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Discussion Starter · #1 ·
The following is a general overview of the rules changes effective January 1, 2004 for all classes in the 2004 AMA Chevy Trucks U.S. Superbike Championship.


SUPERBIKE

Fuel injection throttle bodies:

Multi-cylinders – Restricted to stock throttle bodies and air intake boxes.

Twin-cylinders – In addition to the stock throttle bodies, one alternate, AMA-approved throttle body type/set is permitted as well as aftermarket air intake boxes.

Engine modifications:

Multi-cylinders – Limited modifications are permitted but such items as stock camshaft lift, stock valve sizes and lightly-modified stock crankshafts are required.

Twin-cylinders – The same limited modifications as multi-cylinders are permitted except for the following items:

Valve sizes and material are unrestricted.
Camshafts are unrestricted.
Gearboxes:

Multi-cylinders – In addition to the stock set of gear ratios, one alternate, AMA-approved set of ratios is permitted. Primary drive ratios must remain stock.

Twin-cylinders – The same rules as multi cylinders apply.

Frame:

Multi-cylinders – Limited modifications to the stock frame are permitted such as gusseting for additional strength.

Twin-cylinders – The same rules as multi-cylinders apply.

Minimum weight:

Multi-cylinders – The minimum total motorcycle weight (less fuel) is 370 lbs.

Twin-cylinders – The same 370 lbs. minimum weight applies.



SUPERSPORT

Supersport remains unchanged with only clarifications of existing regulations.


FORMULA XTREME

1. Regulations for Formula Xtreme multi-cylinders and liquid-cooled twins are the same as the 2003 Superbike multi-cylinder rules with the following exceptions:

A. Displacement range for multi-cylinder four-stroke motorcycles is reduced to 450cc-600cc.

B. Twin-cylinder, liquid-cooled four-stroke motorcycles displacement range is 595cc-750cc.

C. 850cc-1350cc air-cooled four-stroke twins are permitted with unlimited modifications (only applicable eligibility requirements, homologation and general equipment standards apply).

D. Stock throttle-body assemblies are required on multi-cylinders and liquid-cooled twins. Throttle-body assemblies include the following controlled components:

Intake bore castings and associated housings
Butterfly valves and shafts
Fuel rails
E. Fuel injectors may be replaced with aftermarket units provided the original mounting locations are maintained and no modifications are made to the throttle-body assemblies for injector fitment. The total number of installed injectors must be the same as originally produced.

Secondary butterflies may be securely fixed in the open position.
All other fuel injection system components may be modified or replaced with aftermarket items.
F. Stock intake air boxes are required with only the following modifications permitted:

Air filters, internal flap-type valves, sensors and vacuum fittings may be modified, replaced with aftermarket parts or removed. Any holes in the air box to the outside atmosphere or to the inside of an intake tube resulting from the removal of components must be completely sealed from incoming air. All incoming air must pass through the original, unmodified air box inlets.
Ram-air tubes or ducts may be modified, replaced with aftermarket parts or removed. If tubes/ducts are utilized, they must be attached to the original, unmodified air box inlets.
Velocity stacks may be modified, replaced with aftermarket parts, or removed. The only modification permitted to allow alternative velocity stack fitment is the removal of internal debris deflectors.
G. Stock fuel tanks are required on multi-cylinders and liquid-cooled twins. Fuel fillers, fuel valves and fuel pumps may be modified or replaced with aftermarket units. Tanks may be modified only to permit the installation of these components.

H. Bodywork may be modified or changed to any aftermarket or custom type as long as “fluid retention” regulations and general equipment standards are adhered to.

I. DOT street legal or street-type tires are not permitted.

J. The minimum weight limit for all motorcycles is 350 lbs.

2. Motorcycle Entry Restrictions

A. Motorcycles entered in Supersport are not permitted in Formula Xtreme. The VIN number or an AMA frame sticker number is used for identification. A Supersport-entered motorcycle can be changed to Formula Xtreme only before the first official practice begins. A substitute motorcycle, not entered in Supersport, may replace a Formula Xtreme-entered motorcycle at anytime during the meet.

B. Damaged frames may be replaced and re-registered as a proper entry under the direction of the Chief Technical Inspector.



SUPERSTOCK

1. Displacement range is 745cc-1000cc for all motorcycles. Single-cylinder motorcycles are not permitted.

2. 1350 air-cooled twins are no longer permitted.

3. All eligible motorcycles must be homologated per current procedure.

4. DOT street-legal or street-type tires are not permitted.

5. Rider Entry Restrictions

A. Riders, who are employed or otherwise contracted by motorcycle manufacturers or their distributors as manufacturers’ team members, may enter either Superbike or Superstock but not both. Determination of genuine manufacturers’ teams and their riders will be at the sole discretion of AMA Pro Racing.

B. Manufacturers’ team Superbike or Superstock riders are not restricted from entering Formula Xtreme and/or Supersport.

C. Manufacturers are required to submit a list of their team riders who are subject to these restrictions to AMA Pro Racing. Additional documentation may be required for verification purposes. Any attempt by a rider, team or any other participant to circumvent the intent of this restriction may result in eligibility and/or license suspension.
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Well looks like the 636 got screwed out of formula extreme series to. Originally it was 400-650cc, and now it was downgraded which blows. Oh well, at least it had 2003 to open a can of whoop ass.
 

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that sucks[xx(] why did they do that. they just don't want kawi to win[}:)]
 

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WTF?! no more 600 superstock?! thats a load of crap
thats one of the hottest racing around cause it almost directly parallels with sales
bloody hell [}:)]
 

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Originally posted by spartan 116
WTF?! no more 600 superstock?! thats a load of crap
thats one of the hottest racing around cause it almost directly parallels with sales
bloody hell [}:)]
There is still 600 supersport if thats what you meant.

BD
 

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Discussion Starter · #5 ·
Originally posted by Big Daddy
Originally posted by spartan 116
WTF?! no more 600 superstock?! thats a load of crap
thats one of the hottest racing around cause it almost directly parallels with sales
bloody hell [}:)]
There is still 600 supersport if thats what you meant.

BD
Indeed. My post was relecting the changes made to formula extreme 600 series. See they change supersport from 750-1000, but thet left the 636 only in the formula extreme which was 400-650cc. But now they changed that so the 636 has no home. :(
 

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I wouldn't be so down on the new rule changes. To be honest, I like the whole concept.

Yes we lose the very competitive 750 Superstock class for '04, which may very well have been the best fought series ANYWHERE in 2003. However, let's be honest here. It involved one bike, the Suzuki GSX-R750. Because Kawi was able to prove the smaller-displacement 636 competitive was a fantastic addition to the series (and truthfully Tommy collected more points than ANY 750 did by a healthy margin were it not for the penalties assessed following technical inspections...) But in the end, there was really only one bike the series made sense for.

On the OTHER hand, the new 600cc formula extreme series is going to be fantastic. I've always wondered about 600 cc bikes with far less restricted modifications and race tires being able to run the same tracks as the big bikes. Think how you'll be able to compare heavily modded 600's to more stock liter bikes on the tracks (the new Superstock class) the AMA runs. Basically, to me, you have got a 600 stocker class and a 600 modded class, and an open class stocker and modded as well. Which is fun to compare at different tracks the lap times and qualifying times between them to see what kind of gap exists at each one. Plus, we'll get to see how far off the superbike times a stock liter bike is capable of with street-bias tires.

I say wait and see how the season shapes out before ya go gettin' too upset. Might be for the better.
 
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