Water in carb 8HP 2 stroke

[911grizzly]

title is self-explanatory. Accidentally got water in the portable tank that stalled the motor. How do I drain water out of the carb? There is no easily accessible drain bolt on the carb, and the carb is mounted in a difficult to access location on the front of the motor. Could I pull the plugs and just pump clean fuel through to the cylinders with the fuel bulb?

Suggestions? I prefer not to remove the carb since this is a near new engine.

[99yam40]

no you can not pump it thru the motor to remove water at bottom of the carb bowl.
you will need to pull the carb and take it apart.
might get rid of some of it if you pull the drain of the bowl, but it may not get it all.

Also there could be some hiding in the lines, filter, and pump

[911grizzly]

Thanks for the response. Can anyone point me to instructions or at least a parts diagram to show me how to get the carb off this motor? Late model 8 HP 2 stroke.

The carb bowl sits deep at the forward end of the motor, and if there is a drain screw there, it is inaccessible without First removing the carb.

[99yam40]

click on the red Yamaha parts tab at the top of the page and find your motor and carb for a blow up of parts.

service manual might be a good idea if you plan on working on your motor yourself

[TownsendsFJR1300]

A year and model # posted would make things a bit easier...

If there's an under cowl, see thru fuel filter, water will be sitting (and staying) until manually dumped.
Then, if you can find a drain screw (we don't exactly what engine you have), loosen it, water and fuel will come out the float bowl.

Priming the primer bulb should flush most everything out thru the carb at that point. ...


As 99Yam noted pulling the carb apart would be good as some residual water may be in there but should flush out once started..


.

[911grizzly]

Motor is a 2011 8 SMH. There is a small white plastic semi-transparent fuel filter which I think is in between the gas line (to the remote tank) and the carb (not with the motor right now). If the carb bowl has a drain screw, to repeat what I said above, it is inaccessible without removing the carb. The carb sits at the bottom of the lower casing, and no one could possibly access the bottom of it without removing it first. Pretty sure I can get the fuel filter out and dump that.

Many thanks for the suggestions. Keep them coming!

[911grizzly]

The correct model is probably MSH, not SMH. I got that model ID from the original dealer invoice (owned the motor since new), but looking at the parts diagrams it looks like all the 8 HP motors after 2006 are models MSH, so I think the invoice is in error.

The carb diagram is showing a drain screw apparently on the side of the carb bowl (# 19). I did not notice that before when looking at the motor, but will look more carefully next time I am with the motor. The diagram does not show what is on the head of that drain screw, so I am not sure what tool I will need to loosen it (assuming I can access it without carb removal, which is my preference).

[99yam40]

I do not see a 2011 2 stroke 8,
are you sure it is a 2011?
are you sure it is a 2 stoke?

[911grizzly]

It is a 2011 2 stroke. The last two stroke imported into Canada. I also have a 2011 and a 2010 9.9 2 stroke - all great engines as long as you don’t feed them water in the gas!

[99yam40]

Well I guess that is why the parts break downs here do not show it

[panasonic]

Should be a brass screw with a slot for a flat head screwdriver.

[panasonic]

65W-14992-00-00--front--250.jpg

[TownsendsFJR1300]

This carb should be close to yours (Not the exact same model)
Part #15



:

Capture.JPG

[911grizzly]

Postscript: Thanks to the help from this forum, I was able to get the motor running today, without removing the carb. Here is what I did:
First, I removed the small black rubber fuel tube and attached white plastic fuel filter from where it attaches to the fuel pump. I made sure the filter was emptied of fluid.
Next I connected the fuel hose from the tank and used the primer bulb to squirt some fuel into the tube going to the fuel pump (but now removed and open on the end otherwise connected to the fuel filter). I used a glass jar to collect the fuel pumped through, and could see a bit of water still left in the tank that was pumped out).
Next, with the aid of the parts diagram and Panasonic’s advice above to look for a brass screw, I could see the small brass screw at the bottom of the port side of the carb bowl, deep behind the forward edge of the lower cowling. It looked impossible to access, until I noticed there was a hole with a rubber plug in the front of the lower cowling. I removed the rubber plug and was able to insert a fine, slotted screwdriver at an angle through the hole, and could loosen the drain screw (about one full turn). I was careful not to loosen the drain screw all the way, lest it fall out in which case there would be no way to get it back in without removing the carb. By loosening it a bit, I could see fluid draining out of it.
Retightened the drain screw, reinstalled the fuel filter and hose, fired it up and she purred like a kitten!

By the way, the motor model # (from the label on it) is 8 SMH and the manufacture date os 05/11 - this is the last of the Yammy two strokes imported into Canada. A real collectors item.

I also have a 2011 9.9 Yammy two stroke, short shaft, I bought at the same time. It is brand new, still in the original styrofoam packing material, never had gas run through it. Reason I have not used it is that I also own a 2010 9.9 two stroke I bought used, runs like a champ.

My other two stroke (yes, I like two strokes) is the last Yammy 150 TXR imported into the USA in 2008. Another great engine I hope will outlast me.

Two strokes forever!

Thanks again for the help and advice.

[99yam40]

well that is good news.

I am not sure what kind of fuel tank you have, but none of them are able to remove all of the water from the tank through the pick up tube since the tube does not sit at a low spot.
as the tank and boat move around you will get a slug of water when everything gets just right.
draining the tank completely and then swabbing it out with a rag to get all of the water would be a good idea.