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Race motor on pump gas!

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Hey gang,

Just got my ‘03 WR450 back from Big Gun Exhaust and all I can say is, WOW! Mike “Big Gun” Young called me a month or two ago telling me he could make the WR haul the mail while still running ‘pump gas’.

A bit skeptical I took him up on the offer and it turns out it was no BS! After break in I found myself having to ride a gear taller just to keep the rear wheel from spinning! The WR will be put to the test by the current class 21 Baja championship DP Racing team next weekend. Look for articles on ORC (www.off-road.com/dirtbike) in the coming months.

Mods done by Big Gun:

YZ Cams

Titanium spring top kit

Port Head

Radius Seats and Back cut valves

Squish Head Chamber

Set Up

Wiesco Piston

Thermal Dynamic Head Dissipating Coating for head

YZ/WR 450 Low Boy ‘Big Gun’ exhausts System

Mike Hobbs


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