Buy some 112 octane leaded racing fuel (purple wonderful) mix your fuel and oil mix and go ride hard! It will purge the exhaust from tip to tip including silencers!!!!!warning may burn piston up in processalso it's hard on rings also!
Do this at your own risk we do not and will not be held responsible for any damages that could occur from this procedure. Have the exhaust header hot tanked is another choice but not the aluminum silencer!!! Here again we are not responsible for any damages that could occur to the exhaust system