Quote:
| Originally Posted by mbracing748 Matt, thanks for the email early this week. What bikes can enter the Thunderbike class? |
The list would be huge for which actual bikes are allowed to enter, but here is what the regs say is allowed for 2007:
Single cylinder, Unlimited displacement
Twin cylinder, air cooled, Unlimited displacement
Twin cylinder, liquid cooled, 3 or less valves per cylinder, Unlimited displacement
Twin cylinder, liquid cooled, 4 valve per cylinder, up to 750cc
Twin Cylinder Water Cooled Desmo valves, up to 750cc (Ducati 749 not eligible)
Three cylinder, non-fuel injected, up to 1200cc
Four cylinder, air-cooled, up to 1200cc
Four cylinder, liquid cooled, 1990 to 1992 model year, up to 650cc
Four cylinder, liquid cooled (oil or water), pre-1990 model year, up to 860cc
All air-cooled, 2-valve, unlimited displacement.
(Model year refers to year of manufacturer, proof of which lays with the competitor)
As an example this would allow the likes of all production based: Ducati 748, Ducati 900/1000DS, Buell/Harley (all models), Any Single cylinder (singles can use any frame and do not need to be production based), Yamaha MT01, BMW1100/1200S, SV650, early CBR600 or other Jap 400/600multi (1990-92), Pre 1990 GSXR, RC30 etc, Moto Guzzi (all), Early carb model Hinckley Triumph triples, the list goes on.....
The biggest rule of all in Thunderbikes is the BHP/Weight restriction of 1bhp/4lbs(1.814kg), as measured immediately post race without rider. This is what makes the series so level despite the wide variety of machines taking part.