Eligibility query

[ted]

If a  YZ 465 H 1981 model was fitted with a seat and tank off a `82 model ( which has linkage suspension ) still be eligible for EVO class or would it become a Pre `85

[E74]

still evo

[ted]

How come

[ted]

Thanks for the manual E

[Nathan S]

How come

Because Evo is a technology class, not an age class.
You could fit the seat and tank of an 09 YZ450F, and it would still meet the criteria.

[Husky500evo]

 Here is an example that will cause some controversy. It is an '82 YZ490J, that has the original linkage & swingarm replaced by an '81 YZ465 swingarm ( which fits straight in & attaches to the '82 shock ) . The UK guys look to have a few of these running in their twinshock class , which is equivalent to our Evo class . I actually don't have a problem with it , as I couldn't see it being any better than an '81 Maico 490 which is generally regarded as the best bike in the class ( except by a few misguided individuals  ). It would make a use for a bike that is not a very competitive pre'85 class bike & I might even build one up myself , to sell locally & get another bum on a seat ( as we need more evo class numbers in my area ). I know this bike would cause howls of protest if it ever showed up at a title meeting though .

[Husky500evo]

Here's another one with a custom aluminium tank .

[Nathan S]

I know this bike would cause howls of protest if it ever showed up at a title meeting though .

Might be a good way to get the rules sorted out properly, though?

[yzhilly]

I'm not  sure about the big bore ,but the IT250J is EVO legal as it is Monoshock what was the bigbore . These might be just modified IT's  .

[Nathan S]

IT465J looks just like an IT250J with a fatter pipe.

The possible drama with the converted linkage-rear bike is that the 490 motor didn't come in an originally Evo class bike. The reality is that it meets the criteria, so it is legal, but some people don't see it that way.

[mboddy]

The reality is that it meets the criteria, so it is legal, but some people don't see it that way.

The 2009 Manual of Motorcycle Sport (MoMS) says what the criteria is.
It says:
17.7.12 Evolution Class - Eligibility
...
18.7.12.2 Modifications converting later equipment to comply will not be allowed

So it is not legal.

[VMX247]

you EVO guys are the future VMXer's as the pre 75 move on in years.....
so get it right and make the pre 75 movement proud of you.

[Nathan S]

"18.7.12.2 Modifications converting later equipment to comply will not be allowed"

So it is not legal.

Easy to side step. Call it a 2009 model Teddles490 on your entry form and you're home and hosed.

[LWC82PE]

i spent quite a lot of time reading this today
http://ozvmx.com/community/index.php?topic=3802.0

the more i got into it the more i think the 78-85 era rules/classes needs to be somehow cleared up/changed

[mboddy]

Easy to side step. Call it a 2009 model Teddles490 on your entry form and you're home and hosed.

I am a scrutineer and I would not pass it.
18.7.12.1 Bikes will be OEM
Yamaha is the Original Equipment Manufacturer, not Nathan or Teddles.
Yamaha manufactured all of the Major Components of the bike in 1981.

Now back to the original question.
Evo is not a Period. That is why you can enter a bike in both Pre 1985 and Evo at a Championship meeting.
The Period of the 1981 bike and the 1982 seat and tank are Pre 1985 and so they conform to rule;
18.7.12.3 All components will be of the period the machine was manufactured   
Therefore it is ok to use them.