CLICK HERE


 
The Official Duncan Racing ATV Buyers Guide


YOUR GUIDE TO THE HONDA 300 EX

ENGINE

300 EX S-1 Kit

BOLT-ON KIT

STAGE 1 Kit (S-1) 

#BK4-3000    $531.00

Includes: Includes: Complete Fat Boy 4 Exhaust System (with STD Muffler), Jet Kit, K&N Filter & Outerwear
To purchase the Stage 1 Kit click here


Power Gains:
15-20% gain in HP
Excellent Start Up Performance Mods. Stage 1 Power Kits are designed to work with most DRI engine kits

 

DRI  NATIONAL Engine Kit                     

#EK-30NT    $1375.00

Not available online- Please call DRI to purchase

**CDI Mod Not available for '06-'07models

DRI National Kit

Includes: Fat Boy 4 Complete Stainless Exhaust, Camshaft, HD Valve Springs w/chromally retainers, 38mm PE Carburetor Kit (thumb or twist), Jet Kit,  Piston Kit, DRI Porting & Valve Job, CDI Modification,  K&N Filter, Outerwear, T-Shirt

·         Price plus any necessary machining and or parts. Example: Boring, Gaskets,
           Guide Seals, etc.  are additional cost

Cores Required: Cylinder, Head, camshaft, CDI

Power Gain: 30-40%

Optional Upgrades: Edelbrock Carburetor Kits      call for price

 

HD Valve Spring Kit w/Titanium Retainers & Bronze Guides        

$301.50

 

INDIVIDUAL ENGINE COMPONENTS   (all items maybe purchased separately)

 

Fat Boy 4 Complete Stainless Exhaust System  
Also fit Honda 250X (all years)

#FB4-EH3000               $499.00

* No HQ mufflers available 
To purchase the Fat Boy 4 click here

Fat Boy 4 Exhaust
Fat Boy 4 Accessories
Fat Boy 4 Turndown

Optional Fat Boy 4 Accessories:  
#FB4-4A250      $39.95    Turndown              
#06-554             $17.95   Spark Arrestor        

Notes:

1. Turndown bolts on rear end cap, o-ring seal.
To use spark arrestor turn down is required.

2. Rejetting is required, with installation of Fat Boy 4.

 

QP-2 Quiet Tip

#FB4-QP-2   $129.95

Bolts on rear end cap of Fat Boy 4.

Lowers DB readings a minimum of 2-3 dbs.

Forestry approved when used with screen.

* Note: Some rejetting may be required.

** Available in silver only
To purchase the QP-2 Quiet Tip click here

QP 2 with screen
Fat Boy 4 with QP-2

To purchase Fat Boy 4 Accessories click here

To purchase Fat Boy 4 Replacement Parts click here


Custom Colored FAT BOY 4 Mufflers

Custom anodized color components (muffler, end cap & turndown) are at an additional cost to the base price for the Fat Boy 4 and the components (Turn down & End cap).

*Available by special order only

**Lead time can be 1-2 weeks
Fat Boy 4 mufflers are available in a Black, Red or Blue anodized finish.
Muffler bodies, rear end caps or turndowns are available colored individually or as a complete package.
*DRI cannot guarantee colored anodized mufflers will not fade over time.


Purchase Options :

FB4-A3PCO       $129.95    3-piece package; Muffler, End Cap and Turndown
FB4-A1ECO        $24.95     End Cap ONLY
FB4-A1TDO        $24.95     Turndown ONLY
FB4-A1MFO        $89.95
     Muffler ONLY

**Custom Color prices are in addition to the regular Fat Boy 4 price

Example: 300EX Fat Boy 4 Complete Exhaust System-     $499.00

               Custom Colored 3-piece package                 +    $129.95

               Total cost with color option                          =    $628.95

Custom Black
Custom Blue
Custom Red
Custom Colored End Caps
Custom Colored Mufflers
Custom Colored Turndown


Pistons

Wiseco forged  11-1  Sizes: Std, 2nd, 4th, 6th, 8th                                            
#4574      $100.80

DRI Camshaft Billet    

All Around Power              #MC-1253-05B            $219.00
Lift .336”/Duration 249 degrees

Top End  Power                 #MC-1253-25B            $219.00
Lift .370”/Duration 272 degrees
No core required
Must Use HD Valve Springs

DRI Camshaft  Hardfaced           

All Around Power              #MC-1253-05H           $149.00
Lift .336”/Duration 249 degrees

