Starting Yamaha 4stroke

[furby]

Hello all,when I started my 50 hp 4stroke yam after the winter lay up, I noticed that the motor was running for maybe 1minute before the telltale started spouting water,this water was slightly warm [lukewarm only].the motor started first turn and ran perfectly but I would like to know if the cooling water behaviour is normal?. Thanks to all.

[9D280]

First thing I wouldn't expect instant telltale from any "dry" engine - if you can imagine the pump at the bototm of the leg needs to fill the pipe and normally a good chunk of the head before the water reaches the telltale hole.

Warm - probably - the water meets the now warmed metalwork. (any Yam 2-stroke I have used the telltale comes from near the "discharge" end of the passages, so will have been warmed on the way round whilst cooling the head. On my Merc the first thing the water meets is the telltle so it always runs cold. (and still takes about 20-30 seconds to start splurting water out)

Having said that, did yours squirt instantly before you laid it up for the winter?

I personally wouldn't worry too much, but probably worth getting the pump changed whatever happens.


Can any Yam owners confirm / correct what I just said?

[matt h]

sounds ok, a tad slow but keep your eye on the power of the water exit

[jyasaki]

Was this on muffs or in the water (sea, lake, river, or bucket)?

Often not enough water pressure on muffs to get an instant (well, quick, anyway) telltale stream.

If it comes up to "normal" telltale flow, I wouldn't worry too much about it.

jky

[chris.moody]

I use several boats with Yamaha engines and the tell tales often take ages before they start flowing. It was a bit worrying the first time I used them, until I mentioned it to the owners and they said "it's always been like that".

[paddlers]

My old Yam 85 took ages on muffs but was a lot quicker in a tank. The main thing is to get a good stream of water once it's running. If it's a bit feeble I'd check the impeller ! The water never seemed very hot.

[furby]

i cant say if it was always like this,never noticed it before.The motor was started in a big bin type thing,and when the telltale started, it was a strong stream of lukewarm water.I left it run for 10 minutes maybe and it remained the same temperature and strength.Maybe the cooling water has to reach a certain temperature before a thermostat or something opens to allow the water to exit through the telltale?I was watching the guages and all was normal during this time.Iwill keep a close eye on this when I next launch to see if the same thing happens and if there is any difference when starting engine from hot,as regards time taken to see telltale.Again i would like to thank all for their wisdom on this matter.

[hobnob]

Originally Posted by 9D280

First thing I wouldn't expect instant telltale from any "dry" engine....

Can any Yam owners confirm / correct what I just said?

Well my Yam 8 gets a tell-tale within 1-2 seconds of starting, every time.

My Yam 100 V4 takes 3-4 seconds.

[furby]

Launched today,and noticed the telltale started after approx 2 seconds.There is a good strong stream of water and it is definitely slightly warmer than the sea.Engine ran perfectly.Happy days and thanks to all.

[Wee Dafty]

I have found this before after a winter lay up from a season in salt water. If the engine is not flushed through properly then salt can crystalise in the pipework and it takes a bit of time to break down. All good after that though.

[Boatnomad]

Originally Posted by Wee Dafty

I have found this before after a winter lay up from a season in salt water. If the engine is not flushed through properly then salt can crystalise in the pipework and it takes a bit of time to break down. All good after that though.

Little bit of wire in the telltail-outlet works a treat,