Motorcycle Questions? Ask a Mechanic.
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Initially, these are 'security' bolts thus are tamperproof screws; i.e. when tightened, the top portion breaks off.
Thus being so, the only way to remove would be to drill out the remaining top portion with a suitable size drillbit.
In most instances, the remaining top portion would shear away while still drilling and the ignition switch can now be removed.
In some others, an easyout may be needed. Please click HERE.