Notices

Yamaha 250 question

Old 09-05-2010, 04:11 PM
  #1  
hlb
Senior Member
Thread Starter
 
Join Date: Feb 2008
Location: kenly,n.c.
Posts: 392
Default Yamaha 250 question

Bought a 09 250 with 52 hrs. on it. When we ran the boat and motor it had no problems. Spent today doing maintaince on the boat ie: washing . waxing, and just giving it a good cleaning. Hooked the muffs to the motor cranked motor and after about 30 seconds or maybe a little longer motor wasn't peeing. Shut it down and hooked hose to flush port on the motor and water ran out of pee hole great but did not crank the motor. Hooked muffs back up cranked motor and nothing. This is the first Yamaha I have owned and the most h.p. Always had a Mercury with 115 or 150 and when you hooked up the muffs you had water in just a few seconds. Should you not hook muffs to a 250 and run or does it just take longer because of the motor size? Read the owers manuel and it said nothing about using muffs only talks about the factory connection. Like a new dad i don't want to hurt my baby.
hlb is offline  
Old 09-05-2010, 05:48 PM
  #2  
Admirals Club Admiral's Club Member
 
Join Date: Oct 2008
Location: Ocean City, MD
Posts: 881
Default

They never pee on the muffs. You need to submerge the lower unit if you want it to pee.
bigk23surf is online now  
Old 09-05-2010, 06:42 PM
  #3  
Senior Member
 
Join Date: Oct 2007
Location: Tallahassee, FL
Posts: 568
Default

Don't run an F250 on muffs unless you cover the front inlet, or you'll just burn up your water pump. Most of the water just runs out the front. It's better to submerge the who unit in water.
Florida R227 is offline  
Old 09-05-2010, 06:53 PM
  #4  
hlb
Senior Member
Thread Starter
 
Join Date: Feb 2008
Location: kenly,n.c.
Posts: 392
Default

Thanks for the info. Do you think I may have done any damage today for that short amount of time?
hlb is offline  
Old 09-05-2010, 06:54 PM
  #5  
Member
 
Join Date: Feb 2005
Location:
Posts: 66
Default

Place duct tape over the front inlets prior to running water through the muffs. Yamaha added the front lower unit inlets due to cooling issues years back. After covering the inlets, place the muffs over the central inlets , turn of the water and fire the engine off. The engine will then PEE when the therms open.
hwbjr is offline  
Old 09-05-2010, 06:59 PM
  #6  
TSA
Senior MemberCaptains Club Member
 
Join Date: Nov 2007
Location: St Pete/Islamorada
Posts: 6,123
Default

hwbjr is correct. my particular f250 also requires a bungee cord wrapped around the muffs to get enough pressure to make it pee.

the garden hose flushing port is easy, but it doesn't get water high enough in the motor to flush the T-stats. running the engine on the muffs does.
TSA is offline  
Old 09-05-2010, 07:28 PM
  #7  
Admirals Club Admiral's Club Member
THT sponsor
 
triumphrick's Avatar
 
Join Date: Aug 2008
Location: Masaryktown, Fla.
Posts: 17,192
Default

Very, very few complaints from anyone who owns these motors. As you have learned, they don't pee well on just muffs, and ditto the tape of the intake. Also, never run one on the flush port.
Andy over at SIM will certainly become your friend, here. There are several posts concerning the general maintenance if you so desire. He is very Yamaha knowledgeable and will probably chime in and help to remove your fears...
triumphrick is offline  
Old 09-05-2010, 07:37 PM
  #8  
Admirals Club Admiral's Club Member
 
Join Date: Apr 2009
Location: Florida
Posts: 16,804
Default

tape over the lower holes, make sure you use bungee to keep ears tight over upper holes.

