Hey folks, I'm new here and have a question. I am building a xs650 hardtail and have a choice between a 72 and a 78 motor. The bike is the 78, but I believe the non titled xs2 I have has a better motor. My question is, which is a better motor.? Or what are the pro and cons . The 72 has the pressure release. I don't know if that's a pro. There the nostalgia of the 72. Keep in mind that both motor may need work and in the mean time I'm still looking for a know good engine I can buy cheep. I'm just sick of waiting for the right bike . I have a titled 78 which I believe is a good platform from what I've read so I'm gonna start there . Let me know your thoughts. And or any info I could add to aid your opinion. Thanks