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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 GEN8 valve spring is the best valve spring available today and 100% ISR legal for both Ice Oval and SnoX racing.

  • The GEN8 valve spring is the best valve spring available today and 100% ISR legal for both Ice Oval and SnoX racing. These are engineered to barely lose any performance after the first couple heat cycles where they lose about .012" in free length. After that they hardly change at all and many customers use the same valve springs for half to a full season. With the use of rev limiters it's now even more important to have good valve springs so you can get out front quickly because once the rev limiters kick in everyone is running the same speed theoritically.

High Performance Gen8 Valve Spring (pr)         $9.00       A18-0501

ISR Legal Polairs Valve Spring   

XL High Performance Gen8 Valve Spring (pr)         $9.00       A18-0506

Extra Long (XL) Polaris Valve Spring - These are the same as the above legal spring except these are ground to be slightly longer than the above spring. Since the springs lose about .012" free length in the first couple heat cycles, this allows a person to run them a couple times to get them through the initial heat cycles and then sand/grind the ends until they pass the max ISR spec. Then you have a spring that's at it's best and the longetivity keeps your performance at it's peek for many weekends of racing.   

Piston, Standard (Retail $159.99)                                                      $38.95       P-3086969

Piston Kit, .010" or .25mm (Retail $189.99)                                       $116.95       P-3086970K

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

Piston, .020" or .50mm (Retail $159.99)                                             $46.95       P-3086971

Polaris Ring Set, Standard (Retail = $94.99)                                              $39.95       P-3088203

Polaris Ring Set, .010" (Retail = $89.99)                               41.95       P-3088204

Polaris Ring Set, .020" (Retail = $84.99)                                                     $41.95       P-3088205

Polaris Piston Pin (Retail = $29.99)                                                          $8.50       P-3086546

Polaris Circlip (ea.) (Retail = $5.99)                                                          $0.60       P-3086553

Complete Polaris Gasket Kit (Retail $59.99)                              $47.95        P-0001001

Side Cover Gasket (Retail $27.99)                                            $8.99         P-0001002

Heavy Duty Rocker Arm (Retail $24.99)                                   $13.50        P-3087013

Rocker Cover Gasket (head gasket) (Retail $34.99)                       $7.00       P-3089528

Rocker (Valve) Cover Gasket (Retail $19.99)                                                 $8.00       P-3089529

Push Rod (Retail $34.99)                                                 $7.50       P-3086568

Exhause Valve (Retail $59.99)                                                 $27.99       P-3086566

Intake Valve (Retail $39.99)                                                 $17.99       P-3086565

Valve Guide (Retail $39.99)                                                $23.50       P-3086535

Valve Guide Plate (Retail $14.49)                                                $2.50       P-3086571

Collet Valve (Retail $9.99)                                                $1.60       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 $19.99)                                                $2.25       P-3086536

Pol Exhaust Gasket (Retail $4.99)                                                $4.00       P-3086574

Pol Oil Seal, Flywheel (Retail $44.99)                                                $10.50       P-3086510

Pol Oil Seal, Side Cover (Retail $39.99)                                                $9.50       P-3086516

Pol Crank Bearing, Flywheel (Retail $24.99)                                         $19.99       P-3086947

Pol Crank Bearing, Side Cover (Retail $29.99)                                         $19.99      P-3080108

Pol Pivot Bolt Nut (Retail $2.99)                                         $1.97       P-3084912

Pol Head Flange Bolt (Retail $6.99)                                         $5.99       P-3086526

Pol Connecting Rod Assy (Retail $154.99)                                         $81.00       P-3086544

Pol Connecting Rod Pivot Bolt (Retail $9.99)                                    $4.50       P-3086545

Pol Camshaft Assy (Retail $149.99)                                         $97.99       P-3086554

Pol Tappet (Retail $49.99)                                         $19.99       P-3086562

Pol Governor Rod (Retail $14.99)                                         $13.95       P-3086596

Pol Governor Return Spring (Retail $11.83)                                         $9.95       P-3086599

