67 evinrude fisherman wot problems

[rasteele]

This motor starts on the first pull every time, no choke
when I first got it I had to pull the choke to start it every time, hot or cold. I pulled the flywheel and set the points to .20 and now it starts and idles perfect but there is no top end like it is miss firing. the main reason I did the points is because one of the times I took the boat out it screamed like never before and almost got up on plane. that only lasted on that outing. it has never done it since, 3 outings later and a little tinkering and I cant get it to wot awesome like that again. I know it has more potential but I cant figure it out, thanks for any help

 

[kbait]

Do a cylinder drop test. High idle in barrel or lake in neutral. Pull top plug wire when engine is running. Should keep running, but less rpms. If it completely dies, then bottom cylinder isn't firing, if there's no change, then top cylinder isn't firing. Check spark w/tester, or however you can check for 1/4" blue snappy spark in open air (you need that distance to be assured of spark across the spark plug gap under compression.. Good luck!

 

[rasteele]

Ok, did the drop test, when I pulled top wire there was a noticeable drop but stayed running, when I pulled bottom(after putting top back on) there was a change but not allot. Checked spark and bottom is a bright blue jumping an easy half inch, top one was erratic and mostly Orange and sort of grayish with a blue every once in a while and still made a decent jump, not as far as the other one and it didn't seem focused like the other either. There's only about 30 minutes run time on the plugs and they are cj8's. Really want to have a good day tomorrow on the water.thanks

 

[rasteele]

Ok, did the drop test, when I pulled top wire there was a noticeable drop but stayed running, when I pulled bottom(after putting top back on) there was a change but not allot. Checked spark and bottom is a bright blue jumping an easy half inch, top one was erratic and mostly Orange and sort of grayish with a blue every once in a while and still made a decent jump, not as far as the other one and it didn't seem focused like the other either. There's only about 30 minutes run time on the plugs and they are cj8's. Really want to have a good day tomorrow on the water.thanks

 

[rasteele]

Ok, did the drop test, when I pulled top wire there was a noticeable drop but stayed running, when I pulled bottom(after putting top back on) there was a change but not allot. Checked spark and bottom is a bright blue jumping an easy half inch, top one was erratic and mostly Orange and sort of grayish with a blue every once in a while and still made a decent jump, not as far as the other one and it didn't seem focused like the other either. There's only about 30 minutes run time on the plugs and they are cj8's. Really want to have a good day tomorrow on the water.thanks

 

[rasteele]

Sorry about triple post, phone was telling it wasn't posting

 

[nwcove]

The plugs should be j6c or j4c , j8c is a bit hot and not sure what application a cj8 is for. ?

 

[rasteele]

That was the size that was in it when I bought it, would it make the issue I'm feeling with

 

[racerone]

With a working thermostat in place it should run fine with J4C plugs.-----Pull flywheel with proper puller and inspect ignition.---It will likely have 2 cracked coils or 2 new ones already.---Replace condensers.--gap points at 0.020"

 

[rasteele]

Everything under the flywheel looks (looks) to be new and shiny, coils look good, wires all good. When I set the points I did the business card thingy to make sure they were clean but I used carb cleaner instead of acetone, mistake?

 

[nwcove]

€‹just for a visual.....(the cj8 is out of a chainsaw).

 

[rasteele]

Just called Napa and advance auto and neither one had that size but autozone has 2 in stock. Think that's why previous owner got different plugs? Gonna get plugs in the morning and be on the water by 9a.m. Will post results after a good morning or bad morning regardless. Thanks

 

[rasteele]

Just got back with the boat. No real change in anything doesn't spit and sputter at full throttle but it's not any faster. Maybe I'm not gonna get anymore out of it but I know at one time for around 10 minutes run time it revved so high under load and stayed constant and the boat flew across the water. What can I check next. Someone said j4c would run right if thermostat works. I have j6c's in it now(couldn't find j4c). Would thermostat cause this? Thanks to everyone for your help

 

[rasteele]

Also, thinking back on it, when it did run at the high rpm for that ten minutes, it was run time, maybe 2-3 minutes running to move to another spot then fish for 30 minutes or so then move again but was getting late so we came in. Never ran like that again

 

[racerone]

Every thing under the flywheel " looks new " but perform this simple test.---Force the ignition to jump a gap of 1/4" or more.---Report those results , will it do that yes or no.

 

[rasteele]

When you say jump a 1/4 inch gap you mean with the spark plug out and grounded to the block? Yes the spark jumps to the block half inch or more

 

[rasteele]

I know information is key, so, also when it ran really good that one time the throttle response was awesome too, now it seems to throttle up sort of slow from idle, don't know if that helps with diagnoses, thanks

 

[F_R]

That symptom of intermittent come & go of power is classic of running on one cylinder (when it is lacking power) You are missing something in the ignition system. Plug wire arcing through where it is clamped to the mag plate comes to mind. Or no continuity in the plug wires. Unlikely that it is the thermostat or spark plugs. But J4C or J6C are the correct ones.

Could also be getting water in a cylinder, making it cut out.

 

[rasteele]

How would I be able to tell if water in the cylinder, both plugs look the same after today, just pulled thermostat and operation seems fine, opens and closes. I visually inspected wires and loosened all clamps to see if they were cutting and saw no cuts or distress

 

[rasteele]

The only thing I didn't inspect on ignition is check the wires at coil connection because the coils, points and the condensers all look new. Could there be a bad connection at coil. I don't know how they attach since it has a housing