Purest form of VMX

[albrid-3]

New Zealand can adopt VMX Rules from Australia, through MA, or England, USA, I think that England rules are pre74 not pre75.

[bazza]

Mojo Unzud does not race under MNZ  hence lot less complicated and laid back

[GMC]

Hi DJ, good to have you back. You have certainly jumped back in the deep end.

I have to take issue with you on not allowing a flow on rule. I know you’re not alone in your thinking but the flow on rule is about the part / bike being the same.
You talk of pre 75 and then you talk of era but they are 2 different things
A lot of people get hung up on the year but it’s more about the era.
Pre 75 isn’t just about 1974, it’s more about the short travel era.
That’s why long travel 74 models have to have their suspension restricted and some 75 models that are the same as 74 are allowed in.



“no parts from post that era”

If the rear hub on your YZA broke and you needed another you could source one from any of the following models…
Part # = 483-25311-13-98
Part Description = HUB,REAR
Model Count = 22
IT250F 1979 250 IT250 Dual-Purpose
IT250G 1980 250 IT250 Dual-Purpose
IT400C 1976 400 IT400 Dual-Purpose
IT400F 1979 400 IT400 Dual-Purpose
IT425G 1980 425 IT425 Dual-Purpose
MX250B 1975 250 MX250 Off-Road
MX400B 1975 400 MX400 Off-Road
TT500C 1976 500 TT500 Off-Road
TT500D 1977 500 TT500 Off-Road
TT500F 1979 500 TT500 Off-Road
TT500G 1980 500 TT500 Off-Road
TT500H 1981 500 TT500 Off-Road
YZ250A 1974 250 YZ250 Competition Motocross
YZ250C 1976 250 YZ250 Competition Motocross
YZ250D 1977 250 YZ250 Competition Motocross
YZ250E 1978 250 YZ250 Competition Motocross
YZ250F 1979 250 YZ250 Competition Motocross
YZ360A 1974 360 YZ360 Competition Motocross
YZ400C 1976 400 YZ400 Competition Motocross
YZ400D 1977 400 YZ400 Competition Motocross
YZ400E 1978 400 YZ400 Competition Motocross
YZ400F 1979 400 YZ400 Competition Motocross

They are the same part so how do you identify where the part came from?
If you broke a hub and went to the wreckers and they said “here’s one from a TT500” you would say no thanks because you think this cheating but if they had some hubs and didn’t know what bike it came from and it compared the same as your YZA hub then you would be happy as Larry.
Who knows, it may be that Yamaha only used this hub in later models because they made too many of them in 74.



"PRE" means exactly that. "Pre75" no follow-on's

There are very few bikes that fit this rule.
I will use the Elsinore 125 as an example.
The only real difference between the 74 & 75 model is the colour of the tank and some porting (as far as I know)
The colour of the tank is irrelevant as you can paint your bike any colour you like.
The porting is irrelevant as its open season on porting engines so any 74 model can be ported to 75 specs.
For all intents and purpose the 75 model Elsinore fits the pre 75 “era”
It would be totally out of place in pre 78.

There is a lot of hoo ha that goes on here about us being too strict and not laid back, but the strictness is usually only for a National title.
And rightly so. An Aussie title shouldn’t be given to anybody that turns up on any old bike without it fitting the class properly.
Most states run all other races fairly casually.



What I find really ironic is that when a national title is up for grabs there are people complaining that its too strict but when we have fun ride days people complain that it’s not strict enough.

[albrid-3]

Very well explained Geoff.

[DJRacing]

Hi Geoff, how are you?
My purist rules(thoughts) are just that because I know it will probably never happen but as you say the hub from the early yamahas runs for along time threw different eras and there is no way (to my knowledge, someone can correct if I'm wrong) of knowing what bike it came off, but it is still a pre75 part and therefore it would be legal. It would be very hard for anyone to dispute a part with a manufactured series number on it that is exactly the same as the original even down to having the same part number. Maybe my wording is quite wrong as I did write up my feelings of these rules in the space of 10mins. So yes the wording definitly isn't gospel but what I am driving at is the parts that were available in an era are the type of parts we should be using to try to preserve that era. Take for example handlebars, now I can't quite remember when the first set of aluminium handlebars were used as an aftermarket part for motocross but in my "purest" rules you wouldn't be able to use them until the era of when they were available. (About the only part that I would allow from modern motocross would be foot pegs and grips since they are a safety issue).
I'm not sure for the '75 Honda 125 but don't they have serial numbers to say what year they are?  The spin off from purest type rules is that all the parts, including shocks (from the era) are kept preserved and alive which in turn increases the value of the vintage bikes. I'm sure the shocks theory here will be hated by some and others will say old shocks can't be rebuilt but that just isn't true. Shocks can be made to be rebuild able and there is always the after market ones of the era that are usable as well. I'm not saying you can't go out and by brand new guards, side covers, seat foams and covers and the like, as long as they are keeping within the era of which they are to be used.

[Husky500evo]

What about, for example, a '75,'76 or '77 Can Am TNT 250. From what I am aware they are exactly the same as a '74 Can Am TNT 250 and therefore legal to ride in pre '75 250 class by the MA rulebook as a follow on model (and so they are allowed to get into the bar or nightclub, Allison, even though they are not old enough  ). Another example is a '75 WR 400 Husky, which is exactly the same as a '74 WR400 Husky.