A list of "follow on models" that are disputed .

[Tim754]

All makes models and classes. AND the prime reason/reasons therefore, Thanks.       (This could be a   v e r y    long  thread....)

[Tim754]

Come on , Things like a Yamaha XS1 650cc powered pre70 solo*  **. People would squeal it is pre75 but they where available to the public in 1968.

* VMX Sidecars neatly avoid the XS650 and CB750 four dramas by having pre75 and pre68 classes

need I mention the range of BSA machines that are lumped into later classes even though they were out dated even on  public release

[Tim754]

1974 release YZ's with the very first "cantilever" rear ends, There is a hornets nest....

[Slakewell]

I reckon the A4 Kawa for Pre 78

[Rookie#1]

I think a lot of the "on the fringe" models always come back to the same point being made, that "model year make" and "model year designation" are 2 entirely different things...

So now I've poked the bear, let's see if it roars?!!   

[oldyzman]

Go the A4 for pre 78, after all its just a 1977 SR250 works replica replica made in 78. :-)
Brett

[firko]

It doesn't matter anymore Tim . Its all pre 95 now .    Trolleys for a few years now  and solos from next year .    I used to think  VMX was celebrating old bikes . I was so wrong . It has morphed now into a industry , and a good one too . They all by licenses , spokes ,wheels , springs , helmets  and lets not forget trophies 

If you took belief in the prophets of doom you'd be forgiven for thinking that is true Walter but in reality the pre 78 and earlier classic classes are not only surviving but are going through a solid resurgence in interest. Genuine classic motocross and dirt track are still as relevant in 2014 as they were in 1988. They're still the main game on a national basis.

[big mac]

How about the 78 YZ400 only real change was the swinging arm.

[Iain Cameron]

Big mac there was more travel and the frame was chrome moly where the 77 was steel . Iain

[JohnnyO]

How about the 78 YZ400 only real change was the swinging arm.

And the all new longer travel front forks..
Enough changes that it's definitely not a follow on model

[Rosco86]

Now I have a 96 CCM with a rotax motor, no real differences from the 95 and 94 so I would imagine it would be included as a follow on model.

[Mick D]

75 and 76 KE/KD 125 Kawasaki are identical in every aspect except colour to 1974 KS/KE125, so I imagine they are a legit pre-75 carry over.

Little Elsinores are getting up in value and sort of dominate the class.
These little six speed rotary disc Kwakas are dirt cheap and have a monster parts availability.
I imagine it could only help bolster a fun thinning class.

[big mac]

Seeing how all pre78 bikes have to have 9" how could the extra travel be an advantage. having compared both motors in the yz400 there is 3/5's of nowt difference. So that only leaves the cro-mo frame.

[Brian Watson]

and there is no dispute about a 1974 Cantilever Yammie..it is IN...

[JohnnyO]

Seeing how all pre78 bikes have to have 9" how could the extra travel be an advantage. having compared both motors in the yz400 there is 3/5's of nowt difference. So that only leaves the cro-mo frame.

A 78 YZ400 is visually and technologically different to a 77 model and definitely not a follow on. Its an Evo bike, surely thats not hard to understand?