Twinshock Classes machine guide
The purpose of this list is to provide clarity and remove any ambiguity over which twinshock bikes should be entered in which class.
With some bikes it is never going to be a clear cut decision as to which class they should go in, some models span both eras but with little or no technical update such as the 247 Montesa Cota. This bike would compete in the older class. Some models benefitted from aftermarket frame kits from Majesty, Whitehawk, Miller, Gollner, Cheney, Steve Wilson for example and there were also one-off bikes built by their owners using home built frames.
Where bikes have aftermarket frame kits the class they belong in will be determined by the date that the frame kit was made available, or whether it modernised a bike enough to move it from early to late specification (ie; TY250 with Majesty frame or Suzuki RL with Beamish frame) Some frame kits span both eras such as Bultaco Miller Hi-Boy and its class will depend on which year Bultaco it was designed for.
Class 2 Twinshock
Bultaco up to 1975 model/frame number prefix 150/151 or lower (ie: these are the "slimline" and earlier models)
Bultaco with early type Hi-Boy Miller frame
Bultaco with Whitlock frame
CCM 350 (four stroke)
Ossa MAR MK1 and MK2 (ie: upright rear dampers)
Ossa MAR with Gollner frame
Ossa MAR with Cheney frame (non-cantilever)
Montesa Cota 247
Montesa Cota 247c
Montesa Cota 172
Montesa Cota 123
Montesa Cota with Whitlock frame
Kawasaki KT250 (not Gollner)
Suzuki RL250 Exacta (not Beamish)
Alta Suzuki
Gaunt Suzuki
Yamaha TY125
Yamaha TY175 (not Majesty or similar modified)
Yamaha TY250 (not Majesty or similar modified)
Honda TL125 (including Hi-Boy Miller frame)
Honda TL250
Honda Fraser
Jeffries Honda
Class 3 Twinshock
Aprilia 320
Aprilia TX300
Armstrong.CCM 250 Hiro
Armstrong/CCM 310 Hiro
Armstrong/CCM 320 Hiro
Armstrong/CCM 240 Rotax
Armstrong/CCM 350 Rotax
Bultaco model/frame number 158/159 onwards (ie: the model after the "slimline with seperate tank/ side panel)
Bultaco with later type Hi-Boy Miller frame
Bultaco with Wilson frame
Cagiva
Fantic 125
Fantic 200
Fantic 240
Fantic 300
Garelli 320
Gori 125
Gori 175
Gori 280/320
Honda Seeley
Honda RS200
Honda RS220
Honda RS250
Honda TLR200
Honda TLR250
Honda TLR with Whitehawk frame
Honda TL200
Honda TLM50
Italjet
Kawasaki Gollner
Merlin
Montesa Cota 248
Montesa Cota 348
Montesa Cota 349 red
Montesa Cota 349 white
Montesa Cota 200
Montesa Cota MH123
Montesa Cota MH200
Montesa Cota MH349
Montesa Cota 330
Montesa Cota 349/4
Montesa Cota 350
Montesa Cota 242
MotoVilla 320
Ossa MAR MK3 (angled dampers)
Ossa TR77 (green bikes)
Ossa Gripper TR80
Ossa TR303
RTX
Suzuki Beamish silver engine
Suzuki Beamish black engine
SWM TL125
SWM TL240
SWM TL280/320
SWM TL350
Transama 320
Yamaha Majesty or similarly modified TY175 and TY250
Yamaha Whitehawk