Duncan Racing's Complete Engine Performance Package for the Honda 300EX.

UNFORTUNATLEY THIS KIT IS NO LONGER AVAILABLE IN COMPLETE FORM.
Carburetor and Exhaust have been discontinued.

DR HP4 Head builds are still available * see HP4 Valva Train Section.
Various Pistons options are also available.

Call DR for additional information #619.258.6306

NATIONAL Kit Includes: discontinued.
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 and or parts. Example: Boring, Gaskets, Guide Seals, etc. are additional cost

Cores Required:
Cylinder, Head, camshaft, CDI

Power Gain: 30-40%