1983 115 Johnson V4

[RiverMan]

Hi!<br /> I changed spark plugs and wires 4 months ago, but today when I was cleaning them I found that one of the plugs still new. Means not fire on that cylinder..? I disconect the coil and took it to a marine place where they told me that was working fine. My rpm only reaching up to 2500, normally goes up to 4000rpm. Last time that I used was fine... (2 months ago) Also, I will like to ask why I can't start the boat on neutral. I had to put the trotle on forward and hold the key down. It will start and run, but is a pain...I will like to fix this problem too! Any suggestions will be appreciated....RiverMan<br /> (Boat=19' Bayliner trophy)

 

[petryshyn]

Re: 1983 115 Johnson V4

Hi billc<br />It sounds like you have a dead cylinder. <br />You have to check the engine for spark as a unit. The coil may be good, but other components are just as critical. Check for spark at all cylinders.<br />If you have spark to all cylinders, you may have a fuel issue. Does it run better with the key pushed in? If so, you may have a fuel problem, carb, pump, etc.<br /><br />Don't rule out compression either....

 

[Kuni]

Re: 1983 115 Johnson V4

YOU NEED TO HAVE YOUR IGNITION SYSTEM OUTPUT TESTED IF YOU DO NOT HAVE SPARK ON THAT CYLINDER TO DETERMINE WEATHER IT IS A CDI OR TRIGGER FAULT IT WOULD PAY TO TAKE YOUR BOAT TO A SHOP TO HAVE THIS DONE BUT MAKE SURE YOU RESEARCH 1ST BECAUSE YOU MAY FIND IT EXPENSIVE IF THEY SPECIALISE IN PART CHANGING REPAIRS<br />A GOOD SHOP WILL USE A PEAK VOLTAGE METER TO DETERMINE THE STATE OF YOUR IGNITION SYSTEM<br />GOOD LUCK!

 

[Kuni]

Re: 1983 115 Johnson V4

ME AGAIN I JUST NOTICED YOU SAY YOU USUALLY GET 4000RPM YOU SHOULD BE GETTING ABOVE 5000RPM ON THIS ENGINE.<br />YOU MAY NEED TO LOOK AT DROPPING A PROP SIZE TO PICK UP YOUR RPM ,LOW RPM MEANS YOUR ENGINE IS HAVING TO WORK TO HARD,THIS MAY IN TIME LEAD TO ENGINE FAILURE.<br />IM PROBABLY FREAKIN YOU OUT NOW,BUT DON,T WORRY TALK TO A BOAT MECHANIC,PREFERABLY A JOHNSON DEALER.

 

[clanton]

Re: 1983 115 Johnson V4

If you take it to a shop try Gary at outboard repair on Pondella Road, 941-997-9880.

 

[RiverMan]

Re: 1983 115 Johnson V4

Well, today I checked for compression on all cylinders: 120,125(2) and 130. However, I readjusted plug wires and clean carb. After all, boat start fine and I throttle on low speed for 1 hour(because of the speed regulations/manatees),until I got to the main river and increase throttle to maximun speed and RPM only up 3200 and not much speed. I spent aprox. 3 hours on water. The boat never quit, but still not speed. Some of my friends think that maybe is the powerpack going bad. I thinking of taking the powerpack to a marine place and ask them to check it. I am trying to save some dollars. Thanks for the info on Gary on Pondella rd ...NFM...I personally know him... and thanks to everyone for your comments.