Pol Air Jet Adjuster (Retail $19.99)                                         $9.95       P-3086658

Pol Main Carb Nozzle (Retail $34.99)                                         $24.95       P-3086669

Pol Carb Jet Holder (Retail $39.99)                                         $24.99       P-3086675

Pol Carb Air Jet Spring (Retail $9.99)                                         $7.99       P-3086672

Pol Carb Rod Spring (Retail $19.99)                                         $14.95       P-3087145

Pol OEM Valve Spring Retainer (Retail $3.99)                          $3.50       P-3088206


Adjustable Main Jets and Pilot Jets

  • The adjustable main jet replaces the bolt that holds the bowl onto the carburetor and allows you to adjust the fuel flow. By changing the fuel flow you can fine adjust the engines peak peroformance as tempature and oxygen levels change throughout the day of racing.

  • We offer two different adjustable main jets for the Polaris 120s, both non-cable and cabled versions.

  • NON-CABLED: The non-cabled version is simply just the adjustable main jet that installs into the bottom of the carburetor.

  • CABLED: The cabled version has a cable that connects to the jet and can be routed to the top of the engine compartment so it's easier to reach and adjust. However, the cables that's used has memory and doesn't always stay exactly where you set it so caution to watch for this is advised.

  • PILOT JETS: We offer several sizes of pilot jets sold individually, and now offer a pilot jet kit. The pilot jet kit comes with #55, #57.5, #60, #62.5 and #65 for just $30.

Pol Adjustable Main Jet WITHOUT Cable                                       $39.95     A09-0071

Pol Adjustable Main Jet WITH Cable                                               $57.95     A09-0072

Pilot Jets                                   $7.50         

Pilot Jet Kit (55, 57.5, 60, 62.5 * 65)                                             $30.00     A09-0150

Click Picture to Enlarge   


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 and also fits the Arctic Cat and Yamaha with the Yamaha engine (2010 and newer).
  • TIP #1: Keep a fresh battery in the limiter. As the battery power lowers so does the maximum rpm the limiter will allow.
  • TIP #2: Do not buy from someone at the track. Most folks know that each rev limiter allows a different maximum rpm and you don't want to buy one that's been testing and found to have a lower rpm. When we receive these we immediately seal the bag for your security.
  • TIP #3: If you have a rev limiter and the switch fails, use an adjustable main jet to set 6850 max rpm. Do this buy adjusting rich and then lean the engine until the rpm reaches 6850 on your tach. It's not legal to keep it like this but it will get you through a weekend.

Polaris Rev-Limiter (All Model Years)




9v Battery Box for Rev Limiter

  • The battery box on the rev limiters are notorious for breaking or failing, so don't let yourself be caught ready to race and having to withdraw because you don't have a working rev limiter. These are cheap so be sure to have a couple in your toolbox for emergencies.

9v Battery Box

MSRP is $3.49




KOSO Mini 4 Tach


The Mini4 tachometer uses an LCD screen powered by an inner CR 2032 changeable battery that allows installation on any vehicle. With the small, compact and user‑friendly size, it is perfect for many applications. It also features a backlight, has a RPM display warning and also keeps track of your max RPM.

  • *** NEW 2022 ***

  • KOSO's mini RPM tach is a surface mountable Tachometer that is accurate to 20,000 rpms and features a resetable maximum RPM recall. This multifunction meter is programable to nine different firing patterns to accomodate two and four-stroke engines.
  • This tach is PERFECT for racing as it only has a 0.5 second delay between reading and display. Most mini tachs have up to five second delay.

  • This tach retails for $89.95, but is currently being offered by Olson brothers at a discount.

  • Measures 33.7mm (1.33 in.) H x 61.5mm (2.42 in.) W x 15.6mm (.61 in.) D

KOSO Mini RPM Tach                                           $74.95                 A16-0007   

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)                                            $2.95     A18-0004

Iridium Race Spark Plug (BPR6EIX)                                               $9.25     A18-0005

Click Picture to Enlarge   

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