Yamaha Prime start lever position

[stejondeb]

I have been reading posts on the Yamaha Prime start switch and everyone references 3 positions. "Open" "Normal" and "Closed" I have a 50hp 2004 yamaha 2 stroke on my pontoon boat and my Prime starts switch only shows "OPen" and "Closed" Here is a picture of the switch. Is this in the correct position??
Thanks
Bill in Clermont Fl.

 

[robert graham]

Re: Yamaha Prime start lever position

That prime start lever is a bit confusing to me also, but I've never had to use mine since my prime start has always worked fine. I went and checked the prime start lever on my 90HP Yamaha and to put it as simple as I know how, the red lever is in the most counter-clockwise position where it stops on a pin,that must be the normal position, with the open and closed positions being by turning the lever clockwise. Hope this helps!

 

[robert graham]

Re: Yamaha Prime start lever position

Looking at your photograph, it looks like you need to turn your lever one more click counterclockwise until it stops on that pin. I just don't think this lever is a very good design, at least not to me. Good Luck!

 

[99yam40]

Re: Yamaha Prime start lever position

The carb silencer(cover) should have a diagram on it showing all 3 positions. full counterclockwise should be correct for normal like Robert said, but it looks like yours is in the closed position in the pic

 

[stejondeb]

Re: Yamaha Prime start lever position

This all started with a low speed miss, and a hesitation every once in a while on acceleration so I rebuilt all 3 carbs and all of a sudden I had a "spit" and it would spit and quit. I resealed carbs to manifold but spit still persisted. I moved the "Red" lever to a position about 1/8 inch from full counter clockwise and spit went away. There is a small indent where I put It. I have the manual but it never said anything about where it should be placed. I will check the carb cover tomorrow in the daylight as I never thought to look there because it was removed while all this was going on.
Thanks for all you help. When I put boat back in water I will get a better chance to see how it performs.

 

[99yam40]

Re: Yamaha Prime start lever position

Make sure you do the sync and link like the manual calls for anytime after reinstalling the carbs

 

[stejondeb]

Re: Yamaha Prime start lever position

Thanks I did it just as stated in manual. Boat ran great with lever in the
"OPen" position, started right up ran like a top. So I left it open, I dont know if leaving in open position will affect gas consumption, any thoughts??

 

[99yam40]

Re: Yamaha Prime start lever position

If it will not run properly in the normal position the carbs need to be pulled and cleaned. Some thing is plugged up.
If I turn mine to open it will not even run because there is too much fuel hitting the cylinders from the emergency circuit and from the regular carb circuits.