Digital Edition Subscribers: Read Roadracing World Magazine Now >
Roadracing - An Online Service of Roadracing World Magazine
Sep 10, 2018

MotoAmerica: Proposed Technical Rules Changes For 2019 Released

Some motorcycles used in MotoAmerica Twins Cup will allowed to have over-bored engines in 2019. Photo by Brian J. Nelson.

AMA/FIM Technical Regulations for MotoAmerica

Proposed Rule Changes for 2019

2.3 General Junior Cup tire allocation

2.4 Superbike /e./ii. and f. Newly homologated machines (homologated after 2018) will not be allowed to make frame modifications to the steering head or swing arm pivot area. This does not effect currently homologated machines.

2.5 Supersport

1. No changes

2.6 Stock 1000 Swing Arm

 f. The sides of the swing-arm may be protected by a thin vinyl cover only; no composite or structural covers are allowed. Brakes

e. Front master cylinder may be replaced. Price capped.

2.8 Twins Cup

Once a motorcycle has been homologated, it may be used for racing in the corresponding class for a maximum period of twenty (20) years or until such time that the homologated motorcycle is disqualified by new rules or changes in the technical specifications of the corresponding class.

2.8.2 The following engine configurations comprise the Twins Cup class.

Over 600cc up to TBA 10/1/18 4 stroke 2-cylinder water cooled

Over 600cc up to 800cc 4 stroke 2-cylinder air cooled The minimum weight will be:

All machines 135 kg (297.6 lbs.) Cylinders

a. Cylinders may be bored to a maximum of 2 mm over standard bore or up to a maximum total displacement of 700cc, whichever is less. Machines with a standard displacement greater than 700cc must remain as homologated. Crankcase /Gearbox housing

b. Internal bolt on brackets and/or bracing may be added to the crankcase to increase strength however welding on the crankcase is not allowed. Frame body and sub-frames

j. The front and rear sub frame may be changed, altered or removed. If the rear sub frame is integral to the main frame, additional seat brackets may be added and non-stressed protruding brackets may be removed if they do not affect the safety of the construction or assembly. Rear sub frames that are integral to the main frame may be removed and replaced with a detachable sub-frame. Bolt-on accessories to the rear sub-frame may be removed.

2.9 Junior Cup 

2.9.3 Balancing various motorcycle concepts 

The MotoAmerica/FIM Commission reserve the right to apply balancing to the machines in the class as they see fit in order to maintain equality amongst machines. Methods may include but are not limited to the following: 

- rev limit 

- weight limit changes 

- restrictor plates/ throttle stops 

- engine and fuel injection power up kits 

The decision to apply the handicap will be taken by the MotoAmerica/Superbike Commission at any time deemed necessary to ensure fair competition. 

2.9.7 Tires 

Tire type: racing slicks 

Tire allocation