Re: 9.9 Johnston Impellor change - how hard?
That is a 1982, so you should be mixing at 50 to 1. The impeller very well could be the problem, and is a good idea to change on any new motor to you. The manual along with this forum will help. When it is down, clean out the water intake area, flush the water line, and inspect the water pump for signs of damage which may need to be changed as well. Also clean out the tell tale hose and nipple, pesky little spiders like to nest in them. Good luck.