The 26cc High Torque is discontinued, it was made obsolete by the Pioneer Engines. Parts and service are still available.
If for some reason you still want a side port High Torque, we can still build you one as a special order.
The rear exhaust High Torque is discontinued and it is not available. Parts and service for the rear exhaust High Torque are still available.
BRAND NEW HT cylinder castings are available for $200 with a new sleeve installed. That can be a standard stroke sleeve or for the +1mm stroke upgrade.
If you would like just the casting by itself (with no sleeve installed) that is available for $80.