Absolutly nothing wrong with prototypes

Under current rules bike like the Britton or the Rotary Nortons, Voxans are all excluded admitedly they might get in the Senior if the rider is of a calibre but it's unlikely.

And why are prototypes excluded? because the big four don't want them beating their lovely mass produced bikes.

Even dear old George Shuttleworth and his Snap would be turned away now...........................

Some rules for the Junior

600cc fours and 750cc twins & max of 6 gears

And rules for the TT Superbike and Senior

1000cc fours and 1200cc twins & max of six gears


As for Superstock..................

Pick your manufacturer and pay the TT organisers the cost of that bike from a showroom. Plus cost of decent suspension
Start of practise your bike will be waiting for you with a sealed engine and some suspension goodies to fit............
If you break the seal you are out.
If you need a new engine one can be supplied at cost from the manufacturer as would be supplied to a normal showroom customer.

Easy really..............discuss