1980 35 hp fuel not getting to cylinders

[BlueBombNut]

my 35 hp Johnson (1980) is not getting fuel to the pistons, I am waiting for my manual to arrive but hope to gain some insight while I wait. Does anyone have a fuel diagram post carb? I have rebuilt the card, new gas and new plugs. I only thumb tested for compression and with out numbers I think there is enough to draw the gas from the carbs. I will be getting a compression gauge tomorrow to verify. When I look in where the carb hooks up I can see what look like reed valves, when I hand turn the flywheel I can see them flutter just a bit. Could these be the causing my issue? better ? what are these called, they look to be part of a plate held onto the block with a phillips head screw right in the center if you look through the opening where the carb hooks up.

Much too long for a post but just wanted to give as much info as I had available.

Much appreciated.

 

[Xcusme]

Re: 1980 35 hp fuel not getting to cylinders

Reeds are seldom a problem, and yes, the reeds are what you see fluttering.

First off, do you have spark to both plugs?
Get the compression figures as a baseline.
If you have spark to both plugs, try spraying a bit of fuel mix into the carb throat and see if it runs for a few seconds. If it does run for a few seconds, it points to a fuel delivery problem at the carb.

 

[BlueBombNut]

Re: 1980 35 hp fuel not getting to cylinders

Thanks for the reply;

Here's a laugh for checking spark, Had my son turn it over while I was checking the #1 plug as I was holding the boot.... yup spark was good on that one and as I pulled my hand off I rubbed against the # 2 plug wire and yup spark there as well and I didn't need any more caffiene for the rest of the weekend

The plugs are completly dry so I am focusing on a fuel delivery up at the carb area; just too make sure I pulled the carb out again and pulled all the little plugs so I could clean and blow out everything and it looked spotless, the only part I did not take off was the what I will call the straw jets but I did blow air thru them as well as took carb cleaner and used a syringe to see if it any luquid would make it out and it did. Is it possible for the carb to be faulty it seems unlikely.... I will get the compression numbers tonight after work. -

Thanks again.

 

[BlueBombNut]

Re: 1980 35 hp fuel not getting to cylinders

Forgot;

When I spray starter fluid in it will start but dies before I can shoot more in before it dies out. So I am again certain the fuel problem is in the carb area, wondering if I should just replace the entire carb?

 

[tashasdaddy]

Re: 1980 35 hp fuel not getting to cylinders

not to long for a post, rather have all the info. did you do all this when you did the carb. especially the float setting. it is still clogged or the float is not adjusted correctly. if it will fire and has spark, sure sounds like fuel delivery.
http://forums.iboats.com/showthread.php?t=244013

 

[BlueBombNut]

Re: 1980 35 hp fuel not getting to cylinders

Excellent question here is the order in which they happended

1. did basic checks when initial problem started.

2. Spark OK plugs fouled so I cleanned plugs sprayed starting fluid in and it started but did not stay running.

3. Pulled carb cleaned with air but with out poping out cleanning plugs

4. Plugs looked wet from starting fluid so cleaned them and put carb back on sprayed starting fluid to start but did not stay.

5. Dumped gas as out of tank to get a base line checked and tightened gas lines, got new gas and new plugs (gas 50:1) Plugs Champion QL377JC4 .030 per specs found on the Internet.

6. Tested again same results

7. Pulled carb back out and re cleaned and pulled off cleaning plugs... The carb does not have any rust stains or corrosion.

8. Put carb back on and turned over but did not spray fluid into throttle body cause I was short on time and did not want to mess with pulling and cleanning the plugs.

On the To Do List

1.Get compression gauge and get readings
2. Keep asking and testing till I drop
3. punch holes in the pontoons at the deep end of the lake

 

[Xcusme]

Re: 1980 35 hp fuel not getting to cylinders

BTW, Loose the starting spray, it does NOT have any lubrication and will strip any oil from the cylinder walls, and that's not good.
Instead, use fuel mix in a spray bottle.

 

[BlueBombNut]

Re: 1980 35 hp fuel not getting to cylinders

Thanks for the suggestion will do.

 

[BlueBombNut]

Re: 1980 35 hp fuel not getting to cylinders

Question on the float The needle that closes when the float contacts it is for the gas from the fuel pump correct? I just noticed after leveling it that when the float opens it sticks for a second then drops, I thinking this is due to being dry and perhaps not level since I was holding it while inspecting it.

 

[BlueBombNut]

Re: 1980 35 hp fuel not getting to cylinders

UPDATE

I did get the motor running but it seems to be missing. It will increase in RPM on its own then miss, a puff of smoke, then will rev up to normal for 10 - 15 seconds and repeats. I adjusted the low speed idle to the best possible setting for idle. Is this comon and any ideas to fix it would be great.

I got it out on the water and beside the miss I was happy with how it started up.......... Unfortunately it will not run above idle, everytime I open the throttle no matter how gradual it chokes and dies out.

How how hard is it to time and tune this motor? is there specialy tools needed? the manual does not address the kill when throttle is open so I am just guessing to the cause.

I did check compression:

Cold cyl #1 80+ psi....... cyl #2 85+ psi

warm cyl #1 120 psi....... cyl #2 122 psi ----This seems high does this sound wrong?