87' 225 Johnson Rough Idle And Loss of Power

[daselbee]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Dehyd...just for discussion, how can he be getting too much fuel? Only way I know is if the primer red lever is in manual mode.
I doubt all six carbs could develop the same fault to introduce too much fuel.

If something dislodged when he decarbed, he would have a fuel blockage. If a float was sticking open, it would likely be only one cyl, and would one cyl caause such a dramatic loss of power? I dunno.....

What is your theory on too much fuel?

 

[Blake0912]

Re: 87' 225 Johnson Rough Idle And Loss of Power

I think he means the fuel I'm running has to much oil causing it to bog out , and possibly fouled a plug or two in the process.
Also my fuel pump (VRO fuel side only pump ) is new so that should not be causing an issue.

 

[Blake0912]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Another thought , on the pic I posted above there's fuel leaking out of the middle left carb Throught , I assume it's either the needle not seating or a bad gasket but could this be causing that cylinder to run lean ? It only starts leaking a little fuel from the carb after the engines warned up. Not when priming and it has a white tint to it almost milky but the gas in the carb bowls are good ( no water )

 

[dehydrated]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Just a shot in the dark, hard to work on from here,but the fact that all the cylinders are dark and oily could be its not firing in time, or the jets are too big, hogged out, not enough Air ,or too much fuel .Just trying to help a simple test would be to do a take off with air box off. Question for Blake is your primmer lever in the down position after your decarb? this could do it too.

 

[Blake0912]

Re: 87' 225 Johnson Rough Idle And Loss of Power

I have not checked the primer lever , but Ive never touched it. Will running a shock treatment of sea foam cause the primer lever to trip itself?

 

[daselbee]

Re: 87' 225 Johnson Rough Idle And Loss of Power

I have not checked the primer lever , but Ive never touched it. Will running a shock treatment of sea foam cause the primer lever to trip itself?

Nope. Check it anyway. Set it in line with the black primer solenoid body.

Dehyd....yes, it is difficult to diag from a distance. Just wondering what you might be thinking.

 

[daselbee]

Re: 87' 225 Johnson Rough Idle And Loss of Power

That fuel on the front of #4 carb is milky because it is picking up moisture from the air. When it is running, try covering one carb with your hand. Cover it completely til gas runs out the front. It will probably be milky.

But, there probably should not be gas there. Is it really pouring out, or is it just seeping there? If pouring out, it could cause your symptoms.

I would like you to do a test. Next time in water, when you advance to full throttle and it is bogging, press the key in. If it picks up, it is lean. If it bogs more, it is rich. Lean will be caused by dirty carbs, maybe something was dislodged by the seafoam in the gas.

If it picks up, continue to press the key as needed and see if it will get on up to normal WOT RPM. If so, clean throttle body.

 

[Blake0912]

Re: 87' 225 Johnson Rough Idle And Loss of Power

It's seeping while idling but I'm sure it will come out faster if I run the motor at a higher RPM , I noticed when I pulled the air box off there was fuel in the bottom of it , I assume from this carb seeping fuel. I order a gasket kit and new needle/seat for it hoping that will fix my issues.
Also the gasket on the air box is torn on the bottom left corner , the corner is actually missing. Could this be letting to much air into the air box or does that gasket not really matter much?

Now that I think about if that primer switch could have been acidently moved out of place while the fly wheel was being removed / installed. Most likely not but I'll check it out.


I'll give that test a try this weekend. Im going to rebuild the carbs before I put it back in the water anyways so it may fix the problem.

 

[dehydrated]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Just a note when you install the float bowls be sure not to overtighten the screws putting the chambers back on they tend to warp if overtorqued so just firm is good .The air gasket is not your problem but should be replaced

 

[Blake0912]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Okay I figured it would need to be replaced but I'm going to make sure the motors running correct before I spend more money.
I had a thought. I just added a fuel line from my main tank to feed my kicker. I added it from the extra "outlet" side of my water seperator and it has its own primer bulb. Could this be introducing air into my mains fuel system from the kicker line? I figured since it was coming from the water seperator and had its own primer bulb it would not interfer with my main motors fuel supply. But could this be causing a problem also?
Before the kicker had its own small tank but since I went to pre mix on the main i figured i could just run it off my main fuel tank and not have to carry an extra tank around. Any thoughts ?

 

[j_k_bisson]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Yep!

there is your problem. Need to add a ball valve to the kicker line or a check valve. Don't know of a check valve that handle that low of pressure though

 

[Blake0912]

Re: 87' 225 Johnson Rough Idle And Loss of Power

thanks for your reply. I actually added a brass ball valve but it was open the whole time Ive been having issues , Ill try it with the valve closed.

 

[Blake0912]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Well I got the motor running great again. What I did was rebuild all six carbs , new plugs , made sure my kicker motors fuel line was shut off and it ran perfect , I ran around for about an hour at 4500 RPM and had no issues. I think the main problem was that the main was sucking air in threw the kickers fuel line. But the carb rebuild did help the idle and it had no hesitation what I went to plane up like it did before. Thanks for everyones help.

one more question. What is the best cruising RPMS for these engines?

 

[dehydrated]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Glad to hear sometimes its the easy things that get overlooked, my motor likes to run about 6700 rpms cruising but that might just be me lol

 

[daselbee]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Well, I'll be.....whatever'ed. I just cannot believe it was carbs. And I have my doubts on the air leak. But, i guess it was.

If you have the inclination, seeing as how you already have the ball valve in place....open that sucker up again, and see if it re-creates the problem. I just cannot see how adding air in the fuel can cause the unburned oil dripping from your exhaust that you described as a problem.

Weird.

 

[j_k_bisson]

Re: 87' 225 Johnson Rough Idle And Loss of Power

One more question. What is the best cruising RPMS for these engines?

Off! The most economical setting for these motors.

Actually it is at the start of the power band. Around 3200 RPMS. Anything high and it's just sucking the money from your pockets! But hell if you like to go fast and have very deep pockets, the best RPMS these motors run at is FULL THROTTLE. It's a 2 stroke. Anything less and your building carbon!lol

 

[Blake0912]

Re: 87' 225 Johnson Rough Idle And Loss of Power

Daselbee , i thought the same thing but after this last day of use there was no oil coming out of the exhaust. I was thinking maybe it was junk still coming out of the exhaust from the de carb? But my 9.9 Johnson kicker is still spewing Burt oil/gas from the prop even after I ran it on an aux tank with a good mix of 50:1 gas but I'll start another thread on that motor.


I did have one small issue I forgot to mention. The motor will die when I'm ideling in reverse unless I give it gas but in forward gear it's fine and this is after the motors warned up.