Popping noise under load

[Hawklakebenny]

I'm wondering if anyone has had this problem before? We have noticed under full load we are getting a loud popping/gurgling  noise coming from the engine area. We have a 2014 sl20 with a 70hp Yamaha. Under light load there is no popping noise. Only when loaded. I took a video of it, but the wind made it hard to hear. 

 

[adkboater]

Bushing in the prop?? Depending on the safety mechanism for when hitting something, maybe that's the noise. Can you feel it thru the boat or just heat the noise?? Could also be something loose bagging a toon while you're under load?

 

[myv10]

When running under load, check water coming out of motor. It should be a strong stream. It is possible the water pump impeller is worn. The motor could be over heating and that could be the noise you hear.

 

[Hawklakebenny]

It has 62 hours on the engine, prop is in good condition, has not hit anything. Will have to wait till spring for the dealer to hear it.  Just thought you guys might have experienced it here.