Older outboard not running right

[bostonwhalermontauk1965]

Hi

I have two questions. What would the symptoms be of a bad stator? How would the motor behave if the reeds were bad. Thanks guys - Im somewhat unfamiliar with 2 cycles. Paul

 

[freddyray21]

Re: Older outboard not running right

what motor? Year? HP. a stator can be used to generate spark or charge a battery. What is the motor doing or not doing?

 

[bostonwhalermontauk1965]

Re: Older outboard not running right

1982 Johnson 50. Developed a miss. Motor will stall out when lower plug wire is pulled. Ive tried everything. rebuilt carbs, fuel system new from tank to carb connect. New wires and plugs. Timing right on money fly wheel keyway fine. Tested igmition with timing light. Beautiful blue spark at proper time. 135 lbs of compression in both cylinders. Im out of ideas and frustrated. Motor runs much better after carb rebuild and new wires, but still big loss of power and only really running on bottom cylinder.

 

[Daviet]

Re: Older outboard not running right

Couple of thoughts, your compression is good. You checked spark with a timing light and are not loosing spark under load, correct? Does you fuel pump mount to the upper cylinder? Have you tried squirting fuel mixture into the upper carb under load to see if ti picks up?

 

[bostonwhalermontauk1965]

Re: Older outboard not running right

Squirting fuel into cylinder is my next step. Any thoughts on where to purchase a squirt bottle that wont get eaten by gas? And you brought up a good point, I guess I need to put the timing light on under way in lake and see if the spark dies out.

 

[freddyray21]

Re: Older outboard not running right

is the pump mounted to the upper cylinder? If so it can be a pin hole in the diaphragm causing too much gas to go in the cylinder.

 

[bostonwhalermontauk1965]

Re: Older outboard not running right

The fuel pump does mount to upper cylinder, yes , but it isnt leaking into cylinder. Fuel pump rebuild kit should be here tommorrow, so I will try that too, because I think the diaphram is too stretched out. Do you think the bottom carb only would function when a fuel pump runs at low pressure?

 

[bostonwhalermontauk1965]

Re: Older outboard not running right

A pin hole is unlikely because I did what a fellow on here recommended and that was to unbolt fuel pump off motor and re bolt it alone off motor and pump it up, and it dosent leak fuel into the pulse hole

 

[Daviet]

Re: Older outboard not running right

I was thinking more along the line that the pump diaphram is leaking fuel into the upper cylinder and flooding the engine. Fuel pump should pump the same pressure to both carbs at the same time.

 

[bostonwhalermontauk1965]

Re: Older outboard not running right

Well I hope your idea is correct, because then a carb rebuild will hopefully do the trick. I literally have a kit in the mail on its way - should be here tommorrow. By the end of the weekend , I will know whether or not to isolate the fuel pump as the culprit. What do bad reeds act like?

 

[Daviet]

Re: Older outboard not running right

Normally if you have bad reeds you will get spitting or popping out of the carb.

 

[bostonwhalermontauk1965]

Re: Older outboard not running right

OK - Thank you Daviet, you have been really helpfull. I will keep you posted on the progress of my nightmare mystery here. One thing is for sure, With the amount of compression that this motor has, I know it is worth the effort to try and salvage this thing and really get to the bottom of it. I also did an impellor change and I have always changed the lower gear oil. This motor is going to run amazingly well when I get to the bottom of the dead cylinder, because you guys would not believe the power it has running on just the one. My 1000 lb plus whaler is almost getting up on plane with a dead cylinder on a johnson 50. I cant wait till it is running correctly. I also installed a sierra engine side harness because my old one was corroded.

 

[boobie]

Re: Older outboard not running right

Try squirting some fuel in both carbs and see if the mtr picks up or not. If one cyl picks up, that's the one lacking fuel.

 

[bostonwhalermontauk1965]

Re: Older outboard not running right

I just rebuilt the fuel pump and noticed that the upper carb was letting too much gas past the needle and seat, so I took off the upper carb again, removed bowl, and re adjusted the float arm. After reassembling, I now notice it is no longer flooding past the needle and pouring out front, and the primer bulb gets hard as a rock with no sign of fuel now. In addition, I then removed bowl drain screw to insure that the bowl had some fuel still in it at all, and it did. This hopefully will now end this problem. Wish me luck, signed... God forbid the carb rebuild worked out right the first time, even though I took all correct steps and adjusted float level to the bowl mounting surface the first time (LOL)