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Honda TRX 300EX DRI National Engine Kit — Duncan Racing
https://www.duncanracing.com/4-stroke-engine/honda-trx-300ex-national-engine-kit
Duncan Racing's Complete Engine Performance Package for the Honda 300EX. Includes: Fat Boy 4 Complete Stainless Exhaust, Camshaft, HD Valve Springs w/ chromoly retainers, 38mm PE Carburetor Kit (thumb or twist), Jet Kit, Piston Kit, DRI Porting & Valve Job, CDI Modification, K&N Filter, Outerwear, T-Shirt. *Price plus any necessary machining ...
Honda 300EX Camshafts — Duncan Racing
https://www.duncanracing.com/4-stroke-engine/honda-300ex-camshafts
DRI has discontinued Billet camshafts for the 300 EX. Price $299.00 with good stock oem core. CORE REQUIRED: Stock Camshaft for Hardfaced option only. If the customer does not send in a stock OEM camshaft core in good condition a $196.00 (additional) core charge will apply. MC-1253-05B X5 Grind Cam (Billet) DISCONTINUED.
Honda 300 EX HP4 Valve Train Kit — Duncan Racing
https://www.duncanracing.com/4-stroke-engine/honda-300ex-hp4-valve-train-kit
Duncan Racing International's HP4 Valve Train Kit is designed to give you the utmost in performance and reliability by using the most advanced equipment and techniques in the industry. All porting work is performed by our master technician and valve seat cutting is done on our in-house SERDI valve grinding machine. DRI HP4 PURCHASE OPTIONS DR ...
Honda TRX 250X/300EX Fat Boy 4 Complete Exhaust System
https://www.duncanracing.com/4-stroke-exhaust/300ex-fat-boy-4-exhaust-system
Fat Boy 4 4-Stroke Power Exhausts are a proprietary product of Duncan Racing International, Inc. DRI is the sole manufacture and developer of this product. DRI has designed this product to be the top ATV 4-Stroke exhaust on the market. ... On 300EX models it is mandatory, to achieve full performance gain that Rev Limiter in CDI is modified. DRI ...
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