Anyone who says they don't pee on the muffs doesn't set the muff up properly.
OldPete is offline  
Old 09-05-2010, 08:40 PM
  #9  
Senior Member
 
Join Date: Aug 2010
Posts: 552
Default

I use a large plastic tub that you can get at a hardware store. It's about the size of a large igloo. It works, as long as it is deep enough to submerge the lower unit.
DrewC is offline  
Old 09-06-2010, 04:26 AM
  #10  
Admirals Club Admiral's Club Member
 
Join Date: Apr 2009
Location: Florida
Posts: 16,804
Default

Originally Posted by DrewC View Post
I use a large plastic tub that you can get at a hardware store. It's about the size of a large igloo. It works, as long as it is deep enough to submerge the lower unit.
I've looked for that tub... which one?
OldPete is offline  
Old 09-06-2010, 05:23 AM
  #11  
Senior Member
 
Join Date: Oct 2007
Location: Tallahassee, FL
Posts: 568
Default

I use a Galvanized horse trough I bought at a Farm Store. I couldn't find anything else big enough.
Florida R227 is offline  
Old 09-06-2010, 05:35 AM
  #12  
Senior MemberCaptains Club Member
 
Join Date: Nov 2007
Location: South Mississippi
Posts: 1,516
Default

I use my garbage can, the kind you roll out to the street with a swinging lid, and yes I clean it first.
swampu is offline  
Old 09-06-2010, 06:07 AM
  #13  
Senior MemberCaptains Club Member
 
Join Date: Jun 2006
Location: Beach Haven West, NJ
Posts: 2,022
Default

My F250 pees on the muffs but not nearly as strong as it does when it's in the water. As mentioned, thoroughly tape off the forward intakes on the leading edge of the bullet. I use shrink wrap tape. If you don't all your water will just run right out of them and not make it up to the water pump.

The best muffs to use are the large round ones with the metal rod that runs through the lower unit intakes to a tensioning device on the opposite side. They give a much tighter fit and minimal water loss.

Come to think of it, my motor did not pee on conventional muffs...too much water loss out the sides of the muffs. It was when I switched to the muffs that I mentioned above that I got an acceptable stream.

If you only ran it for just 30 or so seconds, I doubt that you did any damage. Just 'cause it's not peeing doesn't mean that no water is getting to the pump. Just not enough for sustained running.
jack14 is offline  
Old 09-06-2010, 06:26 AM
  #14  
Senior MemberCaptains Club Member
 
Join Date: Feb 2005
Location:
Posts: 13,052
Default

Keep in mind that not all F250's have the forward lower set of water inlets. The early models did not. While this is stated to be an 09 model (no such thing really) maybe the gear case has been changed back to the early style.

Water coming from the tell tale has nothing to do with the thermostats being opened or closed. Water is bypassed at the base of the block, before it goes through the motor, and sent to the tell tale port.

The problem is that the tell tale water goes through a fuel cooler, the rectifier regulator and a number of hoses before it can get to the outlet port. All of this is a restriction to flow and causes a pressure drop. Zilch water pressure results in zilch water flow out the tell tale.

Yamaha makes a set of muffs that cover both sets of water inlets so that water can be directed to both at the same time. Andy at SIM has them.
jethro1 is offline  
Old 09-06-2010, 06:54 AM
  #15  
hlb
Senior Member
Thread Starter
 
Join Date: Feb 2008
Location: kenly,n.c.
Posts: 392
Default

Thanks for the heads up. I will get in touch with Andy and get a set.
hlb is offline  
Old 09-06-2010, 02:59 PM
  #16  
Senior Member
 
Join Date: Aug 2010
Posts: 552
Default

Originally Posted by OldPete View Post
I've looked for that tub... which one?
It's a Rubbermaid - bought it a long, long time ago. I think they sell one now like it called the Jumbo - it's 30 gallons or so.
DrewC is offline  
Old 09-06-2010, 06:27 PM
  #17  
Senior Member
 
Join Date: Apr 2009
Location: Waste-N-Away in Mobile, AL & Pensacola, FL
Posts: 4,391
Default

i run my hose through a garden hose splitter, then one hose can go to the muffs and one can go to the washdown inlet, did the same way my old hondas, and mercs. never had any problems, well problems with the mercs but not b/c of the wash down
bhales is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread