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I have a 200 HP 2 stroke Yamaha motor that recently bought. I flush the motor after every trip by connecting hose to back of the motor and running motor through the system. My question is:
Is the motor supposed to be running while I'm doing this?
Yamaha dealer said no (especially not without muffs) and my local dealer said yes that it is better to have the motor running.
Who do I believe. It's a used motor in great shape and I would hate to ruin it out the gate.
I Agree with Glen .. I never run my engine with the hose attached to the engine, Only with the Muffs do I ever run the engine.. not sure what you local dealer is telling you.. check you owners manual , it is clear on the use of the hose port and the muff attachments. I really don't know what it will do if you run the engine, but why take the chance.
Thanks guys for your help. On another note and since this is my first boat, I was wondering if I could get any suggestions or advice on trimming out my motor. I know it is different for every boat. I have a 21 ft'r with a 200 HP like I said and I am trying to be most efficient on my gas and get best performance from the boat. What is a general run of thumb for trimming your motor when increasing speed from a dead stop.
As long as you menetioned trim, I would advise you get and check the owner's manual about flushing. Many Yamahas including my old 200 SWS, when using the hose attachment, are to be flushed in the up position, that is, out of the water. If running on muffs then the motor should be down.
tuck motor in all the way coming out of the hole. when boat starts to lay down, then begin to trim engine up to wherever your boat runs and plains best. experiment with trim indicator(if you have one) and tachometer together to find the sweet spots of your boat at different speeds and rpm;s.
Wow. I was shown by the dealer to hook hose to motor hose connector and then start. Nobody ever said that you coulld flush with same success without ever starting. I assume there is no damage by starting or is there. I watched the dealer do this more than once by more than one person? I guess I will call a different yamaha dealer in the morning. This is a bit concerning.
Wow. I was shown by the dealer to hook hose to motor hose connector and then start. Nobody ever said that you coulld flush with same success without ever starting. I assume there is no damage by starting or is there. I watched the dealer do this more than once by more than one person? I guess I will call a different yamaha dealer in the morning. This is a bit concerning.
screw calling a dealer - get out your owners manual and call yam customer relations -and get the straight story...but they should not be run when using the hose connector
I will be calling Yamaha first thing in the morning. Thanks THT. I will be also adding a wheel in the evening. I need another long sleeve shirt, those are nice.
Running the motor with the flush hose will by pass the water pump, which means it will not get any lubricant form the water. If you run the motor use the muffs. With that said you are not flushing the pump if you use the flush hose, so the only way to be sure you are flushing the pump is with the muffs.
Ed
seahorse, i have a f115 and the manual says not to run the engine if using the hose connector.BOTTOM LINE. these dealers that say run the engine while using the connector, need to go back to school or buy all of their employes a new set of glasses so they can read their manuals.
the biggest problems is most dealer techs have Huge egos that love to go shooting off their mouths on the slightest thing. Yes, there are great ones but most do no like to be trainined and think they know it all because they heard it from someone a long time ago. Go on a search for a tech that is like your doctor - someone you trust, someone who gets trained, does not feel he is infallible, does not talk down to you and goes out of his way to take care of your engine. They're out there but you need to interview for them. Once you find one, stay with him....
And still check with the Mfr Cust relations hotline and the owners manaul when in doubt.
listen to Glenn and others here VERY closely...and welcome to the marine world where some (and I emphasize some) dealerships employ rooky mechanics who continually give un-suspecting customers bogus advice.
read owner's manual, shop manual and call customer service. if their guidance conflicts with what the dealer's mechanic told you, report this to the factory so they can attempt to set the offending dealer straight. this happens all too often I am afraid
If I'm leaving my boat in water overnight, only to be put in storage the next day, do I 1) still need to flush the motor and 2) do I bring the motor out of the water
Yamaha Dealer vs. Local Dealer 
but why take the chance. 
