Nice streamliner frame, hardtail too!
Gonna try and shoehorn a 600cc motor into that frame?
No that is not designed for a 4 cylinder engine. That is a Open (no Aero) Special Construction - A - Fuel - F - 250cc Class Bike
ok the DLRA Classes or based on a number of things:
First is the Engine Class you can choose from.
Fuel and Induction type Engine size, technology or era.
Engine Sizes from 50cc up to 3000cc and Unlimited. a CBR600RR would run in 650cc class.
Fuel type: Gas Class - G for Petrol/Gasoline (fuel testing required) and Fuel Class - F anything else. Methanol etc (no fuel testing)
Engine Technology or Era:
Production: No visible
external Modifications of any sort are allowed ( no restrictions on internals apart from capacity within Class limits, so a 636 cc Big Bore Kit is legal for a CBR600RR)
Post 1986 Any Bikes/Engine are simply Gas or Fuel (Blown if applicable).
Pushrod Engine Class any Pushrod Engine. (no age limit)
Classic Engine Class From Jan 1st 1957 - Dec 31st 1986 Carby/Aircooled OHC or 2 Stroke Engines (no pushrod) - C
Vintage Engine Class: Pre 1956 (cutoff Dec 31st 1956 ) Period Technology only.- V
Induction: Normally Aspirated; Carburetor and EFI Classes (simply the G or F ) and Blown Class: - B - Forced Induction. Supercharged/Turbo etc.
The Engine Class for a everyday CBR600RR on Premium Petrol/Gasoline with a visible piggyback ecu and aftermarket Pipe would be Modified Gas 650: MG - 650, or a Turbo Methanol engined CBR would be Modified Blown Fuel 650: MBF - 650.
I'll leave it there
and do these others next time
Chassis design: Production, Modified, Special Construction, Sidecar and Trike.
Aerodynamics. Open (no Aero), Partial Streamlined and Streamliner.