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Author Topic:   Running 150 HP Etec on muffs

BBS posted 07-27-2009 01:57 PM ET (US)
My dealer told me the easiest way to flush the engine is on muffs. I don't know if I am not getting a good seal (my muffs have a rectangular rubber pieces about 6" x 3")but I am having a hard time getting water to come out of the tell-tale. Would a differently designed (round?) set of muffs help? I like starting the engine in the driveway - it is cooler than backflushing with the hose attached.
Tohsgib posted 07-27-2009 03:14 PM ET (US)
Those square muffs suck. Get a cheapo set of round ones for $7.
macfam posted 07-27-2009 10:28 PM ET (US)
Those rectangular muffs turn/rotate to match up with your intakes.
I've always found them to be fine on my 250 hp Yamaha.
TransAm posted 07-28-2009 08:59 AM ET (US)
I will second the suggestion the rectangular muffs SUCK. I have bought several different, more expensive rectangular muffs and none will allow water high enough to come out the pee hole. The cheap round ones work the best.
Peter posted 07-28-2009 09:35 AM ET (US)
Third recommendation for the round muffs. I have both and the rectangular muffs don't work well, particularly with the Magnum gearcase that the 150 E-TEC has.
hauptjm posted 07-28-2009 12:39 PM ET (US)
Does the E-Tec not have a direct access port for a conventional water hose? I've always used this method on my 1995 OMC 150hp motor, and it has worked fine. Is there supposed to be an advantage to using muffs versus this access point? My motor runs exclusively in salt water, and I have had no adverse effects whatsoever. I don't even see a convenience advantage to using muffs over the port: it takes all of 1 minute to attach and let her rip!
Peter posted 07-28-2009 01:34 PM ET (US)
They do have the flush port but my understanding is that you can't use the quick connect flush attachment with the 2.6L V6. So the flush port is probably no more convenient than muffs, perhaps even less convenient.
BBS posted 07-28-2009 01:45 PM ET (US)
The connection port for the water hose flows water backwards from the pee hole (at least that is what has the threads to screw the hose in). I found when you do it this way very little water comes out of the exhaust port on the prop - at least not enough to make me feel like it is getting a good flush. Plus, I believe you are not supposed to run it when it is connected directly to the hose as the water is flowing backwards.
I stopped and picked up a circular pair and they worked fine. I guess the rectangular ones don't have a strong enough seal around the lower unit.
number9 posted 07-28-2009 02:11 PM ET (US)
Correct do not run motor using just flushing port.
Tohsgib posted 07-28-2009 03:08 PM ET (US)
Read your owners manual. Many engines you can run it while on the port as long as engine is vertical.
stefan posted 07-31-2009 01:14 PM ET (US)
nick is right, as long as engine is vertical, it's ok
rong posted 08-03-2009 01:12 AM ET (US)
For the folks having issues with the motor peeing. On newer Yamaha's there is a little hole near the water intake. Only with square muffs will you be able to cover the intake plus the little hole. If you cover both...your engine will pee with a crack of city water pressure. My 98 40hp and 04 115hp have that hole near the water intake.

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Author	Topic: Running 150 HP Etec on muffs
BBS	posted 07-27-2009 01:57 PM ET (US) My dealer told me the easiest way to flush the engine is on muffs. I don't know if I am not getting a good seal (my muffs have a rectangular rubber pieces about 6" x 3")but I am having a hard time getting water to come out of the tell-tale. Would a differently designed (round?) set of muffs help? I like starting the engine in the driveway - it is cooler than backflushing with the hose attached.
Tohsgib	posted 07-27-2009 03:14 PM ET (US) Those square muffs suck. Get a cheapo set of round ones for $7.
macfam	posted 07-27-2009 10:28 PM ET (US) Those rectangular muffs turn/rotate to match up with your intakes. I've always found them to be fine on my 250 hp Yamaha.
TransAm	posted 07-28-2009 08:59 AM ET (US) I will second the suggestion the rectangular muffs SUCK. I have bought several different, more expensive rectangular muffs and none will allow water high enough to come out the pee hole. The cheap round ones work the best.
Peter	posted 07-28-2009 09:35 AM ET (US) Third recommendation for the round muffs. I have both and the rectangular muffs don't work well, particularly with the Magnum gearcase that the 150 E-TEC has.
hauptjm	posted 07-28-2009 12:39 PM ET (US) Does the E-Tec not have a direct access port for a conventional water hose? I've always used this method on my 1995 OMC 150hp motor, and it has worked fine. Is there supposed to be an advantage to using muffs versus this access point? My motor runs exclusively in salt water, and I have had no adverse effects whatsoever. I don't even see a convenience advantage to using muffs over the port: it takes all of 1 minute to attach and let her rip!
Peter	posted 07-28-2009 01:34 PM ET (US) They do have the flush port but my understanding is that you can't use the quick connect flush attachment with the 2.6L V6. So the flush port is probably no more convenient than muffs, perhaps even less convenient.
BBS	posted 07-28-2009 01:45 PM ET (US) The connection port for the water hose flows water backwards from the pee hole (at least that is what has the threads to screw the hose in). I found when you do it this way very little water comes out of the exhaust port on the prop - at least not enough to make me feel like it is getting a good flush. Plus, I believe you are not supposed to run it when it is connected directly to the hose as the water is flowing backwards. I stopped and picked up a circular pair and they worked fine. I guess the rectangular ones don't have a strong enough seal around the lower unit.
number9	posted 07-28-2009 02:11 PM ET (US) Correct do not run motor using just flushing port.
Tohsgib	posted 07-28-2009 03:08 PM ET (US) Read your owners manual. Many engines you can run it while on the port as long as engine is vertical.
stefan	posted 07-31-2009 01:14 PM ET (US) nick is right, as long as engine is vertical, it's ok
rong	posted 08-03-2009 01:12 AM ET (US) For the folks having issues with the motor peeing. On newer Yamaha's there is a little hole near the water intake. Only with square muffs will you be able to cover the intake plus the little hole. If you cover both...your engine will pee with a crack of city water pressure. My 98 40hp and 04 115hp have that hole near the water intake.