76 JOHNSON 35HP 15ft high speed problems

[400hphemi]

I have the above motor i have rebuilt the carb fuel pump set the points and clean them. it was rebuilt right before i got it and it does have fire to both of the plugs what it's doing is at (wot) it doesnt bog or anything its just not reving all the way up. the carb is opening all the way up it ran a hell of alot better than the first time out but i no it's not at it's full potential it cranks right up cold or warm.what im not sure about is the timing i dont have a timing light so what i did is pull the top spark plug out and on it's c/p stroke right before (tdc) 1/8 of an inch thats around where im at and thats where i set the fly wheel the adjustment for the timing base under the fly wheel i think it's between there and the adjustment for the carb the only adjustment screw for the carb is that top one right?

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

oh and it will start on the top plug but not the bottem an the arm thats moves the plate under the flywheel is i adjust that screw real far out i get spark on the bottem somebody help me i done put over 300$ in this boat and nothing would it spark a lilbit if a condencer was bad help somebody it's my first boat an i want to go riding faster then 10-12mph

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

oh well thanks anyway il just **** can it

 

[CATransplant]

Re: 76 JOHNSON 35HP 15ft high speed problems

You could do that. Or, you could wait until someone comes along who has an answer for you.

When you worked on the ignition and timing, did you use the factory manual to help you do the link and sync that's needed to get things just right? How did you "set the points," exactly?

Also, exactly what things have you done to the engine? It's really hard to tell from your posts. That confusion may have stopped folks from responding to your questions.

I'm still unclear about whether it has spark on both cylinders, frankly. Sometimes it does and sometimes it doesn't? Is that about right?

So, explain what work you have done, whether you have the manual, and any other information you might have. Someone familiar with that model will probably be able to help.

All answers here are done by unpaid volunteers who visit this site. It sometimes takes a bit of time to get the information you need. The other answer is to take the outboard down to a shop and let them fix it, but if you're annoyed about spending $300, you'll be a lot more annoyed by what the shop will charge.

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

do i have a manual no I pulled the fly off the then i turn the crank intill the points would open set them both to .20 they shut good open at one at a time an all....now how i went about setting timing is on it c/p stroke 1/8 of a inch from (tdc) on the top plug...

things that have been done to the motor motor rebuild,fuel pump,carb rebuild ,1 new coil plugs champion uh fuel lines good no air leaks...

the spark it has spark to both in (N) but when i put in gear it would loose bottem spark so i adjusted the that nob that goes to the thing where the points are an i picked up spark but still wont go (wot) underload...

should i set the timing by the fly wheel to (tdc) or is it right how i have it?

is there a slow speed on here for if the motor gets to hot?
which it's not i can hold my hand on the motor after 30mins of runnin

gas an all is mix to a 50to1 ratio with new gas

i just really dont know what to do it starts right up first hit it just cant take that load??? sorry about confusion i get goin a lil to fast to some times..

 

[CATransplant]

Re: 76 JOHNSON 35HP 15ft high speed problems

"the spark it has spark to both in (N) but when i put in gear it would loose bottem spark so i adjusted the that nob that goes to the thing where the points are an i picked up spark but still wont go (wot) underload... "

There's your key. I don't have your model, nor have I worked on one, so I can't give you specifics. Something is changing when you operate the shift lever. Find out what and you'll find your problem. It sounds like you're running on one cylinder while in gear, which would account for the poor performance. So, operate the shift lever, with the engine off, and see what moves. Somewhere, something's shorting out and killing the bottom cylinder. Like I said, I don't know that particular engine, so that's about all the help I can give.

I see that you had two other threads on this outboard. It's best to keep all your questions in one thread until you get the problem solved. That way, the people who were trying to help you will be able to find your threads. By starting a new thread, all the information from the other threads is lost, unless someone takes the time to hunt down your other threads. Trust me...not many here will bother.

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

update i took it to the river today it ran just like it should then it started to pop an miss then i was back at 10mph..i dont have a battery or anything it does have the hook up tho..

right before it started to miss i grab the wires on it an move them around an it would cut in then right back out what wires should i be studing the most on it?

but yea other then that i had fun the 5 mins it did work after 1year of messing with her so any help would be appreciated...

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

the model number is 35e76g 1976... thanks for your help

 

[steelespike]

Re: 76 JOHNSON 35HP 15ft high speed problems

You may have a plug wire shorting look for a rubbed spot or cracks.Could be corrosion where wires go in the coils.If the wires are old replace them.
Solid core wire kits are available here. or at NAPA.Some branches aren't aware of their 300 page marine products catalog.

 

[CATransplant]

Re: 76 JOHNSON 35HP 15ft high speed problems

Are you talking about the wires on the outside of the engine, or the ones under the hood?

If it's the outside ones, do they plug into the engine? If so, unplug them and see how it runs.

The most likely wires to cause this problem are the two kill switch wires. I don't know their colors on that year. If one of them grounds out to something else, that can cause one cylinder to cut out. If they touch each other, the engine will die.

You need to eliminate the possibilities, one at a time. Otherwise, you're just fiddling with the thing. If there's a plug, unplug it, then test again.

Sounds to me like you're working with a wiring nighmare here. Start eliminating possibilities...one at a time, until you find the problem.

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

Yea i think your right about the kill switch reminded me here lately i had to choke the motor for it stop cause it will run with key on or off...il give it a look

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

well i went from having runnin fine for about 10 mins (top it out) then it started to backfire and it would run full speed then cut out then run full speed then cut out today when i took it out it just ran the 10mph never even try to top out just stayed in limp mode...

the motor will run on the bottem plug not the top one BUT it does spark at the top..but it did that the other day but it ran fine for a min.this lil hose above the fuel pump did come off one time but i just put it back on no holes in it or anything..what is it for?

an i got the key switch to work.. id wiggle wires but it never ran like it should
i think this boat is making me bald to somebody help me!!!

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

have yall ever heard of a shorting switch. I was just looking at parts under its model number and noticed it. Does anyone know what its purpose is?

 

[tomh59]

Re: 76 JOHNSON 35HP 15ft high speed problems

I have a 76' 35 hp that was running great then would start skipping
and running real rough. It ended up being a faulty driver coil which
is under the flywheel.I'm no wrench but replacing it fixed my problem.

Good luck

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

well i just ordered me a IGNITION TUNE UP KIt,driver coil,spark plugs an some kind of hose thats above the fuel pump any idea what that could be

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

wish me luck when the parts get here

 

[Gary H NC]

Re: 76 JOHNSON 35HP 15ft high speed problems

The timing advance needs to be set to specs...sounds like you have it all out of adjustment.
Do yourself a HUGE favor and buy this REAL factory manual...
The after market book like Seloc and Clymers are no good.
Get your new parts AND the manual...They are very hard to find and this is a great price.
I know the seller so tell him Gary in NC sent you...

http://cgi.ebay.com/ebaymotors/1976...62QQcategoryZ26453QQihZ024QQitemZ370081375267

 

[400hphemi]

Re: 76 JOHNSON 35HP 15ft high speed problems

does anybody know what that hose is above the fuel pump it runs up under the carb to the block???i out clear hose on it an it only gets half way full with gas then it wont go anywhere else is that how its post to be