What bikes are eligible for what classes

[enzo906]

Hi Guys
can anyone help me or point me in the right dierection, I tried searching but not sure of the different answers I have found, and different things people have told me

Pre 75 - is an xl350 76 eligible for MX? in pre 75

Evo - How can a new maico 81 (2012 model) be eligible but a cr500 air cooled motor in a converted twin shock frame (cr 480 RC modified frame with fox shocks) with a twin leading shoe brake not be eligible?

How does the YZ series fit in to evo if they never had twin shocks? can you race a 465G in Evo? what is the cut off for the YZ's

Finally pre78 -  YZ D is the cut off correct? as they were 77 models and is methanol allowed in pre 78 MX because it was in 78 when I raced my 125D on Methanol (still have the carby with the jets ready to go in storage for 36 years!)

Any help appreciated and sorry if this is a question that is overly repeated but internet savvy I am not. I still can't work how to put a picture in a question.

[GD66]

The XL350K1 model is acceptable in pre-75.

YZ fits into Evo as it was a monoshock produced in the day, but not with a linkage system.

Methanol is ok.

[firko]

Pre 75 - is an xl350 76 eligible for MX? in pre 75
The '76 XL350 is not legal for pre 75 because of its centre inlet port. Fit an earlier side port head and I'm sure you'll then be legal.

Evo - How can a new maico 81 (2012 model) be eligible but a cr500 air cooled motor in a converted twin shock frame (cr 480 RC modified frame with fox shocks) with a twin leading shoe brake not be eligible?
Easy...the Maico is an exact replica of the 1981 model but the Honda you propose didn't exist in the day, and don't bring the works open class twin shock Hondas of the day into it, they were a totally different bike.

How does the YZ series fit in to evo if they never had twin shocks? can you race a 465G in Evo? what is the cut off for the YZ's
The Evo rules stipulate "no linkage" not "twin shocks". The YZ465G has no linkage so its legal. The H is the last Evo legal Yamaha.

Finally pre78 -  YZ D is the cut off correct? as they were 77 models and is methanol allowed in pre 78 MX because it was in 78 when I raced my 125D on Methanol (still have the carby with the jets ready to go in storage for 36 years!)
Methanol and the YZ-D are legal so enjoy yourself .

[Nathan S]

There is no age restriction on the Evo class, so there is no need for any sort of "carry over" rule.

I could take a 2013 KTM300EXC, mill the water jackets off, and fit some CNC-billet, hydraulicslly operated TLS drum brakes and it would be 100% legal for MA's Evo class, even at National Title level.

It would be an abomination that's entirely against the spirit of the rules, but it would be entirely legal.

[firko]

could take a 2013 KTM300EXC, mill the water jackets off, and fit some CNC-billet, hydraulicslly operated TLS drum brakes and it would be 100% legal for MA's Evo class, even at National Title level

And no scrutineer would ever pass it.

[John Orchard]

My understanding of Evo is any parts used on the bike must have come from another Evo type bike.  That's why I am using a '79 KDX400 (itself an Evo bike) engine in a KX250A5 Evo bike.

[matcho mick]

Vince,  Xl350 centreport frames different too,sorta slimline around seatnose area,i do have a spare sideport frame if you want to go there??,(good luck witha sideport head hunt though  ) ,

[Nathan S]

could take a 2013 KTM300EXC, mill the water jackets off, and fit some CNC-billet, hydraulicslly operated TLS drum brakes and it would be 100% legal for MA's Evo class, even at National Title level

And no scrutineer would ever pass it.

Based on the rule book, every scrutineer would have to pass it. The only arguments against would be weaker than "it's the vibe of the thing".

Same goes for the "CR480RZ"s, if you hold your tounge the right way.

Even the (rightly) despised twin shock RM500 (etc) conversions can be made Evo legal with a minor variation on the entry form.

It's a gaping hole in the rules, that hasn't yet been exploited because we are happy to adhere to the intent of the rule.

[firko]

Is anyone out there brave enough to argue this point with Nathan? I'm too old to let myself get trapped into a philosophical discussion that'll go on forever and I need to get out the shed anyway. 

[JohnnyO]

could take a 2013 KTM300EXC, mill the water jackets off, and fit some CNC-billet, hydraulicslly operated TLS drum brakes and it would be 100% legal for MA's Evo class, even at National Title level

And no scrutineer would ever pass it.

Based on the rule book, every scrutineer would have to pass it. The only arguments against would be weaker than "it's the vibe of the thing".

Same goes for the "CR480RZ"s, if you hold your tounge the right way.

Even the (rightly) despised twin shock RM500 (etc) conversions can be made Evo legal with a minor variation on the entry form.

It's a gaping hole in the rules, that hasn't yet been exploited because we are happy to adhere to the intent of the rule.

Thats all bullshit, it has to be period correct and none of the bikes you mentioned are.
Put your money where your mouth is and turn up to a title event with one and see how far you get!

[Simo63]

How does the YZ series fit in to evo if they never had twin shocks? can you race a 465G in Evo? what is the cut off for the YZ's
The Evo rules stipulate "no linkage" not "twin shocks". The YZ465G has no linkage so its legal. The H is the last Evo legal Yamaha.

Just a small addition here Mark and one I'm sure you're aware of. The 1981 YZ125H is (the first yamaha production MX'r) watercooled and therefore not Evo eligible whereas the YZ250H and YZ465H were still aircooled and therefore are evo eligible.

My understanding of Evo is any parts used on the bike must have come from another Evo type bike.  That's why I am using a '79 KDX400 (itself an Evo bike) engine in a KX250A5 Evo bike.

Wow .. I'm building exactly the same bike. KX250 A5 Frame with 1979 KDX400 Motor    Have been inspired by what Rusty (Holeshot Buddy) has and think it will be a sweet handling Evo open bike.

[firko]

Just a small addition here Mark and one I'm sure you're aware of. The 1981 YZ125H is (the first yamaha production MX'r) watercooled and therefore not Evo eligible whereas the YZ250H and YZ465H were still aircooled and therefore are evo eligible.

Correctomundo Simo.....I had a mental picture of the 465H in my head, totally forgetting that the 125H had a radiator . 125's aren't high on my list so I don't often think of them.

[Nathan S]

Thats all bullshit, it has to be period correct and none of the bikes you mentioned are.
Put your money where your mouth is and turn up to a title event with one and see how far you get!

What's the "period" for Evo, then?

To repeat the point for the 10,000th time: Evo is not defined by age, it is defined by technology. This means that a 2013 bike that meets the criteria is legal.

I'm not going to spend thousands of dollars building a bike that I don't want to own. 
You pay for it, and I'll be more than happy to enter it at any event you like.

[Nathan S]

This is not about philosophy, it's about what is written in the MA rule book.

[JohnnyO]

Nathan an Evo bike has to consist of parts from an Evo legal bike, cr500 and rm500 motors are not legal because the bikes they came from are not Evo legal bikes. Simple isn't it?
Just like YZ465 forks are legal on any bike in the Evo class but CR480 forks are not..