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Default is open on the exup valve. Did you also disable the exup in the ECU?
www.triumph675.net
HOW TO: Free a Seized EXUP Valve
Many Check Engine warning lamps are caused by the EXUP valve failing to operate, in the case of my 675 this was due to the exhaust valve bearing seizing up. The first sign of this is often a loud squeak at start up as the valve cycles through its travel. It's quite simple to free it up yourself...
www.triumph675.net
