Thruxton Cup Challenge

This class is open to 865cc air-cooled Triumph Thruxtons and Harley

Davidson XL883/1200 Sportsters and follows AHRMA Supersport rules (see 9.8.1) with the following exceptions:

a) Stock fuel tank, side covers, seat cowl and fenders must be retained in the stock location. Side covers may be modified or replaced if high-mount exhaust pipes are used. No additional fairings, bodywork, streamlining or ducting may be added. b) Stock headlight shell must be retained in the stock location. c) Stock gauges must be retained in the stock location. Speedometer may be removed. d) Stock seat pan must be retained, although the padding and/or covering may be modified. e) Inner rear fender may be removed. f) Cylinders must be stock bore; no overbore allowed. g) Electric shift devices (quick-shifters) are not allowed. h) Secondary air system may be removed. i) Rectangular or oval number plates may be used. Minimum 6” tall numbers may be applied to the front and rear cowl if so equipped. Sharkskin front number cowl is allowed. j) Treaded racing tires required. No slicks or hand-cut slicks allowed. Rain tires may be used. k) Updating and/or backdating of parts is allowed. l) OEM triple clamps must be used. Thruxtons may update or backdate the OEM triple clamps to run either handlebars or clip-ons, at the rider’s preference.

In addition to the above rules, the following rules apply specifically to the Harley Davidson XL883 and XL1200 Sportster: 1. May displace up to 1204cc using Harley-Davidson or Buell cylinders with a maximum bore of 3.5 inches. Aftermarket cylinders are not allowed. 2. OEM seat and rear fender may be replaced with an XR750-style one-piece seat/fender unit. 3. Gas caps and oil tank caps must be secured by either duct tape or lockwire. 4. All front fender rivets must be drilled out and replaced with nut-secured bolts. 5. Belt drive final drive may be replaced with conventional sprockets and chain. 6. Aftermarket air filter and/or aftermarket air cleaner may be used. No scoops or ducting allowed. 7. Aftermarket ignition modules are allowed. 8. The Harley-Davidson XR1200, or any of its components, is not allowed 9. Machines must meet all standards as noted in section 3.3, 9.3, 9.4, 9.5, and 9.8. 10. 18-inch front rims may be used with OEM hubs. 11. Handlebars or clip-ons may be used.