Duncan Racing
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Shop Products
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
Instructions Technical Documents Rebuild Process & Shipping
2-Stroke Engine 2-Stroke Exhaust 4-Stroke Engine 4-Stroke Exhaust
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 Warranty Purchase Vortex Vortex ECU Installation and Tuning Tips Technical Documents Who Uses Vortex
History Photos DRI in Print Contact Us
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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 DR IN PRINT Products 2-Stroke Engine 2-Stroke Exhaust 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
Duncan Racing International
Shop Products

 2 Stroke

2 Stroke Engine Break In

2 Stroke Top End Assembly

2 Stroke Pressure Test

Compression Testing

Engine Removal and Replacement

2 Stroke Honda

HON TRX250R National & Eliminator Kit Tips '86-'89

PC2000 Power Cylinder General Info (265, 275, 305, 340)

HON TRX250R Center Case Machining PC2000 (305/340)

PC2000 Power Cylinder- How to Order Replacement Parts

PC2000 Power Cylinder General Info (265, 275, 305, 340)

PC2000 Power Cylinder- How to Order Replacement Parts

Race Fuel -  General Information

Ethanol Gas FAQ

2-Stroke Lower End/Crankcase Flush

2 Stroke Suzuki

SUZ LT250 National & Eliminator Kit Assembly Tips '87-'92

SUZ LT500 Clamp-On Airbox Adapter

SUZ LT500 National Kit Assembly Tips '87-'90

SUZ LT500 Water Pump Information

SUZ LT500 OEM Exhaust Valve Information

SUZ LT500 OEM Clutch Information

Paul Tuner Pipes- General Information

Fat Boy 2 Repacking Instructions Quite or Standard

Air Filter Maintenance

ATV Washing Tips

2 Stroke Yamaha

YAM Banshee National Kit Assembly Tips  '87-'08

YAM Banshee Eliminator Supplement Document

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Hours of Operation:

Tuesday-Friday 8:00am -5:00pm PST

*Closed Sat, Sun, Mon

*Available by Appointment After Hours - Call to Schedule!

Duncan Racing International, Inc

9380 Bond Ave Suite B, El Cajon, CA 92021

Phone: 619-258-6306 | Fax: 619-258-6309

sales@duncanracing.com

Contact Us
Duncan Racing International, Inc
9380 Bond Avenue Suite B,
El Cajon, CA, 92021,
United States
619-258-6306 sales@duncanracing.com
Hours
Tue 8am - 5pm
Wed 8am - 5pm
Thu 8am - 5pm
Fri 8am - 5pm

© Duncan Racing International, Inc. 2025 | All Rights Reserved.