1999 Johnson 175hp Ocean Pro Stalling out

[charjenk]

When I go to full throttle my motor starts to choke and die. But if I don't hammer the throtle and kindly, gently forward the throttle, It will take off and run like without any problems. It idles smooth and runs pretty good at wot. As a matter of fact, I ran it at wot and it got my boat to excelant speeds. The problem is my boat sat for a while due to Hurricane Katrina. As I run more fuel through it, the problem does seem to be getting better.

Is there anything I can get, that i can add to my gas that might clear this problem up? Don't want to spend an arm and a leg right now. But don't want to do anything unsafe either.

One real weird thing to that i noticed. When I try to load it up on my trailer. You have to drive the boat up the trailer with the motor. It will want to stall out and it practically does but if i switch it back to neutral. It sounds as if the starter engages and recranks the motor. Anybody else experience this?

Thanks to all responses.

 

[charjenk]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

bump

 

[dsinger]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

Sounds like gummed up carbs you might try some sea foam or Deep Crep as for the starter problem have no clue but I bet someone else will. How long did it set sincel you last started it..

 

[charjenk]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

Basically, it sat from July of 2005 to approx. May of 2006. From July to May, it sat with a 1/2 a tank of gas. 35 gallons. Filled it up for that run in May. Took the boat out again this week and run the hell out of it. I'm thinking about trying the sea foam. The boat is still very drivable but I don't like this condition at all.

The reason the boat sat was because I used to work for a generator rental company. I basically had no life other than work since hurricane Katrina. I had to quit the job just to get my life back. Working 16 hours days for 6 months straight sucked.

The starter issue has me stumped. It's just weird.

thanks for the help.

 

[charjenk]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

Damn thing starts with just a touch of the key. What a tease. I'm Ready to go 20 miles out with her in the gulf of mexico. I Just don't want no problems. I really don't think i'm going to have a problem. I just think it might be time to start thinking about cleaning my carbeurators. I'm just so happy that i didn't buy a ficht motor. I came so close to doing it too. It's just that at the time gas was .99 cent a gallon. This motor seems to be rock solid. It may burn a little more gas than some of the newer motors but i trust it a hell of alot more. It damn near seems indestructible with what I've put it through.

Well, the Tarpon rodeo is next weekend and my boat is going hell or high water will not stop it now. Took it out a couple of days ago. I ran 24 gallons of gas through her and the boat seemed to start doing a little better. Well, in the next couple of days I will be running 150 gallons through her. Hopefully, the problem will clear up.
I'm thinking about running some sea foam in her to help clean things up. Any opinions about this stuff?

 

[Seasport]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

Have you noticed that this problem only happens once the motor has been run a while then sits a while - i.e. it doesn't happen from cold starts? A few people with these V6 loopers have reported this problem.

These motors need to be set up right otherwise they have a tendency to die as you open the throttle. Could be gummed up carbs but possibly a link and sync problem. It's important that the ignition timing is advanced smoothly as the throttle is opened.

One thing you should check is that the timing plate is rotating freely. This motor uses the OIS optical ignition system. The timing plate is mounted on top of the flywheel under a plastic cover. The optical timing sensor is attached to a rotating plate which rotates in a plastic track. Take off this cover and operate the throttle linkage by hand and check that the plate rotates freely and returns to stop position smoothly under spring tension.

I had a sticky plate on my motor and fixed this myself using fine valve grinding paste. I lapped the two surfaces into each other until the plate rotated freely (with some grease to lubricate).

Another possible cause is idle mixture screws set too lean.

The service manual details how to check the link and sync. It's not hard you just need to follow the steps.

Your issue with the starter motor engaging as you're putting the boat on the trailer sounds wierd. I doubt whether the starter motor is engaging (unless you have some big wiring problems.) Maybe a sticky timing plate could cause the motor to behave like this if the timing jumps quickly when you move the throttle lever back to neutral position.

 

[charjenk]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

Figured out the starter engaging issue. It was coming from my ignition switch. The key switch was not switching back from the crank position to run position on the switch so if the motor died and I put it in neutral, it would immediately crank again.

I burned another 100 gallons of gas in her and the stalling problem seems to be getting better. Doesn't do it as often, but at idle it does cough a little. I plan to change my plugs next and see what happens. I'l check that link and sync as well.

I have a couple of other questions. How often should you run an outboard to keep carbs in check? Any recommendations on the amount of fuel to burn. Also If anyone knows, just how many hours will a 2 stroke last? Curious about that one. Could find absolutely no info on that topic.

Which service manual should i get as well? Any recommendations.

Thanks

 

[charjenk]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

Another question. Am i potentially damaging my motor running it like this? Can I pull spark plugs and tell if my motor has been running lean? The motor seems to run great when you give it some gas. It just coughs on idle.
What will my spark plugs look like if they have been running lean?

Thanks

 

[xtraham]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

lean condition will destroy a engine, plugs should be all uniform tan color, and yes run some seafoam and do a decarb, buy a oe manual. good luck

 

[Seasport]

Re: 1999 Johnson 175hp Ocean Pro Stalling out

I run my motor about once a month over winter and haven't had a problem so far with gummed up carbs. I usually just run it for a few minutes on the muffs. It doesn't really get cold enough here to go through the whole winterising thing.

How long these motors last depends to a great extent on how they are used and looked after. People running commercial operations, where the motor is used every day, have reported several thousands of hours of use whereas some motors need to be rebuilt after a few hundred.