Yamaha 50hp 1999 - starting with difficulty when cold
My 1999 50hp HEDOL outboard struggles to start when cold. Once warmed up it starts very easily however. When i try to prime the engine by squeezing the primer bulb, the bulb goes hard on the first squeeze and then cannot be squeezed again easily. I have unplugged the fuel line from the engine and pumped the primer bulb whilst holding in the little ball and fuel squirts out and i can then pump it easily. I connected the fuel line onto my other engine and it seems to work fine there so not a fuel line problem. Must be problem with fuel pump/carbs?????
Re: Yamaha 50hp 1999 - starting with difficulty when cold
They did the carbs, although i cannot comment as to how well they were done! I have a racor fuel filter / water trap and have changed this too - or do you mean the small filter on the engine itself?
When you say the primer, i take it that you mean the primer bulb in the fuel line from the tank to the engine. I have tested this with the fuel line disconnected from the engine and it seems to pump fine.
One thing i do notice is that when i try to prime the engine before starting, the primer bulb goes very hard after only one squeeze. It feels quite different to the other side.
Re: Yamaha 50hp 1999 - starting with difficulty when cold
Pretty sure. I replaced the male (engine) side fitting as the pin felt stiff. Made no difference though.
The dealer called me yesterday and i went to see him. He says that they checked the electrical primer and that it is working fine. Stripped the carbs again. Said that there was a little water in the carbs. Not sure how this got there as i have good water traps installed.
Not sure where to turn next. It is really difficult to fault find as once the engine starts, it will then start perfectly all day. It is only if it stands for a couple of days that it then struggles.
Re: Yamaha 50hp 1999 - starting with difficulty when cold
After running for the day before storing the motor for a couple of days you should unhook the fuel line and run the engine untill it dies so all the fuel is out of the engine .....
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Re: Yamaha 50hp 1999 - starting with difficulty when cold
Well it will prevent 2-stroke oil from gumming up you carbs .......... what your problem is concerned .... try running it with some fuel system cleaner and see if the condition becomes better ......
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Re: Yamaha 50hp 1999 - starting with difficulty when cold
The only other suggestion I would have would be to go back over the starting procedure with your manual or dealer to be sure you are not leaving something out such as fast idle or priming while starting.
Yamaha's are cold natured starters the first time each day. The rest of the day you just hit the switch after they have warmed up and it is almost instant starting.
Re: Yamaha 50hp 1999 - starting with difficulty when cold
I disagree with Ray on this, I have no issues with that motor cold, as long as the enrichment circuit and proper starting method is used.
a brief overview of the "prime start" system on that 50.
it uses a heated wax pellet solinoid to alter fuel enrichment at idle .
when the pellet is cold a rod retracts and allows extra fuel to enter the intake tracts of all 3 carbs, the pellet is heated by the pick off voltage from the stator.
if the carb shutters are not properly sycnded or another issue is happening or your using any amount of warm up lever it will be very difficult to start cold.
the system actually works quite well but kicks many a techs rump cause they dont seem to grasp how it works.
as the engine runs and the pellet gets heated the rod extends and closes off the fuel enrichment passage.
on the middle carb there should be a red lever, make sure it has not been turned to the OFF position.
go on the yamaha parts website and look at the middle carb, you will see some diaphrams and orings and such that can go bad or get trash in them, those parts get overlook and are not part of the carb kit. I complained again today at the seminar about it.
but if everything is set up properly and the correct starting procedure is used those motors start fairly easy down to about 35 degrees F.
below that and I usually have to use the manual overide.
Re: Yamaha 50hp 1999 - starting with difficulty when cold
rodbolt, we are not disagreeing. Many of these motors are used in our area when it is below freezing and the local dealer may have to recomend the manual method of priming rather than the automatic version. All Yamaha's can suffer from hard starting when used under winter conditions here. I certainly see where you are coming from on the prime circuit problem as far as the parts that are included in the kits.
If the parts aren't included in the kits most techs assume they are not necessary to change.
Re: Yamaha 50hp 1999 - starting with difficulty when cold
Ray, I agree with you on them dang ducky hunters. they want to go at 20*F.
and yes most all of them have to pop the hood and do a Urgency position start.
but I guess is my biggest beef is to many so called techs, some I went to school with, cannot tell you what does what nor why when the carb is apart on the bench and I walk up and ask what does that hole do?/
so I guess the only thing we are in disagreement is how cold is cold.
I have seen some EFI motors here that have to have one or two restarts at 25*'s.
Re: Yamaha 50hp 1999 - starting with difficulty when cold
I consider anything below 50 cold myself, but the duck hunters or sauger fishermen around here sem to think that if it is not below freezing, it is too warm to go.
Re: Yamaha 50hp 1999 - starting with difficulty when cold
and I figgue below 60 and its hibernation time.
but on a prime start in line motor, any throttle advancement at cold start or any linkage misajustment will defeat the system and make cold starts difficult to impossible.
we also have the odd motor that the rod quits extending, just replaced a solinoid on a 4 week old 50 HP.
Yamaha 50hp 1999 - starting with difficulty when cold
Linear Mode
