I installed my solas 12/18 impeller in my stx 12f and before i installed my impeller I had a lil vibration and now it makes a not much lowder but it is a vibration at mid rpm's is this normal it runs graet it really helped my alound performance.

This message has been edited. Last edited by: chris1229,

You need to find what's causing the vibration before riding any more. You could do some serious damage. Check the run out on your drive shaft to make sure it's perfectly straight.

Also, check the bearings in the pump and sub-shaft housing.

If all of the above are ok you should check the motor. Have an experienced mechanic help you.