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Services
Engine Rebuilding Process
Engine Rebuilding
2-Stroke Porting
4-STK Cylinder Head Center
Custom ATV Builds
Machine Shop Services
Engine Work Order Form
Shipping Tips
Engine Rebuilding FAQ
Tech Center
Instructions
Technical Documents
Rebuild Process & Shipping
Racing Team
Sponsors
Trackside Support
Apply For Sponsorship
Products
2-Stroke Engine
2-Stroke Engine
4-Stroke Engine
4-Stroke Exhaust
Info & Forms
Shipping Tips
Standard Work Order Form
Engine Work Order Form
Retail Price List
How to Ship your Quad
Credit Card Authorization
Fat Boy 4 Warranty
Dealer Application Form
DRI Terms
Vortex
Vortex Warranty
Purchase Vortex
Vortex ECU Installation and Tuning Tips
Technical Documents
Who Uses Vortex
About
History
Photos
DRI in Print
Contact Us
Duncan Racing International
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4-Stroke Engine
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4-Stroke Bolt-on Kits
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4-Stroke Pistons
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4-Stroke Pro Flow Air Cleaner Kits
4-Stroke Specialty Products
Big Bore Kits
Camshafts & Valve Springs
Carburetors - Keihin 4-Stroke
HP4 Valve Train Kits UTV
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PC 4000 Power Cylinders
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Yamaha YFZ 450R Aluminum Overflow Bottle
$149.00
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YAM YFZ450R ZIP Hi Capacity Oil Cover w/Window
$249.00
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Yamaha YFZ 450 ('04-'06) Oiler Upgrade Kit
$649.00
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Custom AirBox Lid - Enduro Honda 700XX
$139.00
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Oversized Radiator
$525.00
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700XX Oversized Radiator with Dual Fans (Fans Included)
$799.00
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CBR Radiators
$0.00
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Oil Cooler Kit '06-'14 Honda TRX 450ER
$1,095.00