1975 johnson intermittent starting problem

matt88

Petty Officer 2nd Class
Joined
Mar 17, 2009
Messages
160
I have had a hard time trying to get this thing to run right this year. First it was overheating so I replaced the impeller. was still overheating so I put a thermostat in it. Now its not overheating but now it will run perfect at home on the hose but when I took it to the lake yesterday it quit running right off the trailer:confused:. I pulled the pull start maybe 15 times and it finally fired again. Went down the lake about 1/2 mile and it sputters and dies again. I sprayed some 2 cycle carb cleaning spray in where the fuel hose connects to the carb and it run fine the rest of the day at wot but wants to sputter and die when I try to idle it. My first instinct is that there is some junk in the carb bowl but I have cleaned the carb out so many times I want to be sure this time before I do it again. It does have a new fuel filter and it is before the fuel pump(if that matters) and the plugs looked dry while it was acting up. Anyone experienced this??? thanks
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 1975 johnson intermittent starting problem

you have been here long enough to know to state your horse power. 1975 WHAT???
have you totally cleaned the carb, removing the jets, and using a rebuild kit? if not i recommend it. read ethanol, carb cleaning, and carb adjusting. http://forums.iboats.com/showthread.php?t=299680
 

cougar1985

Lieutenant Junior Grade
Joined
Oct 7, 2005
Messages
1,023
Re: 1975 johnson intermittent starting problem

hey!i had one of those 1975 WHATS,S ,good motors.after your carb cleaning again dont neglect to look at the fuel pump also and believe me it can happen ,look closely at the coils or coil and look for any hairline cracks,you,d be amazed at what they can do to a motor and give fits to the unsuspecting .
 

matt88

Petty Officer 2nd Class
Joined
Mar 17, 2009
Messages
160
Re: 1975 johnson intermittent starting problem

ha ha ha ok you got me on that one! I was asking the psychics in the room,lol. 1975 9.9 johnson with the 15hp carb,new impeller,new plugs,carb thoroughly cleaned but no kit installed and I am getting spark while this is happening. Both of my coils do in fact have small cracks in them? maybe thats it!
 
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