I recently bought an OS52FS Surpass engine for the GP Ultimate 40 kit. Now I'm having second thoughts. Everything I've read indicates this model builds heavy, and every time I read that, I get those second thoughts on the 52.

What do you think about either staying with the OS52, going with a Saito 72 or a YS63? Or should I just mount a Saito 91?

I already own a Saito 91, but not the 72 or 63. The 63 is rated at 1.5hp, while the 91 is rated at 1.6hp; and the 91 is only .3oz heavier than the 63...so that's why I'm considering the 91.

Tell me what you all think.