Is this the right part?

[putzee52]

Is the number 1 part in this picture the idle speed adjustment screw.

My 9.9 which has a 15 carb on it will not idle once it hits the lake water. It will not idle. Bought this used, so i think it may be an issue with the back pressure on the exhaust when the exhaust is submerged. I would like to turn up the ilde a bit to keep it running.

 

[HybridMX6]

Re: Is this the right part?

What year motor is it?

 

[wbeaton]

Re: Is this the right part?

Looks like a 1990's era carb. Number 1 is for adjusting the cam follower for the magneto. Don't mess with that one. Number 17 is your low speed jet. There should be a lean-rich knob on the front of the engine that slides over it. Adjust it for low idle.

I should also ask if you put the 15 hp carb on it or if it was a previous owner. Did it run fine before the modification? Is the carb clean? Does it run ok at WOT?

 

[putzee52]

Re: Is this the right part?

Previous owner had the work done at the marina. Carb was rebuilt last year. All new fuel lines, new plugs..Its a 1999. In the driveway with the hose and ear muffs on it it runs perfect. As soon as it is in the lake at the dock it will not run at low idle without adjustment. running at higher rpsm either in gear or out of gear it runs fine.
Jay

 

[tashasdaddy]

Re: Is this the right part?

that is correct, or muffs there is not any back pressure on the exhaust, in the water there is. your idle speed stop screw has to be adjusted in the water, with the motor in gear. on the 9.9, i believe it is on the port side of the motor, just below the flywheel.

 

[putzee52]

Re: Is this the right part?

So its not actually on the carburator? Is it an adjustment on the cable tension that goes to the controls?

 

[wbeaton]

Re: Is this the right part?

So its not actually on the carburator? Is it an adjustment on the cable tension that goes to the controls?

The one TD mentioned is the idle stop. That is to say where the throttle stops at idle. If you can't get it to idle at all that is usually due to the low speed (idle) air/fuel mix being out. That is when you need to set the lean/rich mix on the low speed jet. Once you get it to idle set the idle stop. I like to set the idle stop as low as I can.

 

[putzee52]

Re: Is this the right part?

Its very finiky. Usually once i get it to idle at home, take it to the lake it wont idle unless i adjust the mix screw ever so slightly. I acutally just replaced the mix needle valve and spring thinkings they were worn. Each time i take the boat out ill need to make and adjustment. I figure with everthing else in the green the idle speed is all that is left.

I think the motor just wants love.

 

[wbeaton]

Re: Is this the right part?

I think the motor just wants love.

Don't we all.

If your idle stop is set too low it won't idle either. It'll keep stalling unless you play with the jet. Keep at it. You'll find the best setting.

I should also mention, I've found on the few motors I've run so far this year that I've had to tweek the jets. I don't know if its the cool weather, quality difference in this years spring fuel vs last summers or something completely different, but everyone needed adjustment.

The motors I've run so far are as follows:

1953 Evinrude 15 hp
1954 Evinrude 7.5 hp
1957 Johnson 10 hp
1972 Johnson 6 hp
1988 Johnson 30 hp

I've run a few others, but they were all repaired over winter and required carb setup anyway so I guess they don't count.

 

[putzee52]

Re: Is this the right part?

Why would it idle out of the water perfectly? I will also add that once i adjust the needle valve for the lake that day it runs fine for the rest of the time on the lake then trailer home, sit for a bit, trailer back and repeat the adjustment process.

 

[putzee52]

Re: Is this the right part?

So i did some more digging. On the starboard side i found no idle adjuster. I did find a torx head screw in the bottom of the engine compartment. Looks like a needle valve. Appears to have come from near the freeze plug but cant get to it. Any ideas what it could be. Ill post pics later