HARD RACING PERFORMANCE
  L.L.C. 
&  HARD CORE SPORTS   L.L.C.   
    264 Rolling Hill Rd.  Mooresville, NC  28117  -  704-799-2192

 

UTV Misc Engine Parts
 

Holz Brand  RZR, RZR-S, RZR-4 Performance Cam & Valve Train Kit  Fits 2008-2010 Models 

Kroyer Racing Engines Polaris Performance Cam & Valve Train Kit.
Designed to fit the stock head/valve configuration.
Performance Valve Train Kit for Polaris RZR, RZR-S, RZR4 and Sportsman 800 motors. Provides increased overall performance and reliability for safe engine RPM’s up to 7000.
Replace that lazy, stock cam and valve train with the Kroyer Racing Engines Valve Train Kit; Race proven Performance. Some companies just sell a cam - We insist on selling a complete kit as opposed to individual parts because the stock valve springs, lifters and push rods are not adequate to operate with a higher lift/ duration camshaft or higher RPM and it is important for the performance and reliability of the motor that all parts be replaced/upgraded at the same time. It is also important that all valve train parts be designed to the same specification (by the same company) to ensure precise and correct fitment and function.
(Parts not sold separately)
Kit Includes
-Pushrods
Lighter one piece design made from a heat treated alloy allows less deflection.
-Hydraulic Lifters
Better quality. Designed to work with KRE Valve Train Kit.
-Cam Shaft
Exclusive profile design is CNC ground. Increased lift and duration. Increased power throughout entire RPM range.
*No core required for cam.
-Valve Spring Kit
Designed and built to exact tolerances from special high tensile strength alloys for proper length, rate and strength. Ensures proper valve operation throughout entire RPM range and especially at higher revs. Includes springs, bases, and lightweight retainers.
Also included...
- Gasket Kit (head, base & ign. cover)
- 2 Quarts Joe Gibbs Break-in oil and Oil filter
- Assembly lube
Designed to work with stock Polaris head/valve configuration.

Model: 618004       Sale Price:$799     
             Call (704-799-2192) or Email for Shipping Quote
Holz Brand  RZR Performance Valve Spring Kit for O.E. Head/Valves

KROYER RACING ENGINES POLARIS VALVE SPRING KIT (stock head) RZR 800
Valve springs play a key role in the proper operation of your engines valve train. In order to function correctly, the valve spring must be of proper length, rate and strength in order to allow the valves to effectively follow the profile of the cam with out any loss in power throughout your engines entire RPM range. A spring that is too soft or too stiff will not allow for consistant cam and valve timing resulting in loss in performance or even worse…
The Kroyer Racing Engines valve spring kit was designed and built to exact tolerances from special high tensile strength alloys.
Kit includes:
- Springs
- Bases
- Light Weight Retainers
Valve Spring Kit is intended to be used with a higher lift/duration ‘aftermarket’ camshaft and stock Polaris cylinder head and valves.

Model: 618003   Sale Price:$274
Holz Brand  RZR Big Bore Replacement Piston Kit, 787cc (81.5mm) 11:1 comp

Kroyer Racing Engines 81.5 mm Big Bore CP Piston Kit for Polaris RZR,
(also fits Sportsman 800 Motor).
Your stock Polaris motor is only 760cc. These big bore pistons will increase the bore size from a mere 760cc to 787cc for increased power and torque.
Pistons designed exclusively by Kroyer Racing Engines, manufactured by CP Pistons and distributed solely by Holz Racing Products.
Piston Features
Each big bore piston is exclusively designed by Kroyer Racing engines and machined from designated forgings on a state of the art 5-axis machine and is 45 grams lighter than the OEM pistons and 5 grams lighter than the closest competitor’s pistons.
- Dry Film Lubrication Coating on piston skirts for increased longevity and reduced friction.
- Oversized Valve Pockets designed to work with oversized valves.
- WPC hard treated wrist pins for extreme durability.
- Double Pin Oilers provide twice as much lubrication to the wrist pin.
- Anti Detonation Grooves limit the piston/cylinder contact during high temp and RPM.
- Accumulator Groove collects excess blow by and residual gases during combustion and alleviates top ring flutter while increasing ring seal.
- X-Forging. This design enables the use of a shorter pin for added strength and overall weight savings.
- Optimized Cam and Barrel= Tighter clearances; Less noise; Better ring seal; More power; Increased durability.

