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AKA Rotax Cylinder Addendum

The AKA issued rule addendum #45 recently, addressing and approving the new Rotax MAX cylinder. The new ruling is effective immediately and reads:

The Rotax Cylinder is passed for inclusion into the Snr Rotax Max Class.

Snr Rotax – Chpt 28 new wording

28.14 Combustion Chamber Insert

1. Identification code has to be 223389 or 223389 1 or 223389 2 (illustration 1, (4).
2. No material may be added except to repair the spark plug thread and or spark plug sealing surface. Machined surfaces may be re-machined only if using Cylinder 223997. Cylinder head insert must retain both the squish band and a visually spherical combustion chamber. O ring must be fitted
3. The combustion chamber/squish area shall not protrude beyond the sealing face of the cylinder head insert
4. "Rotax” and/or “Made in Austria” must be cast in the combustion chamber insert.
5. If using Cylinder 223996 or any future cylinder evolution, the combustion chamber insert must remain as supplied by the manufacturer. The profile of the combustion chamber insert has to be checked with the combustion chamber insert template (Rotax part no. 277390). The crack of light between the template and the profile of the combustion chamber insert has to be the same over the whole profile.


28.18 Cylinder

4. Cylinder has to be marked with identification code: 223997 or 223996 (illustration 2, (2))
4a. Cylinder 223997 is eligible for use in AKA competition until 31/12/2011.
9. If you are using Cylinder 223997, the cylinder base surface may be re-machined but must remain perpendicular to the cylinder bore.
9a.If using Cylinder 223996 or any future cylinder evolution, the cylinder must remain as supplied by the manufacturer and cannot be re-machined. Height of cylinder must be 87mm with a tolerance of -.05/+0.1mm.
11. The PTG measuring system will be the final conformity check of the barrel (stroke/exhaust port height/transfer split).

This and other AKA addendums can be found on the AKA site HERE.

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