NEED HELP HERE....

F

funstick

Recruit
Joined
Sep 4, 2005
Messages
2
I'm new to the board but have researched many many posts here to try to find my problem but I can't narrow down a solution. So here it goes....<br /><br />I have a 1983 75hp Johnson that has trouble starting. I have replaced all coils, rectifier, power-pack and rebuilt the carbs (didn't soak them just blew them out and replaced needle, seat and float). I have spark with a gap of 7/16. It takes a lot to get the motor started. Oh I even set the timing. Once I get the motor started, it stays started but as soon as I shut it off for more than 5 mins or so it difficult to start up again. I have to use the primer and even more so I have to manually use the primer. It's only on start up when I have my problem. I did do a compression check on all three cylinders and all over 100 psi and within 5-8 psi from eachother.<br /><br />Any suggestions? I believe I have a carb problem but the rebuild kit didn't have many part to replace with (It appears it was a rebuild kit that included a few different carbs). Should I soak the carbs in a solution and if so what solution?<br /><br />R/<br />Mike
 
W

Walker

Captain
Joined
Jun 15, 2002
Messages
3,085
Re: NEED HELP HERE....

Soaking the acrbs might be a good idea, but first describe in detail step by step your starting procedure.<br />Also, because it sounds like you might be losing your prime, pump the bulb up hard and let it sit for 10 minutes or so. Is the bulb still hard.
 
F

funstick

Recruit
Joined
Sep 4, 2005
Messages
2
Re: NEED HELP HERE....

LCDR,<br /><br />I do prime the bulb everytime on start but I will go back and test that again by walking away from it a bit and see if it still stays hard. How I start the boat you ask, well I take the cover off and manually set the primer siliniod to "manual" and prime the ball. That is the usual starting method.<br /><br />R/<br />Mike
 
K

KYHunter

Petty Officer 2nd Class
Joined
Apr 14, 2005
Messages
109
Re: NEED HELP HERE....

Your bulb should stay hard longer than a few minutes. When working right, I've fished for a couple hours and fired up, bulb still hard no problem. If you do what walker said you'll know. Also why do you prime manually ? If you have a choke solenoid the key is where you should be priming it. If your choke switch doesn't work you may have a ignition switch problem .<br /> Good-Luck,<br /> KYHunter
 
P

paff813

Recruit
Joined
Nov 23, 2002
Messages
2
Re: NEED HELP HERE....

Well, I am at my wits end and finally took my boat to the BOAT Dr. to look at. One thing that didn't sit well with me from the Boat Dr. was he mentioned that the carbs may have low and mid range settings. Is that true? I could be wrong but I didn't see that in the manual.
 
M

MCM

Lieutenant Junior Grade
Joined
Jun 1, 2005
Messages
1,201
Re: NEED HELP HERE....

paff813, for best results start a new post stating year, hp, and model/serial#'s, also include what problems you are having :)
 
D

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: NEED HELP HERE....

By setting the primer solenoid to "Manual" youre opening the valve. Since you pump the bulb when the primer is open, youre pumping gas directly in the motor. Most likely flooding it. The bulb will never get hard this way. Theres nothing stopping the fuel. <br /><br />The carb bowls may or may not get filled this way either.
 
R

R.Johnson

Rear Admiral
Joined
Sep 24, 2003
Messages
4,446
Re: NEED HELP HERE....

When you overhaul a carb, the object is to make sure all circuits in that carb are back in spec. Even soaking will not always clear all of the passage's. That is the reason for the core plug's, and lead slug stops. If a carb is badly varnished, it helps to chase these passage's with a fine wire, proper size drill, or a wire guage of the proper size during the soaking process. I have taken jets out of carb's so badly clogged with varnish that no amount of soaking would completely clear. Even if you could blow air thru it, it would be undersize from the clinging varnish. Doing this on a regular basis, I use a set of wire, or pin guages held in a pin vice for this job. This will allow you to clean the passage with out damage, such as inlarging the hole. I realize for the home mechanic, you don't want to invest in a set of these guages. You can buy spring, or (music wire) from a business here is Iowa called Brownells, they have this wire in a pack, 18 diameters, from .016 to .048. They are 8" long, and cost about $10.00. I bought a pack of this at least 20 years ago, and still have'nt used it up. On your carb's, I would look for a clogged low speed circuit. Sorry for the long post, and I hope I have'nt gone off at a tangent here.
 
S

surlyjoe

Chief Petty Officer
Joined
Nov 21, 2005
Messages
486
Re: NEED HELP HERE....

if yoou do take the carb back apart, soaking in "chem-dip" wiil be sure to get all the crud out. course it smells like something died in the can, but it is very effective and what the carb rebuilders use to prep for remanufacture.
 
M

MCM

Lieutenant Junior Grade
Joined
Jun 1, 2005
Messages
1,201
Re: NEED HELP HERE....

Am I the only one that has realized this is an old post (probably solved) used to post a new problem concerning an as yet unknown motor?
 
S

Seasport

Chief Petty Officer
Joined
May 2, 2005
Messages
410
Re: NEED HELP HERE....

Yep - probably so MCM :) Easy to miss this isn't it.
 
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