Duncan Racing International, Inc.

Duncan Racing International, Inc. Since 1977. Specializing in ATC/ATV/Motorcycle/UTV Engine Rebuilding/Repair & Performance Parts. #
(5)

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.

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

We are SO thankful for every one of you and all of your support. Happy THANKSGIVING! See you in the desert.
11/27/2025

We are SO thankful for every one of you and all of your support. Happy THANKSGIVING! See you in the desert.





11/12/2025

UPGRADED Banshee Builds Loading….

10/29/2025

💥Roll Design Lobo powered by Duncan Racing 340cc PC 2000 Power Valve

Build was formerly Doug Eichners. Refurbished for the Christy Collection
Paul Turner ELIMINATOR Pipe
Fat Boy 2 Silencers
Pyramid Reed Valves
Keihin PWK Carburetors
DR Chrome F. Bumper
ELKA Stage 5’s,
GPR Stabalizer
Hinson Clutch
Crown Series Brake Lines
RK Chain
Maxima Lubricants
SSI-DR Custom Chrome Graphics
Pro Top Seat Cover
Flexx Bars
IMS Tank
RPM Axle
ITP Holeshots
DWT Wheels

25 Years Ago! 🏆 DR Factory Rider, Travis Spader, won the 2000 GNC 250 Pro Champion. #2000
10/23/2025

25 Years Ago! 🏆 DR Factory Rider, Travis Spader, won the 2000 GNC 250 Pro Champion.

#2000

Duncan Racing Yamaha YFZ 450R>Complete Build<DR-HP4 Race Head ModVortex ECU National Pipe DR Chrome Front Bumper ...
05/22/2024

Duncan Racing Yamaha YFZ 450R
>Complete Build<
DR-HP4 Race Head Mod
Vortex ECU
National Pipe
DR Chrome Front Bumper










Handlebars




Top seat covers

A Duncan Racing Banshee in Cairo, Egypt! Our client, Mahmoud, of over 10 years assembled his ATV all the way over in Egy...
03/21/2024

A Duncan Racing Banshee in Cairo, Egypt! Our client, Mahmoud, of over 10 years assembled his ATV all the way over in Egypt. DR supplied all parts and did engine modifications then shipped components to Cairo, Egypt. It even has an Egypt license plate. 🔥 We were fortunate enough to be able to finally meet him and see the DR banshee in person in Egypt. Thank you Mahmoud Sabala!

Yamaha Banshee includes:
Duncan Racing NATIONAL KIT
Paul Turner Pipes
Fat Boy 2 Silencers
NATIONAL Port
Pyramid Reed Valves
Master Flow Intake
Keihin 34mm PJ Carburetors
Hinson Clutch
DR Quick Change Clutch
Roll Front End
Elka Shocks
GPR Stabilizer

👏 ❕We love to see it! ❕👏 has given the primary cover shot to a sport quad! comeback!!! Thank you , let’s keep it goin...
02/27/2024

👏 ❕We love to see it! ❕👏 has given the primary cover shot to a sport quad! comeback!!! Thank you , let’s keep it going!!
📸 :


















Address

9380 Bond Avenue, Suite B
San Diego, CA
92021

Opening Hours

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

Telephone

+16192586306

Website

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