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.

10/08/2026

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

12/17/2025

🎉40th Anniversary of the 1985 Honda ATC 250R🎉
Complete Engine Restoration By Duncan Racing
NATIONAL Port
Paul Turner Racing Exhaust
Fat Boy 2 Silencer
Pyramid Reed Valve
Keihin Carburetor

#1985

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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