Definitely check the steering stop. They tend to start cracking in the corners and peeling back. Many ways to gusset but something I would do before PC. I had a 86/44 ported stock cylinder from Redline and had him build me a 421 serval at the end of summer. It's the motor Zilla linked to you. I've had it in the sand, trails and mx track and it's by far the most fun 2 stroke I've ever sat on. Worth every penny.