Police say it's "completely unacceptable" for bikers to be caught doing more than double the speed limit.
Yesterday they stopped a motorcyclist who was travelling at 76 miles per hour in a 30 mile per hour zone.
On Saturday they caught a local rider doing 135 miles per hour in a 60 zone.
There are three unmarked police bikes in operation over the TT fortnight to stop riders flouting the rules - officers say speeding in restricted areas will "not be tolerated".
Bus strike's end is bittersweet, says union leader
MHK says to contact him over car tax issues
Hospital bed capacity to be discussed in Tynwald
Weather warning for coastal overtopping later
Heysham ferry to run with delay this morning
Spike in number hit by data breaches
Town centre road to shut for a day next week
Politician questions powers to remove non-native plants