So I tried an outboard motor flusher/muffs on my 2000 Mercury 115 horse. It didn't work. I turned the added on 3/4 and full pressure and no water came out of the port. I had just ran the boat in the water the same day and it worked. I gave it roughly 10-15 seconds. Well, I turned it off right away and unhooked everything. Took it out to the lake a week later and it ran great. My friend says he has never has luck with the flushers and uses an 100 gallon stock tank. I was thinking about doing this also. However the tank costs about $72 while a flusher costs $6-$20. The flusher worked on my 9 horse so I know they work. I'm debating trying another pair of flushers (a dual flusher model) before I buy the tank.

What do you think?

I have a dual flusher which I use on my 225 Optimax and 9.9 Pro kicker, never had a problem. Also you want to put the water on full force. Also if I remember correctly some motors also have a spot under the cavitation plate where it sucks water from the lake, so it just doesn't suck it in, in just one spot. Mine does take several seconds maybe 10 seconds before the water starts spitting out. However your single sided muff may not be enough. Just my opinion.

 

 

I much prefer a stock tank over muffs. Mush better water circulation through motor. For things like that, I've never understood the math. How a $6 item that works half**s is better for protecting and taking care of an umpteen thousand dollar motor that a $100 item that works great. I guess it's all part of this new math I hear about them teaching in schools now.

I much prefer a stock tank over muffs. Mush better water circulation through motor. For things like that, I've never understood the math. How a $6 item that works half**s is better for protecting and taking care of an umpteen thousand dollar motor that a $100 item that works great. I guess it's all part of this new math I hear about them teaching in schools now.

 

 

Good point.

Muffs are meant to be used in conjunction with the engines water pump. You put the muff on, turn the water on, and then start the engine. I believe the recommended flushing time is 5-10 minutes at idle if you're flushing salt water. 

Yes you use them with the engine running but you still won't get near the flow and circulation through the engine that you get with the engine submerged in a stock tank. If you think so apparently you've never used a stock tank and paid attention to the difference in the volume of water coming out of the exhaust relief ports most engines have in the upper part of the mid section.

Yes you use them with the engine running but you still won't get near the flow and circulation through the engine that you get with the engine submerged in a stock tank. If you think so apparently you've never used a stock tank and paid attention to the difference in the volume of water coming out of the exhaust relief ports most engines have in the upper part of the mid section.

 

Chill out bro, I never said anything about your stock tank. I was trying to help OP out by letting him know that the engine had to be running for the muffs to do anything.