Wow a Schluter Mini-boy that is an old, old, machine like 20 years or so!

be careful, if you pop it, it's going to be difficult if not impossible to find parts.

Regarding stretching you Mini-Boy, I'm not sure your really going to achieve that much performance difference. Are you doing aerobatics with the machine - if not, I would just keep it stock and put some fuel through it.

Regards,

Mike Mas