Re: what to buy
The Nissan/Tohatsu 15 hp's do not shake any more or any less than any other 4-stk with similar CID. The weight of the 15 might be an issue as it is on the heavy side....but it's a de-tuned 18 hp. While the Honda is a well designed engine it is no more reliable, quiet, economical or smooth than a Suzuki, Yamaha, Mercury or Nissan/Tohatsu.