If you fly off of a hard surface you can probably get by with them. One of our regulars has one with twin Saito 30's and there have been days that it could not get in the air from our maincured grass strip. Do yourself a big favor and go bigger. 40 Saitos would be the smallest I would consider in 4-strokes. 30's do not have any extra power above what it takes to fly the plane. Two strokes would be a different story. I would go with 56's but the cowls are a pretty tight fit with the 30's.
FEB