New Restrictors Required for Animals April 1, 2012

The original restrictor plates manufactured by Horstman are no longer available for either engine. The new plates are available through APS or your local dealer. There are some changes to both versions most notably the Flathead plate. The restrictors must have APS/IKF on the restrictor plate.

Part numbers are:


Black Plate: AP5666    3  .250" holes

Gold Plate: AP5660     3  .312" holes



Blue Plate: AP 5689    1   .440" hole

Red Plate: AP5690      1   .530" hole