.

** NEW 2019** High Performance Gen8 Valve Spring (pr)         $9.00       P-3086563-G8   

SnoX Valve Spring (pair) (Blue tinted spring)                                   $5.00       P-3086563-B   

These springs are great, but they don't last as long as the Gen7 springs.

OEM Valve Spring (each) (27mm ~)                                                   $20.00       P-3086563

Piston, Standard (Retail $107.79)                                                      $29.95       P-3086969

Piston, .010" or .25mm (Retail $102.49)                                            $44.95       P-3086570


Piston Kit, .010" or .25mm (Retail $122.79)                                       $79.95       P-3086970K

Kit Includes: Piston, Rings, Piston Pin, & Circlips

Piston, .020" or .50mm (Retail $108.99)                                             $36.95       P-3086971

Polaris Ring Set, Standard (Retail = $87.99)                                              $29.50       P-3088203

Polaris Ring Set, .010" (Retail = $71.79)                               31.95       P-3088204

Polaris Ring Set, .020" (Retail = $69.99)                                                     $31.95       P-3088205

Polaris Piston Pin (Retail = $23.79)                                                          $6.00       P-3086546

Polaris Circlip (ea.) (Retail = $4.29)                                                          $0.45       P-3086553

Complete Polaris Gasket Kit (Retail $37.95)                              $27.95        P-0001001

Side Cover Gasket (Retail $17.27)                                            $6.95         P-0001002

Heavy Duty Rocker Arm (Retail $16.49)                                   $12.99        P-3087013

Rocker Cover Gasket (head gasket) (Retail $22.79)                       $6.00       P-3089528

Rocker (Valve) Cover Gasket (Retail $14.49)                                                 $6.00       P-3089529

Push Rod (Retail $26.79)                                                 $6.25       P-3086568

Exhause Valve (Retail $51.99)                                                 $19.95       P-3086566

Intake Valve (Retail $28.79)                                                 $12.95       P-3086565

Valve Guide (Retail $28.79)                                                $16.95       P-3086535

Valve Guide Plate (Retail $11.29)                                                $1.00       P-3086535

Collet Valve (Retail $6.29)                                                $1.10       P-3086567

NGK Rubber Plug Cap (Retail $7.89)                                                $5.95       TB05EMA

NGK OEM Plug Cap (Retail $7.99)                                                $5.99       3003-175

Pol Woodruff Key (Retail $13.49)                                                $1.95       P-3086536

Pol Exhaust Gasket (Retail $2.95)                                                $1.75       P-3086574

Pol Oil Seal, Flywheel (Retail $33.99)                                                $10.50       P-3086510

Pol Oil Seal, Side Cover (Retail $28.99)                                                $9.50       P-3086516

Pol Head Gasket (Retail $22.79)                                                $6.00       P-3089528

Pol valve cover gasket (Retail $14.49)                                                $6.00       P-3089529

Pol Side Cover Gasket (Retail $17.27)                                                $6.50       P-0001002

Pol Crank Bearing, Flywheel (Retail $19.95)                                         $18.85       P-3086947

Pol Crank Bearing, Side Cover (Retail $19.95)                                         $18.85       P-3080108

Pol Pivot Bolt Nut (Retail $2.95)                                         $1.97       P-3084912

Pol Head Flange Bolt (Retail $4.29)                                         $3.49       P-3086526

Pol Connecting Rod Assy (Retail $95.88)                                         $59.25       P-3086544

Pol Connecting Rod Pivot Bolt (Retail $4.65)                                    $4.50       P-3086545

Pol Camshaft Assy (Retail $90.19)                                         $89.27       P-3086554

Pol Tappet (Retail $31.16)                                         $17.43       P-3086562

Pol Governor Rod (Retail $7.79)                                         $6.95       P-3086596

Pol Governor Return Spring (Retail $11.83)                                         $11.19       P-3086599

Pol Air Jet Adjuster (Retail $11.83)                                         $9.95       P-3086658

Pol Main Carb Nozzle (Retail $20.36)                                         $19.95       P-3086669

Pol Carb Jet Holder (Retail $23.96)                                         $17.36       P-3086675

Pol Carb Air Jet Spring (Retail $5.74)                                         $4.90       P-3086672

Pol Carb Rod Spring (Retail $8.68)                                         $7.29       P-3087145

Pol OEM Valve Spring Retainer (Retail $6.80)                          $3.50       P-3088206


KOSO Rev Limiters (ISR LEGAL)

  • As of the 2014/15 season, rev-limiters are now required to be used on all stock 120 class races. These KOSO rev-limiters restrict the maximum RPM to 6850 and are the only ISR approved rev-limiter devices.
  • This rev-limiter uses a 9 volt battery for power so there is no power required from the snowmobile itself.
  • A very simple three wire hook up to install.
  • This rev-limiter is for the Polaris 120. The Arctic Cat and Yamaha are different.

Polaris Rev-Limiter (All Model Years)

Temporarily Out of Stock

There's a problem with Rev Limiters in that when they became required by ISR they were available from most manufacturers. However, all manufactures have discontined them and now Rec Motors is the only company that can buy these from KOSO. Because of this and the fact that KOSO can't get more made at this time, NOBODY has them in stock except for a small number left at Rec Motors in which other dealers can't buy from at this time. Since there is an ISR rule that states that products are not supposed to be 'single sourced', this is clearly an issue. If you can't get a rev limiter, you need to bring this complaint to ISR.




KOSO Mini RPM Tach (with recall)

  • This meter can be easily install on about any engines. Just wrap the RPM signal wire around your spark plug wire, set the number of cylinders… that’s it, you’re ready to go!

  • Memory recall of highest RPM since last reset!
  • Display range : 0~15,000 RPM
  • Display speed : <0.5 second
  • RPM input pulse : 0.5,1,1.5,2,2.5,3,4,5,6
  • Battery type : CR 2032
  • Battery life : 1000 Hours
  • Size : Width = 2.4" x Length = 1.3" x Height = 0.6"

KOSO Mini RPM Tach



Click Picture to Enlarge   


Spark Plugs

  • Standard and Iridium NGK spark plugs for Kitty Cat and all 120cc sleds. Order on-line or call 651-485-3771.

  • Iridium plugs last longer and have more spark surface for better fuel ignition.

  • E3 plugs are designed for high performance engines and have a diamond shaped electrode for greater spark.

Standard 120cc Spark Plug (BPR6ES)                                            $2.90     NGK-BPR6ES

Iridium Race Spark Plug (BPR6EIX)                                               $9.25     NGK-BPR6EIX

Click Picture to Enlarge   

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