Each Kit includes 2 pistons with rings, wrist pins and circlips
Designed to run on 91 octane pump fuel – Will work with stock head and valve train, but are designed to work with Kroyer Racing Engines head and valve train upgrades.
• Requires boring and re-plating cylinder

Model: KR815110      Sale Price:$539.95
Holz Brand  RZR Stock Replacement Piston Kit, 760cc (80mm) 11:1 comp

Kroyer Racing Engines O.E. Replacement 80mm 11:1 CP Piston Kit.
80mm Bore Stock-Replacement Pistons For Polaris RZR, (also fits Sportsman 800 Motor). For increased performance and more reliability, use these high quality stock replacement pistons when you freshen-up or rebuild the top end of your RZR.
Designed exclusively by Kroyer Racing Engines, manufactured by CP Pistons and distributed solely by Holz Racing Products.
Piston Features
Each piston is exclusively designed by Kroyer Racing engines and machined from designated forgings on a state of the art 5-axis machine and is 50 grams lighter than the OEM pistons and 6 grams lighter than the closest competitor’s pistons.
- Dry Film Lubrication Coating on piston skirts for increased for longevity and reduced friction.
- Oversized Valve Pockets designed to work with oversized valves.
- WPC hard treated wrist pins for extreme durability.
- Double Pin Oilers provide twice as much lubrication to the wrist pin.
- Anti Detonation Grooves limit the piston/cylinder contact during high temp and RPM.
- Accumulator Groove collects excess blow by and residual gases during combustion and alleviates top ring flutter while increasing ring seal.
- X-Forging. This design enables the use of a shorter pin for added strength and overall weight savings.
- Optimized Cam and Barrel= Tighter clearances; Less noise; Better ring seal; More power; Increased durability.
Each Kit includes 2 pistons with rings, wrist pins and circlips.
Designed to run on 91 octane pump fuel – Will work with stock head, valve train and cylinder.
*Have a qualified technician inspect and verify the condition of your cylinder before installing pistons.

Model: KR800110    Sale Price:$519
Holz Brand  HD Billet Motor Mount Kit, RZR, RZR-S, RZR-4

Install the Holz Motor Mount Kit to prevent potential damage to your motor, diff or transmission cases.
The stock rubber damped motor mounts on the Polaris RZR, RZR-S and RZR-4 have shown to be weak and tear over time- especially under heavier loads or aggressive driving. The soft rubber allows the engine, transmission and rear diff assembly to move or deflect too much and come in contact with the chassis causing potential damage. (See the additional photo below for example.
Other related issues with the stock mounts include clutch belt deflection, and throttle body boot separation.
The Holz Motor Mounts are made using CNC machined 6061 Billet aluminum housing and incorporates a stout poly-graphite urethane isolator to limit vibration and decrease deflection.
This is a direct bolt in kit and does not require any modification for install.
Sold in sets of 3

What is Poly-graphite and why do we use it?
Poly-graphite is polyurethane that has been impregnated with graphite so that it becomes self lubricating and eliminates that annoying squeak that you would get with other rubber or poly bushings. The polyurethane bushings are more rigid therefore much better at absorbing the twisting motion of the motor under load than traditional rubber, but is still forgiving enough to keep the smaller vibrations to a minimum.

Model: 618006    Sale Price:$110 
Holz Brand  RZR, RZR-S, RZR-4 46mm High-Flow Intake Manifold

High flow intake manifold for the Polaris RZR
A must have part for any RZR with a bored throttle body! Larger intake bore size allows more air and fuel delivery. One-piece CNC machined design.
- CNC machined billet aluminum
- Bore size increased from 40mm to 46mm
- Increased airflow over stock manifold
- Includes manifold, o-ring, throttle body adapter, and mounting hardware
- Stronger than OE rubber part that has been known to crack
Note: This manifold may interfere with the mounting some aftermarket intake kits. Our manifold is angled slightly different than the stock unit in order to increase airflow.

Model: 618001    SOLD OUT  & Discontinued     
          
Holz Brand  RZR, RZR-S, RZR-4 Remote Oil Cooler Adapter

Holz Racing Products Remote Oil Cooler Adapter
This billet machined adapter was built to allow you to design and build your own oil cooler set-up as well as be able to mount it where it will benefit you the most.
Heavy engine loads and high performance applications can make your engine temps skyrocket. Adding a remote oil cooler will help address that very issue.
Kit includes everything shown in picture:
- Black anodized billet oil filter adapter with o-ring
- Stainless filter adapter nut
- Blue anodized AN6 male oil line adapters with o-rings.
You will need
- Oil cooler of your choice. We use and recommend Setrab brand coolers.
- Up to 8 or 10 feet of hose. Lines should be as short as possible so as to maintain proper oil pressure.
- Female -6 AN fittings for attaching new oil lines to adapter.
- Fresh oil and oil filter when install is complete.

Model: 613009           Sale Price:$79.95


 

 

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