Donny,
Unfortunately, most parts for the MK 2 are now depleted.

Is yours a welded case??
Twin plug??
Shrink wrap ECU??

Wren no longer offers these motors as a kit build.

The Wren 100 is now the motor of choice, as it comes in kero Start, and still weighs the same as the older MK2-3-4, has the same dimensions as far as installation...and now produces 22 pounds of thrust!!!

You could do an upgrade on the motor, but this would not be cost effective, and thrust would only increase by a pound or two!

Feel free to call me if you have any other questions @ 260-701-8936