Duncan Racing International, Inc.

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Duncan Racing International, Inc. Since 1977. Specializing in ATC/ATV/Motorcycle/UTV Engine Rebuilding/Repair & Performance Parts. #

Complete ATC/ATV/Motorcycle/UTV Engine Rebuilding
2 Stroke & 4 Stroke Porting,
Serdi Valve Seat Machining,
Cylinder Boring/Resleeving,
Crankshaft Rebuilds
High Performance Engine Kits;
2 Stroke & 4 Stroke
Dyno Tuning And Testing

You ship us your parts - We do the modifications
We ship it back to you! Fat Boy 4 Exhausts, Fat Boy 2 Silencers, Paul Turner Pipes, PC 2000 Cylinders,
PC 4000 Cylinders, Powerheads and Pyramid Reed Valves
are all proprietary products of Duncan Racing International, Inc.

10/22/2026

High Percentage HD Transmission Gears & Shifts
- Built to handle the power
High Performance Builds to Stock Replacement
- MotoGears are manufactured from the highest quality materials, machined to closest tolerances, undergo significant heat treat analysis
- complete gear sets or individual gears
🔥In STOCK!



* see duncanracing.com for more information

10/08/2026

DUNCAN RACING HONDA ATC 250R BUILD

PC 2000 305cc PowerValve Engine Kit
Paul Turner Pipe
Fat Boy 2 Silencer
MotoGears Transmission Gears
Pyramid Reed Valve
Keihin 39 PWK Carburetor
ELKA Stage 5 Rear Shock
Hinson Clutch
Billet Mag Cover
Billet Q/C Clutch Cover
Crown Series Brake Line
Beringer F. Master Cylinder
Flexx Bars
RK Chain
Maxima Lubricants
SSI-DR Custom Graphics
Pro Top Seat Cover
Baja Design Lights
434 Designs
Ricky Stator
Flexx Bars
Clark Tank
Dominator Axle
Works Connection Perch
V***r Blast mixed with Candy Blue Powder

09/24/2026

Motogears now available exclusively in North America at Duncan Racing!
Honda ATC/250R Transmission Gears in stock now!
Check our website for more details.

09/09/2026

DUNCAN RACING BANSHEE BUILD
“ELIMINATOR DUNER”

403 ELIMINATOR Engine Kit
Paul Turner High Rev Pipes
Fat Boy 2 Silencers
Powerhead
Pyramid Reed Valves
35mm PWK Keihin Carburetors
Master Flow Intake
DR Chrome F. Bumper
Roll Lobo A-Arms
ELKA Stage 5’s, ELKA Rear Link
GPR Stabalizer
Hinson Clutch
Crown Series Brake Lines
YFZ 450 Spindals/Brakes/F.Hubs
RK Chain
Maxima Lubricants
SSI-DR Custom Purple Graphics
Pro Top Seat Covet
BD Squadron Lights
Ricky Stator
Flexx Bars
IMS Tank
Dominator Axle

08/20/2026

DR Restoration on a 1986 Honda ATC 250R
🔥Complete restoration and rebuild🔥
—>Original Owner—>Restored in ‘01–> Restored in ‘26
Paul Turner National Port & Head Rechamber
Paul Turner H/R pipes w/ Black Cerakote
Dual O-Ring exhaust fl**ge
Pyramid Reed Valve
Hinson Clutch
Keihin PWK w/ Super Flow
Powder Coat-original finish

08/12/2026

Duncan Racing BANSHEE TRIO 🟣🟠🔴

—> Look for feature in upcoming Dirt Wheels Magazine

421 NATIONAL Midrange kits
Paul Turner Midrange Pipes
Fat Boy 2 Silencers
NATIONAL Port
POWERHEAD
Keihin Carburetors
Pyramid Reed Valve
DR Quick Change Clutch
Hinson Clutch Components Clutch Baskets
Ricky Stators ricky stator
Roll - Elka Suspension Inc. Stage 5 Suspension
GPR Stabilizer
RK Chains Excel Rims
Flexx Bars
ITP Tires & Wheels
Maxima Racing Oils
Works Connection
SSi Decals
SERIOUS PERFORMANCE

07/02/2026

1993 Yamaha Banshee!!!
Original owner
Original plastic and decals
Off Road Trim
Complete Duncan Racing build
NATIONAL Midrange kit
Paul Turner Midrange Pipes
Fat Boy 2 Silencers
Powerhead
Pyramid Reed Valves
Keihin 34mm PJ’s
Carburetors
Hinson Clutch
Duncan Quick Change Clutch cover
Billet Covers
RK Chain
Roll Stem
Stabilizer GPR
Roll Design A-Arms
Elka Stage 5’s
Elka Rear link
Pro Top Seat Cover
DR Chrome F. Bumper
Flexx Bars
Works Connection Perch
Baja Design Lights
Custom Billet Purple trim package

06/24/2026

DUNCAN RACING CUSTOM TEIR 1 ENGINE BUILD

424cc NATIONAL Engine Kit
Paul Turner H/R Pipes
Powerhead
National Midrange Port
Pyramid Reed Valves
Master Flow Intake Manifold
Keihin 34mm PJ Carburetors w/ SUPER FLOW Mod
Hinson Clutch
DR Quick Change Clutch Cover
Billet Mag and Waterpump Covers
Maxima Lubricants
Violet Purple Prismatic Powder Coat

05/21/2026

🔵Duncan Racing Complete Engine Build🔵

1990 Suzuki LT 500 QuadZilla

Paul Turner ELIMINATOR Port
POWERHEAD
PYRAMID Reed Valve
Paul Turner Racing LT 500 Exhaust w/ CNC Dual O-Ring Exhaust Fl**ge
MotoGears Complete Transmission
MotoGears Shift Forks
Hinson Clutch
Powder Coat Candy Blue & Super Chrome Plus
Crankshaft Rebuild
DR Flywheel Mod
Cylinder Resleeve
#1990

02/19/2026

Duncan Racing BANSHEE Motor Builds
421 NATIONAL Midrange kits
Paul Turner Midrange Pipes
Keihin Carburetors
Pyramid Reed Valve
DR Quick Change Clutch
Hinson Clutch Baskets

Address

9380 Bond Avenue, Suite B
El Cajon, CA
92021

Opening Hours

Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

Telephone

+16192586306

Website

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