Is there always a "pilot" hole (Pee hole) on 9.9 HP 2 cycle engines?

[Jerry_NJ]

First I will mention I have a 9.9 Evinrude and I got much good help here on an electronic ignition problem a couple of years back.. and I know where the cooling water intakes are and where the pilot hole is on that engine, and on the Johnson before that, but...

I now have a Yamaha and, about 1995, 9.9 HP and I can't find either, and there is not cooling verification stream when the engine is ran in running position (at the lake). I posted this issue on the Yamaha forum and while there have been over 100 viewers, there are no replies. Is my question that complicated in your (OMC, better Yamaha) experience?

I got the 1998 Yamaha User Manual from the Yamaha web site and it shows the Pilot and Intake locations, but there are other differences in that year's 9.9 HP and my 9.9 HP, which I estimate to be a 1995 model.

So, if any of you can comment in general, or better specifically to the Yamaha, I'd greatly appreciate it, and if I learn something I'll map the information over to my post on the Yamaha forum.

:joyous:

 

[boobie]

Re: Is there always a "pilot" hole (Pee hole) on 9.9 HP 2 cycle engines?

Funny nobody on the Yamaha site would reply. I can't answer it either but maybe somebody on here will chime in and answer it. We have the better Techs over here.

 

[belairbrian]

Re: Is there always a "pilot" hole (Pee hole) on 9.9 HP 2 cycle engines?

I'll add that I can tell you not all engines have them. Most Force don't have pee holes. They do have a plug in the water jacket to add them. Also some small mercs didn't have them.

Pretty sure all Yamaha's have water intakes on the lower unit just below the anti-ventilation plate.

this should help identify it: Yamaha Model Number Identification

 

[belairbrian]

Re: Is there always a "pilot" hole (Pee hole) on 9.9 HP 2 cycle engines?

double post

 

[Jerry_NJ]

Re: Is there always a "pilot" hole (Pee hole) on 9.9 HP 2 cycle engines?

Thanks, this is more like it !! Someone replying with helpful input even if I am taking about a foreign engine. I took another closer look today and there is what I'd guess is a single water intake under the anti-cavitation plane (if that is the right name). I is large enough to handle the volume of water needed for a 9.9 HP I will guess, but it would not work with the garden hose earmuffs for running the engine out of water.

One test I made at the lake was I took the cowling off and ran the engine for about 10 minutes (60 degree cloudy day, lake must be in the upper 50s, or even 60s, not icy cold on the legs) to a fishing location I could use my electric motor on. I got water on my fingers and flipped some water on the engine, the drops just rand down. So I touched th engine with my fingers and call it just warm. I ran back to the launch area taking a longer route and again checked the engine for heat, still no steam when I flicked water on it, and not hot to the touch. I believe the engine was getting cooling water.

There is an unidentified hole/port about 1/16" in diameter on the lower housing about 6" below the engine chamber floor/firewall. It had some puffing when the engine was running and a little spitting of water, but not much water. Looking under the cowling (this engine looks new) there is a rubber (or plastic) hose running from the engine block to a connector "looking" down to the lower unit and it could line up with the "suspect" hole. I assume when there is a "pee hole" it is feed from the water pressure used to pump water in/out of the engine, thus the hose.

I believe it a good idea to replace the impeller simply because of age, even if the engine has no more than a few hours on it. As I posted in the Yamaha engine forum this engine came on a used boat, the owner used a 25 HP engine on and said the 9.9 basically just sat in the garage, and it looks like it. I am concerned that rubber parts, like the impeller can deteriorate over time even without use. I have read it is good to replace the impeller every two years - but I think that assumes 50 - 100 running hours per year, but I don't know this to be a fact.

Still nothing from the Yamaha community. I wil try to check something out of the library and to use the help here to determine what year the engine is.

 

[Jerry_NJ]

Re: Is there always a "pilot" hole (Pee hole) on 9.9 HP 2 cycle engines?

I update here with just a link to my post on Yamaha where I am now trying to be contributor - no one there seems to know anything about my questions, so as I learn I'll share, that's how this all works, right?

I think I found the pilot/pee hole: http://forums.iboats.com/yamaha-suz...-cycle-no-pilot-hole-water-stream-608615.html

I have not yet put it back in the water to see if any water is coming out - I can't say I really felt any obstructions when pushing a wire into the hole.