Gentlemen I have a problem. it makes a good time the motor sometimes is squashed completely when it goes in one climbed, is samurai 2. I go to 4000 or 5000 rps hardly and lower completely rps. I have changed to several times the benzine filter and nothing to him. A test to the pump was done to him that goes in the pool, and also throws good pressure has washed to the pool and nothing. Single it happens to him sometimes. It is thanked for, some aid