questions on carb problem... johnson seahorse

[showme219]

If the "adding" of fuel by pumping the bulb @ WOT will help determine if your motor is starving for fuel (assuming it revs when the extra boost is applied)....<br />What does it mean when the added fuel stalls the motor out ?? This happens to me when I use WD-40 or Starting fluid at idle AND WOT. <br />My UNEDUCATED guess would be that the boost fuel is using-up what little air I am getting into the combustion chamber. Is that a sign that I am getting TOO MUCH fuel ??<br />The symptoms are 1) rev's to only 40-50% of what (I think) is normal. 2) will not pull my 15' boat over 3-5 MPH. 3)Idles great, revs to "mid-range" fairly well 4) no power from 1/2 to full throttle. 5) occasionly with surge for a second, seeming to rev-up, but that is always short-lived !! lol<br /><br />also, the motor is NOW a '62 Johnson 40HP. Curiously, it was a 65 horse when I bought it ?!! Shame on me for not investigating a little more !!<br /><br />lastly, were IS the High-end fuel adjustment on this thing??

 

[JB]

Re: questions on carb problem... johnson seahorse

Howdy, Bilge Pump.<br /><br />Sounds like you have adequate mixture if adding fuel stalls the engine.<br /><br />WD-40 is no longer a good booster fluid. They used to use propane as a propellant, which made it a fine starter fluid for 2 strokes, but they have switched to CO-2, which is a killer rather than a help.<br /><br />Use a spray bottle and fuel mix.<br /><br />I assume you have checked for strong, hot spark in both cyl. If not, do so. No spark is your most likely suspect.<br /><br />If you have checked for spark, try running it on one cylinder with the other plug wire off. That will tell you if you are on one.<br /><br />Good luck.

 

[showme219]

Re: questions on carb problem... johnson seahorse

both plugs fire... lower one doesn't seem to be quite as blue and tends to be "wetter" on inspection than the top one.<br />so, my mixture appears o.k. then ? .......<br /><br />I just called the local marina, he said, from my brief description, that it sounds like a coil problem...... any comments?<br /><br />Thanks so much for the quick response !<br /><br />Steve

 

[rolmops]

Re: questions on carb problem... johnson seahorse

Hello.<br />Before you change the coils,you might want to check your points and the cables that go from your coil to the spark plugs.<br />I find it cheaper to eliminate the simple things first.

 

[rolmops]

Re: questions on carb problem... johnson seahorse

Hello again.<br />On second thought,pumping your bulb is the key to your problem.<br />This will only add fuel in case the fuel can leak past the float in your carburator and go into the system.<br />Chances are that it leaks all the time and thereby gives you a much too rich fuel mix.By pumping your bulb you make it worse and it shuts your engine down.<br />Before you act on this suggestion we might want to have it confirmed by smarter people than me.<br />The high end needle valve is on the the lower end of your carburator.It goes straight into the bowl.Have a care though,for some of these engines have a static high end ( e.g. unadjustable)

 

[JB]

Re: questions on carb problem... johnson seahorse

What you say would make a lot of sense if it had multiple carbs, Rolmops, but it has only one, feeding two cylinders. If I am wrong here, please straighten me out, BP.<br /><br />A broken or chipped reed could cause a loss of power in one cylinder, even if it had strong spark. That's why I suggested trying to run it on one. If only one cylinder is losing power, it is a lot easier to isolate the cause.<br /><br />I agree with Rolmops on switching plug wires, plugs, and even coils to see if the trouble follows a part. The 1962 40 has a dual magneto. You need to check the points (set at .020). I would just replace the condensors, they are cheap. <br /><br />Good luck.

 

[BKool68]

Re: questions on carb problem... johnson seahorse

I also think you should switch the plugs wires and coils one at a time and see if the wet plug moves. If it stays you may have a head gasket leaking water into that cylinder.

 

[showme219]

Re: questions on carb problem... johnson seahorse

You guys are great ! Now all I need is a "picture" of the parts you guys are mentioning ! ha ha !<br />My local "boat place" can get me a manual within a week or so, parts may take a little longer !<br />When I say I need a picture of the parts... spark plugs, wires, carb, and such, I recognize...! BUT condensor ? Coil ? Stator ? <br />I've pulled the top off of my '69 Johnson 25 HP and replaced the points, can I expect this to be the same ? <br />I pulled and cleaned the carb last night.....a little note for future references.. the POINTED end of the "float needle valve" goes DOWN !!!! LOL

 

[BKool68]

Re: questions on carb problem... johnson seahorse

Actually if the carb is upright the needle points up. But we normally have the carb upside down to rebuild.