Bike class rules? Ambigouis or is it just me?

What exactly are the AMA bike classification rules? Big bike and lites. I see 250 2S racing 250'f in some cases. Are there race rules that are track specific allowing the track to pics what bikes are in what classes?

:thumbsup:

Here is an excerpt from AMA...

"In motocross only, new displacement limits would be applied to class 2 (100cc-144cc), class 3 (145cc-250cc) and class 4 (251cc and up). This means that both two-stroke and four-stroke motorcycles would be limited to the same maximum displacement and the limits would apply to A, B and C classes."

OK so this means 144's race with mini bikes? No way a 144 2S makes almost twiuce the power of a 150R. I thouhgt 144 was made to compete with the 250F's? Argggg, It was easier with 2 classes 125's and 250's.

Someone smarter than me clear this up for me please.

i think wheelbase comes into play for the smaller classes.

Hmm OK that makes sense. Then let's stick to big bikes.

What are the rules exactly for lites (used to me 125 class)

What are the rules exactly for big bikes(used to me 250class)

I found this...

MX Lites (100cc-153cc 2-stroke/151cc-250cc 4-stroke)

125 Class (86cc-125cc 2-stroke only)

Motocross (154cc-285cc 2-stroke/251cc-450cc 4-stroke)

250 Class (126cc-250cc 2-stroke only)

Open (251cc-500cc 2-stroke/390cc-650cc 4-stroke)

Displacements may be OEM or achieved by aftermarket modification.

Does not explain 250 2S racing 250F's though. Maybe non AMA? If so where do those rules come from?

125 Junior Lites/125 Jr./Schoolboy equals: 100cc-144 cc 2 stroke and 126cc-250cc 4 stroke ages 12-16.

Super Minis ages 12-up equals: 79-112cc two stroke and 75-150 four stroke

125 B/C equals: 125cc 2 strokes

250C and 250 B and 250A equals: 125cc-250cc

Open A/B/C equals: 125cc and up

14-24 equals: 125cc and up

250C and 250 B and 250A equals: 125cc-250cc

Pure displacment despite engine type then? Man I just do not see that in the AMA rules. Soo confusing whewre all this comes from.

Maybe I am looking at the wrong stuff. Got a link?

ohhhh i see how it is, It was ok when 450's were racing 250 2 strokes, but now that the shoes on the other foot, you guys dont like it?

On our local AMA District 23 circuit it's quite simple.

125 class, 122-125cc 2-strokes

250 class, 122-250cc 2-strokes or 4-strokes

Open class, 122-OPEN (where the 450s run)

And as far as I know that's how all the AMA Amateur stuff is being done.

What the hell are you talking about? I ride 2 strokes.

I am just trying to find what class to look into to race. The rules are really unclear is all. Not only that, everytime I get an answer it is differrent and none of the answers match what I see on the AMA site. Freaking frustrating.

On our local AMA District 23 circuit it's quite simple.

125 class, 122-125cc 2-strokes

250 class, 122-250cc 2-strokes or 4-strokes

Open class, 122-OPEN (where the 450s run)

And as far as I know that's how all the AMA Amateur stuff is being done.

Man I hope it is that simple. Now if I can only find an official AMA link verifying that. Thanks.

Found a link, says exactly what you said. But it says proposal. Maybe that is where I am confused. Everything is a proposal even ratified changes?

http://www.amadirectlink.com/rulebooks/OffRoadUpdates07.pdf

Thanks. Can't help but think a 250 2S is superior to a 250F. Last year KX250 made close to 50hp compared to the 250F's 35hp with a pipe.

Man I hope it is that simple. Now if I can only find an official AMA link verifying that. Thanks.

Trust me it is, anybody who has raced this year can affirm that. Here is the link to our sign up sheet showing the classes. http://armca.org/applications/2008_D23ARMCA_APP.pdf What is your local district? On the website it should have a sign up sheet like that so you can make damn sure it isn't different in your area for some reason.

