Sputtering Johnson V4 90hp - 1994

[jimmbo]

I know that when using Engine Cleaner, or Combustion Chamber Cleaner, after the stuff had sat in the Motor for a while, a Full Throttle Run either at the Lake, or on a Dyno was done to clear all the stuff out.

 

[jimmbo]

I put in new spark plugs since seafoaming.

How long after you were done the seafoam treatment, did you replace the plugs? If you replaced them, right after using the Stuff, and before you ran the Engine, that may have fouled them
Have you looked at them?

Keep in mind, these engines do not sit and purr like an Auto Engine at idle, well maybe a Car motor with a Higher Performance Cam. They burp, fart, and jump around, even when they are running perfectly.

 

[Berdink]

How long after you were done the seafoam treatment, did you replace the plugs? If you replaced them, right after using the Stuff, and before you ran the Engine, that may have fouled them
Have you looked at them?

I only replaced them a few days ago. I wanted to make sure all 'carbon' went on the old plugs. But yes, I'll check them again and upload a picture here tomorrow.

 

[Berdink]

I've got a DVA on order so I can verify all ignition parts. I just want to rule all out. I'll be doing another compression test tomorrow.
I'm kind of approaching this like a service checkup. Just checking everything. May not be needed, but I'm also ordering new spark plug wires.

 

[Berdink]

How long after yo
Keep in mind, these engines do not sit and purr like an Auto Engine at idle, well maybe a Car motor with a Higher Performance Cam. They burp, fart, and jump around, even when they are running perfectly.

.
Yeah, my 1984 Suzuki DT 75 was a 2-stroke. And my 1984 Mercury 7.5.
And this new to me motor ran how I expected it when I went to look at it and when I got it home.
It's definitely not running right since the seafoam.
.
Let's hope this last cleaning of the carburetors does it. Either way, I'm going to take it to the river next Monday.

 

[Mc Tool]

Keep in mind, these engines do not sit and purr like an Auto Engine at idle, well maybe a Car motor with a Higher Performance Cam. They burp, fart, and jump around, even when they are running perfectly.

Here is a big single banger two stroke at idle ...admittedly not really comparing apples with apples but as jimmbo says they do not idle smoothly . Imagine 2,3,4,or 6 of these cylinders together .
I had a 2000 ish yam 90hp 2 stroke outboard ( 3 cylinder) that did this ....its music to me I love 2 strokes .
https://share.google/Iz2tPE8JIiNN22RJr

 

[saltchuckmatt]

First video, which isn't the best quality, didn't sound like it was idling to fast and wasn't "popping"

Popping is the two stroke thing!

To tell the truth, sounded like it was missing.

Just my 2 cents....either way your all over it so I'm sure you will get it out of "sure will".

 

[Berdink]

I found a video I made earlier soon after the seafoam.
You can hear the sputtering throughout the video.

 

[Berdink]

Here is a big single banger two stroke at idle ...admittedly not really comparing apples with apples but as jimmbo says they do not idle smoothly . Imagine 2,3,4,or 6 of these cylinders together .
I had a 2000 ish yam 90hp 2 stroke outboard ( 3 cylinder) that did this ....its music to me I love 2 strokes .
https://share.google/Iz2tPE8JIiNN22RJr

Thanks, Yes, I had a Yamaha 80 when I was 8. Then a Suzuki RM80 until 1979, then a Husqvarna 250.

 

[Berdink]

I do appreciate all the help.
I got myself through upgrading my 65 Chevy to power steering, power disc brakes and an Automatic Transmission with the help of a classic truck forum.
.
When I was younger, with my motorcycles and vehicles, I always had my uncle, my grandpa, and my dad to help me through.

 

[saltchuckmatt]

Thanks, Yes, I had a Yamaha 80 when I was 8. Then a Suzuki RM80 until 1979, then a Husqvarna 250.

I had go carts first, mini bikes...then a yz 80 then eventually had a YZ 400 before retiring to outboards and fishing. Doing a "Raggedy Ann in the whoop-de-doos solved that!

 

[Mc Tool]

I had go carts first, mini bikes...then a yz 80 then eventually had a YZ 400 before retiring to outboards and fishing. Doing a "Raggedy Ann in the whoop-de-doos solved that!

YZ400e ,then a few IT's . I have done the raggedy ann in the whoop-de-doos ....just got the timing wrong and slammed into the uphill ....still hurts just thinkin about it

 

[Berdink]

I had go carts first, mini bikes...then a yz 80 then eventually had a YZ 400 before retiring to outboards and fishing. Doing a "Raggedy Ann in the whoop-de-doos solved that!

Hey! were COX Cars and Planes 2-Stroke? I loved the smell of their exhaust.

 

[Mc Tool]

Hey! were COX Cars and Planes 2-Stroke? I loved the smell of their exhaust.

Yep ,I had Cox motors as a kid ,a babe bee .049³" and a .020³" motors . Yes the caster oil in the alcohol fuel had a lovely smell ...stayed on your clothes and hair for days ....according to my Mum

 

[racerone]

How does it idle with some back pressure ???

 

[Berdink]

How does it idle with some back pressure ???

I had it in a 55 gallon drum cut in half one of the runs.
I'll see how it sounds with my latest cleaning and post the video here.