don't expect high RPM out of it tho, i went from a 13x4 to a 12x6 and it just didnt rev any higher. it's happy on the 13x4 or 13x4W and thats about it.. you cant put it in a sport plane and under prop it for a few more revs, it's a torque monster and thats it, ported for grunt
mines been back twice, once coz the circlip jumped ship ( can happen to any engine ) second time coz the conrod that replaced the old in the rebuild was a Webra reject that they sent over anyway in a spares shipment. Weston have rebuilt and shipped back FOC everytime, great service. The West 50 is a great engine despite my bad luck.