Yep yep I found it. Thanks guys.

This is confusing. How 'bout these divisions?

Pro-Am 120-144cc two or four stroke

250cc 248-251cc two or four stroke

Open 251-650cc two or four stroke

Just some ideas. Opinions?

I was going to say then why bother with a 144 kit? are you saying there are "other" classes? Is that something other than Aamature? is there Amature, pro-am and pro? Different classes for each division?

That's fine is there one spot that lays it AAAAAALLLLLLL out?

Found a link, says exactly what you said. But it says proposal. Maybe that is where I am confused. Everything is a proposal even ratified changes?

http://www.amadirectlink.com/rulebooks/OffRoadUpdates07.pdf

Thanks. Can't help but think a 250 2S is superior to a 250F. Last year KX250 made close to 50hp compared to the 250F's 35hp with a pipe.

They proposed it, and for the 2008 race season it went through. And as far as the 250T vs. the 250F, they both have their advantages. The 250 has an advantage in straight up horsepower, but the 250F isn't all that far behind in straight up HP and is a good bit easier to ride. I don't know about those dyno numbers, I think most 250Fs are damn close to 40HP from the factory and most 250 pingers are about 45HP. If tested on the same dyno I strongly doubt you will see over a 10HP difference.

aaaahhhhhhhh( that is a scream)

http://www.amaproracing.com/prorace/pdf/MXSX%202008%20Rules.pdf

Says the following, which is differrent than pure 250 displacment rules talked about.

1.1 Engine Displacements

a. Motocross Lites / Supercross Lites Class

0 - 125cc 2-stroke

0 - 250cc 4-stroke

b. Motocross / Supercross Class

150 - 250cc 2-stroke

251 - 450cc 4-stroke

ARMCA? Is that different than AMA?

This is 2007, I wonder about 2008 though. Lookks like it is different for A abd B class. what about C class. Did not mention that. Maybe there is no C class?

http://www.amadirectlink.com/rulebooks/AmateurRules2007.pdf

A Classes Engine Size

1

0 - 110cc 4-stroke

Automatic (ages 12 and up)

*2

100cc - 144cc 2-stroke

126cc - 250cc 4-stroke

*3

145cc - 250cc 2-stroke

251cc - 450cc 4-stroke

4

251cc - 500cc 2-stroke

390cc-650cc 4-stroke

*By boring only stroking is not allowed.

*144cc achieved by boring only on homologated 125cc OEM machines

B Classes Engine Size

1

0 - 110cc 4-stroke

Automatic (ages 12 and up)

*2

100cc - 144cc 2-stroke

126cc - 250cc 4-stroke

*3

145cc - 250cc 2-stroke

251cc - 450cc 4-stroke

4

251cc - 500cc 2-stroke

390cc - 650cc 4-stroke

* By boring only stroking is not allowed.

*144cc achieved by boring only on homologated 125cc OEM machines

2008 says the following.If that is true, they sure make sweeping changes from year to year.:thumbsup:

Can I assume that if they do not specifically mention 2 Stroke then is is just displacment regardless of stroke?

All classes may be divided into A, B

and C skill levels at the promoter’s discretion.

CLASS - NAME DISPLACEMENT

125cc - 122cc - 125cc 2-stroke

250cc - 122cc - 250cc

Open - 122cc - Open

14-24 years - 122cc - Open

Plus 25 - 122cc - Open

Vet Plus 30 - 122cc - Open

Vet Plus 35 - 122cc - Open

Senior Plus 40 - 122cc - Open

Senior Plus 45 - 122cc - Open

Senior Plus 50 - 122cc - Open

Yep you are absolutly right. Thanks for pointing that out. That is where I got the 2008 information in the bottom of tha last post. I am all clear.

I'll say it again though, they sure make sweeping changes from year to year.

Wow, why bother with a 144 2s now. Just ride a 250 2S. dang I was gonna do the 144 thing too. lol.

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