Top End  Power                 #MC-1253-25H           $149.00
L
ift .370”/Duration 272 degrees

Core Required (or pay core charge of $109.00)
Must Use HD Valve Springs

 

CARBURETAOR KITS

Keihin PE Carb

Keihin 38mm PE Carb Kit (thumb or twist)       

Includes; Carb, manifold adaptor, twist throttle & cable or cable to work with stock thumb throttle
#K-CR38E-H         $229.00

Edelbrock Carburetor Kit   with Twist Throttle      
#EB-3106
              $445.95

Edelbrock Carburetor Kit   with cable for thumb    
#EB-3007
               $445.95

 

CLUTCHES

 

DRI Clutch Kit (fibers,steels,springs)                      
#DR-C13X
              $119.00

To purchase the DRI Clutch Kit click here

 

ENGINE SERVICES

 

DRI Porting & 3-Angle Valve Job                         #PO-4VLV-VJ          $495.00
                  Labor price only, plus any parts required (valves, guides, seals etc.)
                  Must send head into DRI for modification
                  DRI removes guides when performing porting process

Complete Engine Rebuilding                                           #ER-4445                $650.00
(Teardown & Reassembly)

Cylinder Bore and Hone                                        #MS-704S                $75.00

Valve Job            (2-Valve)                                      #MS-8002               $100.00

Cylinder Install Sleeve, Bore, Surface                   #MS-6000               $195.00

Crankshaft Rebuild                                                #MS-9011                $125.00

Flywheel Modification                                           #MS-5000                 $85.00

·        ALL ENGINE SERVICE PRICES ARE PLUS ANY ADDITIONAL PARTS REQUIRED

 

CHASSIS

DR Chrome Front Bumper

 

DRI Chrome Front Bumper                 

#DR-13X0      $179.00

To purchase the DRI Chrome Front Bumper click here

 

 


ELKA SHOCKS

Elka Shocks

Replacement Model   

Front pair without reservoirs    from $ 515.00
Sport Model              

Front pair with reservoirs         from $ 715.00
Sport Model               

Rear  with reservoir                 from $ 745.00

· Call DRI for specific application needs and part numbers
regarding Elka shocks


Nerf Bars   -
Aluminum Bolt-On                   

#DR-1300         $189.95

 

Grab Bars  -Aluminum Grab Bar                 

#GB-1300         $59.95

 

Skidplates       

Engine Skidplate                      

#H-119              $64.95
Swingarm Skidplate                 

#H-110              $89.95

 

BRAKES

Front Disc                            

#DF712W           $130.00
Rear Disc                                                           

                          $119.00
Brake Pads (front & rear)     

#686                   $29.99    


ACCESSORIES

Thumb Throttle Cover

Billet Accessories 


Thumb Throttle Cover         

#DR-TC25X           $39.95

Handlebar Clamp                         

#DR-10HC             $29.95
(red, blue, silver)

 

IMS Fuel Tanks 3.8 Gallon  (white, blue, red or natural)         

#12-2223                $225.00

            

TAG Handlebars


Oversized  T2 Bars          $94.95
Stock Style X5 Bars         $79.95

 

Motion Pro      

Cable: Terminator Clutch               

#02-108                   $22.95
Cable: Thumb to 38mm PE            

#X-231                    $24.95
Cable: CR Throttle to 38mm PE      

#X-232                    $24.95

 

Cut Off Switch     Pro Design Cut-Off Switch  (red, blue, white, black, yellow)          

#PD-5000                $34.95
                

 

Shockwears  (Available for all shocks)                                                

                              $59.00 set

 

Rear Fender Decal Strips

Rear Fender Decal Strips
"4-Stroke" Red
                  #DR-RF-D45-R           $18.95

"4-Stroke" Blue
                 #DR-RF-D45-B           $18.95

"4-Stroke" Silver/Red        
#DR-RF-D45-SR         $18.95

"4-Stroke" Silver/Blue        #DR-RF-D45-SB         $18.95

To purchase a DRI Rear Fender Decal Kit click here


DR Number Plates (3pc set)

** Please Note: These are the DECAL BACKGROUNDS and not the plastics
        

WHITE            #DR-850                          $24.95
BLACK            #DR-825                         $24.95
RED                #DR-840                          $24.95
BLUE              #DR-830                          $24.95

YELLOW         #DR-835                          $24.95

GREEN            #DR-827                          $24.95      
To purchase the Number Plates click here

Red
Black
White
Blue
Yellow
Green